Rent vs Buy Calculator: Understand the Real Cost of Housing Decisions
This calculator evaluates both the direct housing costs and the opportunity costs of each choice over time. It helps you understand not just which option is cheaper today, but which builds more financial value over your expected time horizon.
This calculator compares the total financial impact of renting versus buying a home over any time horizon you choose. It models not only the monthly costs of each option but also the long-term effects of home appreciation, rent inflation, and the opportunity cost of the capital tied up in a down payment.
Why Rent vs Buy Is One of the Most Misunderstood Financial Decisions
The most common approach to the rent vs buy decision is to compare a monthly mortgage payment to current rent. That single comparison is misleading because the two figures measure fundamentally different things. A mortgage payment covers only principal and interest. The full monthly cost of owning includes property taxes, insurance, maintenance reserves (1-3% of home value), and often HOA dues. Those additional costs typically add 30-60% to the base mortgage payment. Comparing P&I to rent is like comparing the price of a car to the cost of a bus pass. The two figures capture different packages of costs and benefits.
Ownership duration is the variable most often ignored. A buyer who stays four years faces 8-13% in round-trip transaction costs ($40,000 to $65,000 on a $500,000 home) that typically exceed any equity built in that period. A buyer who stays 15 years amortizes those same costs while benefiting from a fixed mortgage payment that becomes increasingly affordable as rent rises. The same financial inputs produce opposite conclusions depending on time horizon alone.
Flexibility also has economic value that no calculator quantifies. A homeowner who must turn down a promotion requiring relocation, or who cannot easily downsize after a job loss, incurs a real financial cost that no monthly payment comparison captures. Renters can relocate, adjust housing costs downward, or move to a lower-cost market with minimal friction. This optionality has real financial value, even if calculators do not assign it a dollar figure.
The rent vs buy problem has no universal answer. Time horizon, local market, savings, and risk tolerance all push the outcome in different directions. The calculator lets you explore tradeoffs across scenarios. The sections below provide the analytical framework to interpret its results. They remain valuable even if you never touch the calculator.
Quick Answer
Whether renting or buying is better depends on your monthly rent, home price, mortgage rate, and how long you plan to stay. In most U.S. markets, buying becomes cheaper than renting after five to seven years once equity buildup and a fixed mortgage payment offset the higher upfront costs. Enter your numbers above to find your personal break-even year.
Is it better to rent or buy a home right now?
That depends on your timeline, local market, and financial situation. Buying generally wins over five-plus years in markets where the home price is under 18 times the annual rent. Renting tends to win for shorter stays, high-price markets, or when your savings are better deployed elsewhere. The calculator above will give you a concrete answer based on your inputs.
Results are estimates based on your inputs and standard financial formulas. All assumptions are fully adjustable.
Why This Calculator Is Different
Most rent vs buy calculators miss the details that matter. Ours includes every cost that actually impacts your decision.
Exact Break-Even Analysis
Know precisely when buying beats renting for YOUR specific situation
30-Year Projection
See total costs over 5, 10, 15, 20, or 30 years side-by-side
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Your Personalized Rent vs Buy Analysis
How it works:Simply adjust the slider (or enter a desired price) to see how costs compare over time. Your break-even point is shown on the timeline.
Inputs
Adjust sliders • Advanced options optionalBuying
Renting
Estimates only. This is not financial advice. No personal data is stored.
Cost Comparison
After 7 years
Save by renting
$115,843
~$1K/mo · 30% less
Renting
Total cost over 7 years
$268,659
Buying
Net cost over 7 years
$384,502
Equity Built
$331,243
Equity & Home Value Over Time
Home Value
$799,418
Mortgage Balance
$468,175
Your Equity
$331,243
30-Year Cost Projection
Cumulative costs over time • Break-even at year 14
Which U.S. Cities Favor Renting vs Buying in 2026?
Markets with shorter break-even periods (under 5 years) generally favor buying, while cities with 10+ year break-evens favor renting.
Live data powered by Zillow Research • 100+ metros supported
| City | Median Rent | Median Price | Break-Even | Verdict | |
|---|---|---|---|---|---|
New York, NY | $3,450/mo | $785,000 | 12+ years | Rent | |
San Francisco, CA | $3,200/mo | $1.2M | 14+ years | Rent | |
Austin, TX | $1,750/mo | $445,000 | 5 years | Buy | |
Phoenix, AZ | $1,650/mo | $385,000 | 4 years | Buy | |
Miami, FL | $2,400/mo | $520,000 | 7 years | Depends | |
Denver, CO | $2,100/mo | $545,000 | 6 years | Buy | |
Seattle, WA | $2,350/mo | $750,000 | 10+ years | Rent | |
Chicago, IL | $1,850/mo | $325,000 | 4 years | Buy |
Data updated January 2026. Break-even assumes 20% down, 7% rate. Use our calculator for personalized results.
What Are the Main Differences Between Renting and Buying?
Renting offers flexibility and lower upfront costs, while buying builds equity and provides long-term stability. The table below compares key factors.
| Factor | Renting | Buying |
|---|---|---|
| Monthly Payment | Fixed (but increases) | Fixed (mortgage) |
| Equity Building | None | Yes (builds wealth) |
| Maintenance | Landlord pays | You pay (1-3%/year) |
| Tax Benefits | None | Mortgage interest deduction |
| Flexibility | High (short lease) | Low (selling takes time) |
| Appreciation | None | Yes (typically 3-4%/year) |
| Upfront Costs | 1-2 months rent | 5-20% down + closing |
| Long-term Cost | Higher (rent inflation) | Lower (fixed mortgage) |
Expert Guides & Resources
In-depth guides on the home buying and renting process.
Frequently Asked Questions
Everything you need to know about the rent vs buy decision
Common Mistakes People Make Before Using a Rent vs Buy Calculator
Many households approach the rent vs buy question with strong intuition about which option is better. That intuition is often shaped by incomplete comparisons and common misconceptions. The mistakes below lead people to the wrong conclusion more often than they realize.
Comparing Rent to Mortgage Payments Only
This is the most widespread mistake in housing decisions. A mortgage payment covers principal and interest only. The actual monthly cost of ownership includes property taxes (typically 1-2% of home value annually), homeowners insurance, maintenance reserves (1-3% of home value), and often HOA dues. These additional costs add 30-60% to the base mortgage payment. Comparing P&I to rent understates the true cost of buying by hundreds of dollars per month. A complete comparison must include all ownership costs, not just the mortgage payment.
Ignoring Selling Costs
Buyers usually account for the upfront closing costs of purchasing a home (2-5% of the price) but routinely ignore the costs of eventually selling. Real estate commissions, transfer taxes, and legal fees add 6-8% at the time of sale. The combined round-trip cost of 8-13% means a $500,000 home costs $40,000-$65,000 to buy and later sell. A buyer who sells after a few years may have built $30,000 in equity but incurred $50,000 in transaction costs, resulting in a net loss. Selling costs must be factored in from the start.
Assuming Appreciation Is Guaranteed
Home prices have appreciated at roughly 3-4% per year nationally over the long run, but individual markets and time periods vary enormously. A buyer who purchased at the peak of a housing cycle in 2006 saw prices fall 20-30% in many markets and took until 2012-2014 to recover. Even in strong markets, prices can stagnate for years. The common assumption that "home values always go up" leads buyers to project unrealistic equity growth and underestimate the risk of a flat or declining market. Run the calculator with appreciation rates as low as 0-1% to stress-test this assumption.
Ignoring Career Mobility
A promotion or better job opportunity in another city is one of the most common reasons homeowners sell earlier than planned. But the decision to accept a new job is distorted by the cost and hassle of selling a home. A homeowner who turns down a $30,000 raise because they cannot sell quickly enough has made an implicit financial decision that no calculator captures. Renters face no such friction; they can relocate for a better opportunity with minimal cost and notice. For households in careers with geographic mobility (technology, consulting, healthcare, academia), the option value of renting is significant even if the calculator shows buying as cheaper on paper.
Overestimating Time In The Home
Most households overestimate how long they will stay in a home. Surveys consistently show that homeowners expect to stay longer than they actually do. Life events (job changes, relationship changes, family growth, health issues) often force moves earlier than planned. The mistake is entering a 10-year time horizon into the calculator when the realistic horizon is closer to 5 years. Be honest about your track record. If you said "five years" for your last apartment and moved after three, account for that pattern. Running the calculator with a shorter time horizon than you hope for is the conservative and wise approach. For guidance on how time horizon changes the decision, see our 3, 5, and 10-year analysis.
Five Real-World Rent vs Buy Scenarios
These scenarios illustrate how the same basic rent vs buy framework produces different conclusions depending on market conditions, time horizon, and financial assumptions.
Moving Within Three Years
Situation: A renter paying $2,000 per month considers buying a $350,000 home with 10% down at 6.5% interest. They expect to relocate for work in three years.
Financial assumptions: 3% appreciation, 3.5% rent inflation, 1% maintenance, 1.2% property taxes, 3% closing costs, 7% selling costs, 6% alternative investment return.
Likely outcome: Renting wins by a wide margin. The buyer pays roughly $28,000 in closing costs at purchase. After three years, selling costs consume approximately $30,000. Total equity built through appreciation and principal paydown is roughly $33,000, but transaction costs total $58,000. The net loss from buying is approximately $25,000 compared to renting, even before accounting for higher monthly ownership costs. Renting preserves capital and flexibility.
Why: Three years is insufficient time for appreciation and amortization to overcome the round-trip transaction costs of buying. The break-even point in this scenario is roughly six to seven years. Selling before that point means the buyer incurs transaction costs without enough equity growth to offset them.
Staying Ten Years or Longer
Situation: A family renting at $2,500 per month considers buying a $420,000 home with 20% down at 6% interest. They plan to stay for at least ten years.
Financial assumptions: 3% appreciation, 3.5% rent inflation, 1% maintenance, 1.1% property taxes, 3% closing costs, 7% selling costs, 6% alternative return.
Likely outcome: Buying improves financially over time. By year three, the buyer is still behind due to closing costs. By year seven, the buyer's cumulative cost roughly equals the renter's. By year ten, buying is approximately $60,000 cheaper. The buyer's home has appreciated to $565,000, the mortgage balance has been paid down to $255,000, and the fixed payment is increasingly valuable as rent inflation pushes the renter's monthly cost from $2,500 to $3,525.
Why: Ten years provides enough time for appreciation, principal paydown, and the fixed-rate mortgage advantage to compound. The longer the time horizon, the more the buyer's structural advantages outweigh the upfront transaction costs.
High-Cost Housing Market
Situation: A professional earning $180,000 in the San Francisco Bay Area pays $3,400 per month in rent and considers buying a $1.2 million home with 20% down ($240,000) at 6.5% interest.
Financial assumptions: 2.5% appreciation (conservative for a high-cost market), 3.5% rent inflation, 1% maintenance, 1.2% property taxes, 3% closing costs, 7% selling costs, 6% alternative investment return.
Likely outcome: Buying requires 15+ years to break even. The down payment of $240,000 represents a significant opportunity cost. If invested at 6%, that capital grows to approximately $430,000 after ten years. The mortgage payment on $960,000 at 6.5% is $6,068 per month before taxes and insurance, roughly double the rent. Even with 2.5% appreciation, the high ownership premium and the large opportunity cost of the down payment push the break-even point well past a decade.
Why: In high-cost markets, the price-to-rent ratio often exceeds 30 (compared to a national median near 20). The combination of a large down payment, high mortgage payment relative to rent, and property taxes on a high valuation creates a large monthly ownership premium that takes many years to offset through appreciation and equity buildup. The high home prices guide examines this dynamic in more detail.
Rapid Rent Growth Market
Situation: A household renting at $1,800 per month in a fast-growing Sun Belt city considers buying a $380,000 home with 10% down at 6.5% interest. Rent in the city has been growing at 7-8% annually due to population inflows and limited construction.
Financial assumptions: 4% appreciation, 7% rent inflation, 1% maintenance, 1.0% property taxes, 3% closing costs, 7% selling costs, 6% alternative return.
Likely outcome: The break-even point accelerates to roughly four to five years. While the buyer's monthly cost starts higher ($2,695 P&I plus taxes and insurance versus $1,800 rent), rapid rent inflation quickly erodes the renter's advantage. By year five, the renter's monthly cost reaches $2,525 while the buyer's payment stays fixed. By year seven, the renter is paying $3,100 per month, and cumulative renting costs have surpassed cumulative buying costs.
Why: Rent inflation is the most underappreciated variable in the rent vs buy decision. In markets where rent is growing faster than the historical average, the fixed-rate mortgage becomes increasingly valuable. The buyer locks in their largest housing cost, while the renter faces compounding increases that make long-term renting significantly more expensive. Our timeframes guide shows how different rent growth rates shift outcomes at 3, 5, and 10 years.
Large Investment Portfolio Alternative
Situation: A household has $200,000 in liquid savings. They can either use it as a 20% down payment on a $1 million home or continue renting at $3,000 per month and invest the $200,000 in a diversified portfolio.
Financial assumptions: 3% appreciation, 3.5% rent inflation, 1% maintenance, 1.2% property taxes, 3% closing costs, 7% selling costs, 7% investment return (reflecting a stock-heavy portfolio).
Likely outcome: If the invested portfolio earns 7% annually, the $200,000 grows to roughly $393,000 after ten years, while home equity (3% appreciation on $1M less mortgage paydown) totals approximately $382,000 before selling costs. After deducting 7% selling costs ($92,000), the buyer's net equity drops to roughly $290,000, meaning the renter-plus-investor ends up ahead by approximately $103,000. The renter also has full liquidity and no maintenance obligations.
Why: When the down payment is large relative to the home price, the opportunity cost matters more. A high-return investment alternative can outpace home equity, especially after accounting for selling costs. This scenario demonstrates why including opportunity cost in the calculation is essential. See the investing the difference guide for a full analysis of this trade-off.
Original Housing Decision Insights
The sections below go beyond standard calculator output to address questions and scenarios that most rent vs buy resources do not cover. Each represents an original perspective on the housing decision that is difficult to find on typical calculator websites.
Why Silicon Valley Renters Often Need Longer Break-Even Horizons
In the San Francisco Bay Area and Silicon Valley, the rent vs buy calculation is structurally different from most of the country. The median home price in San Jose exceeds $1.3 million. A 20% down payment of $260,000 is roughly the total purchase price of a home in many midwestern markets. At current interest rates, the monthly mortgage payment on that amount is approximately $7,800 before taxes and insurance, roughly 2.5 times the average rent for a comparable property.
The opportunity cost of the down payment is substantial. $260,000 invested in a diversified portfolio at 6% annual returns grows to roughly $466,000 after ten years. That is nearly $200,000 in investment gains the buyer forgoes. Combined with the high monthly premium of ownership, this opportunity cost pushes the break-even horizon well past a decade in most scenarios. Even with reasonable appreciation assumptions (3-4%), buyers in Silicon Valley typically need 12-18 years to reach break-even.
This does not mean buying in Silicon Valley is always the wrong choice. Long-term owners who stay 20+ years in a market with supply constraints and strong demand can build substantial wealth. But the financial commitment is larger, the break-even horizon is longer, and the flexibility cost is higher than in most other markets. Renters in high-cost markets should be particularly honest about their time horizon and stress-test against conservative appreciation assumptions.
The Hidden Cost of Being Forced to Sell Early
Most rent vs buy analysis assumes the owner sells at a chosen point (year 5, year 10, or year 20). In reality, many sales are involuntary. Job loss, divorce, health emergencies, and family care obligations force homeowners to sell at times and prices they did not choose. A forced sale in a down market compounds the financial damage: the seller pays 6-8% transaction costs on a home that may have lost value.
Consider a buyer who purchases a $500,000 home with 10% down and must sell after four years due to a job relocation. If the market is flat (0% appreciation), the home is still worth $500,000. Transaction costs total $40,000-$50,000. The remaining mortgage balance is approximately $432,000 after four years of amortization (mostly interest in the early years). After paying the mortgage balance from the sale proceeds, the seller walks away with roughly $18,000-$28,000 from the $500,000 sale, less than their original $50,000 down payment. They have lost $22,000-$32,000 plus four years of additional ownership costs.
Ownership duration is often the most important variable in the entire analysis for this reason. A buyer who can confidently commit to 10+ years can absorb market downturns and transaction costs. A buyer with uncertain job stability, limited savings, or life changes on the horizon should weigh the forced-sale risk heavily. Renting preserves the ability to walk away at essentially zero cost.
What Happens When Mortgage Rates Fall After You Buy?
One of the common fears blocking potential buyers is the idea that buying at today's rate locks in a high payment forever. This overlooks the most valuable feature of a fixed-rate mortgage: the option to refinance if rates fall. A buyer who closes at 6.5% today can refinance to 5% or 4.5% if rates drop in future years. The refinancing cost (typically 2-5% of the loan) is far lower than the closing costs of an initial purchase, and the monthly savings can recoup that cost within 12-24 months.
The option to refinance makes today's interest rate less permanent than many buyers assume. Over the past 30 years, 30-year fixed mortgage rates in the U.S. have ranged from below 3% to over 18%. The buyer who purchased at 7% in 2000 could refinance to 6% in 2003, 5.5% in 2005, and below 4% in 2012. Each refinancing reduced their monthly payment permanently without extending their total interest cost (if they continued paying the original schedule).
This does not mean rate assumptions do not matter. They do matter, especially in the critical early years of ownership when the buyer is most vulnerable to cash flow pressure. But the decision to wait for lower rates involves its own risk: prices may rise while you wait, and the cost of waiting (continued rent payments at potentially increasing rates) may exceed the savings from a lower rate. The interest rates guide explores this trade-off in depth.
Why Two People Using the Same Inputs Can Reach Different Conclusions
Person A is 29, single, working in tech. They expect to relocate in approximately 4 years for career advancement. They have moderate savings and plan to use 10% down. Their goal is to minimize total housing cost over the next 4 years.
Person B is 42, married with two children in local schools. They expect to stay in the home for 12+ years. They have a substantial down payment from a previous home sale. Their goal is to maximize long-term equity and stability.
Both persons enter the same numbers into the calculator: $450,000 home price, $2,500 monthly rent, 6.5% mortgage rate, 3% appreciation, 3.5% rent growth. The calculator produces the same break-even year for both: approximately 7-8 years.
Person A, with a 4-year horizon, will sell well before break-even. The calculator shows that renting costs them less over the period. For Person A, the correct decision is to rent.
Person B, with a 12-year horizon, will own well past break-even. The calculator shows buying costs less over the period. For Person B, the correct decision is to buy. The same numbers, the same break-even, a different conclusion. The difference is driven by goals, flexibility needs, and time horizon. Those factors vary between households and are not captured in any calculator's inputs.
Why Rent vs Buy Calculators Often Disagree
Running the same numbers through different rent vs buy calculators can produce different results. This is not because one calculator is wrong. It is because calculators make different choices about which assumptions to use as defaults and which costs to include or exclude.
Appreciation Assumptions
Some calculators use a default appreciation rate of 1-2%, reflecting inflation-adjusted historical averages. Others default to 4-5%, reflecting nominal averages that include inflation. A 2% vs 4% appreciation assumption on a $500,000 home produces a difference of roughly $60,000 in home value after ten years. That gap alone can shift a break-even point by three to five years. Our calculator lets you set this value because no single rate is appropriate for all markets and time periods.
Rent Growth Projections
Rent inflation assumptions range from 2% to 8% across different calculators. A calculator using 2% rent growth will tend to favor renting, because the renter's costs stay low. A calculator using 6% will tend to favor buying, because rent quickly becomes expensive. Both can be correct for different markets. The user needs to know the local rent inflation trend rather than relying on a national default.
Investment Return Assumptions
The opportunity cost of the down payment is one of the most variable inputs. Calculators that ignore it implicitly assume the down payment earns zero return, which biases the result toward buying. Calculators that assume 8-10% stock market returns bias toward renting. A reasonable long-range assumption typically falls between 5% and 7% for a balanced portfolio, but the right number depends on the household's actual investment plan.
Maintenance and Tax Differences
Maintenance assumptions range from 0.5% to 3% of home value annually. Property tax assumptions vary by state. Some calculators include HOA fees; others omit them. A 1% vs 2% maintenance assumption on a $500,000 home costs $5,000 per year in difference, which accumulates to a significant gap over a decade. Our calculator makes every assumption transparent and adjustable so you can see how each one affects the result.
The key takeaway: Calculator outputs are only as reliable as the assumptions they use. A trustworthy calculator does not hide its methodology or lock assumptions behind defaults you cannot change. Always run your own numbers across multiple assumption sets and understand which inputs are driving the result before making a decision.
For a detailed explanation of every assumption used in this calculator, see our full methodology page.
Understanding Break-Even Years
The break-even year is the point at which the cumulative cost of buying falls below the cumulative cost of renting. It is not a fixed number that applies broadly. It changes dramatically when any of the key assumptions shift.
How Small Assumption Changes Shift Break-Even
| Scenario | Appreciation | Rent Growth | Rate | Break-Even |
|---|---|---|---|---|
| Base | 3% | 3.5% | 6.5% | Year 7-8 |
| Low Appreciation | 1% | 3.5% | 6.5% | Year 12+ |
| High Rent Growth | 3% | 6% | 6.5% | Year 5-6 |
| High Rate | 3% | 3.5% | 7.5% | Year 10-11 |
Based on $450,000 home, $2,500 rent, 10% down, 1% maintenance, 1.2% property tax, 6% alternative return.
Buyers who sell early often never reach break-even. The first several years of homeownership are dominated by transaction costs and interest-heavy mortgage payments. In a typical scenario, the buyer remains behind the renter in cumulative cost for at least five to eight years. A buyer who sells before the break-even point has paid more in total than a renter in the same market, even though they received monthly mortgage statements showing "equity building." The equity is real, but it is frequently smaller than the transaction costs incurred to acquire it.
Long-term ownership can produce very different outcomes. For buyers who stay 10, 15, or 20 years, the break-even point becomes a distant milestone. The buyer's cumulative cost advantage grows with each year past break-even because rent inflation continuously widens the gap. A buyer who stays 20 years in a moderate-cost market can end up paying $200,000-$400,000 less in total housing costs than a renter in the same market. The difference is driven primarily by the fixed-rate mortgage's value against compounding rent increases, not by short-term price appreciation.
For a detailed analysis of how break-even changes with different assumptions, visit our break-even analysis guide. To see how different time horizons change the decision, read the 3, 5, and 10-year analysis.
How We Approach Housing Analysis
Every calculator on this site is built on standard financial formulas with transparent, adjustable assumptions. There are no proprietary models, no hidden default values, and no commercial arrangements with lenders or real estate companies that might bias the outputs. All calculations run locally in your browser; your data never leaves your device.
No calculator predicts the future. The results you see are projections based on the assumptions you choose. Real estate markets are shaped by local economic conditions, interest rate policy, demographic trends, and unpredictable events. The responsible way to use any housing cost calculator is to test multiple scenarios rather than treat a single output as definitive.
Assumptions drive results. We default to conservative, historically grounded numbers: 3% appreciation, 3.5% rent growth, 6% alternative investment return. These are starting points for analysis, not predictions. Every assumption can be adjusted to match your local market, personal financial situation, and outlook.
Financial decisions involve risk. Housing is the largest financial commitment most households ever make. No online calculator can capture every factor that matters for your specific situation. We provide the analytical framework; you apply it with knowledge of your own circumstances, risk tolerance, and goals.
About This Project
BuyOrRent.ai is an independent housing analysis resource. We are not a lender, broker, or real estate company. Learn more about our approach →
Our Methodology
All formulas, default assumptions, and data sources are documented openly. If you disagree with an assumption, you can adjust it. Read the full methodology →
For further context, explore our closing cost breakdown, home affordability guide, and first-time buyer checklist.
Disclaimer: This calculator provides estimates for educational purposes only and does not constitute financial advice. Results are based on user-supplied assumptions and standard financial formulas. Housing markets, interest rates, and personal circumstances vary. Consult a qualified financial or real estate professional before making any housing or investment decision.
Why We Built This Calculator
Housing is the largest financial commitment most households ever make. Yet the tools available to evaluate the rent vs buy decision are often simplistic, biased, or opaque. Many calculators lock assumptions behind fixed defaults, ignore opportunity cost, or present a single answer as definitive. We built this calculator to provide a different approach, one based on transparency, scenario testing, and respect for the complexity of the decision.
Housing decisions involve uncertainty. No model predicts future housing markets. Every result this calculator produces is a projection based on assumptions you control. The value of the tool is not in predicting the future but in helping you understand how much your decision depends on factors you cannot control.
Calculators depend on assumptions. Changing the appreciation rate from 3% to 1.5% can shift the break-even year by 4-5 years. Changing rent growth from 3.5% to 5% can shift it by 2 years. A trustworthy calculator does not hide these dependencies or lock assumptions. It makes every variable adjustable and documents the methodology.
No model predicts the future. The most informative use of this calculator is to run multiple scenarios (optimistic, base, and conservative) and compare the range of outcomes. If the break-even year is similar across all three, you can be more confident. If it varies by 5+ years, the honest conclusion is that the uncertainty in your assumptions is larger than the difference between the options. That knowledge is itself valuable.
Scenario testing is important. We encourage all users to run at least three scenarios before making a decision. Observe how changes in appreciation, rent growth, and time horizon affect the outcome. If buying only works under aggressive assumptions, the risk may be higher than you are comfortable with. If buying works across a wide range of inputs, you can proceed with more confidence. The goal is not a single answer. It is a clearer understanding of the range of possible answers. Our full methodology page documents every formula and default assumption.