Rent vs. buy calculator

How this calculator works

This calculator compares the estimated net cost of renting versus buying over a comparison horizon you choose in years. For renting, it totals rent paid over the period—with annual rent increases—and tracks what a renter might accumulate by investing the down payment, closing costs, and any monthly savings when ownership costs more than rent.

For buying, it models down payment, closing costs estimated at 2% of home price, monthly principal and interest on the mortgage, property tax, insurance, HOA, and maintenance. It tracks loan amortization, total ownership cash outflows, ending home value after appreciation, and remaining loan balance to compute buyer net position.

Net cost for each path equals total cash paid minus ending net position. The option with lower net cost is labeled the lower estimated cost. Outputs include renting net cost, buying net cost, estimated monthly ownership, buyer net position, and renter investment value.

This is a financial comparison model, not a lifestyle recommendation. It does not include tax deductions, utility differences, transaction costs when selling, or PMI as a separate line item.

What affects the result

Many inputs interact. Small assumption changes often flip close comparisons.

• Comparison horizon matters because buying front-loads closing costs and early interest while equity builds slowly. Short horizons often favor renting; longer periods may favor buying if appreciation and paydown help.
• Monthly rent and rent increase set renter cash outflows. Higher starting rent or faster increases raise renting net cost.
• Home price, down payment, and mortgage rate drive loan amount and monthly principal and interest. Larger down payments reduce borrowing and monthly payment.
• Property tax, insurance, HOA, and maintenance add recurring ownership costs beyond the mortgage. Maintenance defaults to a percentage of home value annually.
• Home appreciation raises ending home value and buyer net position. Lower appreciation favors renting in the model.
• Investment return if renting models opportunity cost—what down payment and monthly housing-gap savings might earn if invested instead of tied up in a home.

Run conservative, base, and optimistic scenarios for appreciation, rent growth, and investment return rather than trusting a single output.

Real-world examples

1. Seven-year horizon, moderate assumptions. Rent $2,400 with 3% annual increases vs. $420,000 home, 20% down, 6.75% rate, 3% appreciation, 5% investment return. Over seven years, one path often shows modestly lower net cost depending on maintenance and appreciation—test your market inputs rather than assuming a universal winner.

2. Short three-year stay. Closing costs and limited equity buildup frequently make renting cheaper on net cost even when monthly mortgage payment resembles rent. Extend horizon to five or seven years to see when buying may catch up.

3. High appreciation market. 4% annual appreciation on a $400,000 home adds roughly $60,000 in value over five years before loan paydown—shifting net cost toward buying if other assumptions are stable.

4. Low down payment buyer. Smaller down payment increases loan amount and monthly payment, raising ownership costs. PMI is not modeled here; actual buying costs may exceed estimates—see the PMI explained guide.

Common mistakes

• Comparing monthly rent to mortgage payment only. Ownership includes tax, insurance, maintenance, and upfront closing costs.
• Using unrealistic appreciation. Long-term national averages near 3% are common planning inputs; local markets vary.
• Ignoring mobility. A buy win on net cost may not justify purchase if you may relocate within two years.
• Setting investment return equal to mortgage rate without context. After-tax returns and risk differ from guaranteed mortgage prepayment savings.
• Choosing too short a horizon for a forever home. Match horizon to how long you realistically expect to stay.
• Forgetting maintenance. Even new homes need upkeep; zero maintenance rate understates ownership.

When to use this calculator

Use this calculator when deciding whether to continue renting or purchase a specific home at a stated price and rent level. It fits evaluating a lease renewal against buying, comparing markets where you might stay five to ten years, and stress-testing assumptions before committing to a down payment.

Pair with the home affordability calculator to ensure the home price fits income and DTI, and the loan payment calculator for payment details. Read the rent vs. buy explained guide and buying a home guide for non-financial factors.

Frequently asked questions

What is a price-to-rent ratio and is it a useful shortcut? The price-to-rent ratio divides home price by annual rent for a comparable property. A ratio below 15 is often cited as favoring buying; above 20 favors renting. A $400,000 home renting for $2,000 per month has a ratio of 16.7. This rule of thumb is useful for a quick directional check, but it ignores your specific mortgage rate, time horizon, appreciation expectations, and investment alternatives. Use the calculator to model your actual inputs rather than relying on the ratio alone.

Does the calculator account for the mortgage interest tax deduction? No. The model uses pre-tax costs and does not model itemized deductions. For many buyers, especially in recent years, the standard deduction exceeds itemized deductions including mortgage interest — particularly at lower loan balances or for borrowers in lower tax brackets. If you plan to itemize and the deduction is meaningful for your situation, entering a slightly lower effective mortgage rate can approximate the after-tax cost of borrowing.

What appreciation rate should I enter? Long-term national average home appreciation is approximately 3% annually, roughly tracking general inflation. Local markets vary significantly — high-demand metro areas have sustained 5% or more in certain periods, while other markets have been flat or negative. Run the calculator at conservative (2%), moderate (3%), and optimistic (4–5%) appreciation rates to bracket the uncertainty. Avoid anchoring on recent short-term appreciation, which can be unusually high or low and does not reflect long-term trends.

What if I put less than 20% down? Lower down payments increase your loan amount and monthly payment. They also typically require private mortgage insurance (PMI) until your loan-to-value ratio drops below 80%. This calculator does not model PMI as a separate line item. If your down payment is below 20%, add an estimated PMI cost — typically 0.5% to 1.5% of the loan amount annually — to the monthly ownership cost to get a more accurate buying scenario. Read the PMI explained guide for when PMI drops off and how to accelerate it.

How does this model renting and investing the difference? The renting path tracks what happens if you invest the down payment and any monthly cash savings when renting costs less than ownership. The "investment return if renting" input captures the assumed annual return on those invested funds. Higher investment return rates favor renting in the model; when rent equals or exceeds monthly ownership cost, there is no cash-flow surplus to invest, and the comparison shifts on equity and appreciation alone.

How reliable is the output for making a real decision? The calculator is a planning tool, not a prediction. Small differences in appreciation, investment return, or rent growth can flip a close comparison. Treat the result as directional — a guide to which path is more likely to cost less under your assumptions — rather than a precise dollar forecast. Factor in non-financial considerations: stability, mobility needs, renovation freedom, and maintenance responsibilities matter alongside the numbers.

Related calculators

Estimate your maximum affordable home price based on income and debt-to-income ratio with the home affordability calculator. Break down the mortgage payment on a specific loan amount and rate with the loan payment calculator. Check how monthly debts affect mortgage qualification with the debt-to-income calculator. Model how extra principal payments reduce interest and shorten payoff with the extra mortgage payment calculator. Compare whether refinancing saves more than staying on the current loan with the refinance break-even calculator.