Rent vs Buy Calculator

How Does the Formula Work?

The rent vs buy calculator compares the total financial outcome of renting a home versus purchasing one over a specified period. This is one of the most consequential financial decisions most people face, and the answer depends on far more than just the monthly payment. The calculator models the complete picture: mortgage payments (principal and interest), property taxes, homeowner's insurance, maintenance costs, and home appreciation on the buy side — versus rent payments, annual rent increases, and the investment return you could earn by investing your down payment in the stock market on the rent side. The net cost of buying subtracts the equity you build, while the net cost of renting subtracts the investment gains you would accumulate.

The US Housing Market Context

The median US home price is approximately $420,000 according to the National Association of Realtors (NAR), while the median monthly rent is about $2,000 according to Zillow. The traditional guideline suggests buying is better when the price-to-rent ratio (home price divided by annual rent) is below 15, and renting is better when it exceeds 20. At the national median, the ratio is 420,000 / 24,000 = 17.5 — squarely in the gray zone. However, this ratio varies enormously by market: San Francisco exceeds 30 (strongly favoring renting), while cities in the Midwest like Cleveland and Detroit are below 10 (strongly favoring buying). Mortgage rates dramatically affect the calculation — at 3% the monthly payment on a $336,000 loan (80% of $420K) is $1,417, but at 7% it jumps to $2,236. This calculator lets you model your specific situation with your local prices and current rates.

Hidden Costs of Buying

Beyond the mortgage payment, homeowners face costs that renters do not. Property taxes average 1.1% of home value nationally (ranging from 0.27% in Hawaii to 2.49% in New Jersey). Homeowner's insurance averages $1,800 per year but varies widely by location and coverage. Maintenance and repairs average 1% to 2% of home value annually — this includes HVAC replacement ($5,000–$15,000 every 15–20 years), roof replacement ($8,000–$20,000 every 20–30 years), appliance replacement, plumbing, electrical, and landscaping. Closing costs when buying average 2% to 5% of the purchase price, and selling costs (agent commission) average 5% to 6%. These transaction costs mean buying only makes financial sense if you stay long enough to recoup them through appreciation and equity building — typically 5 to 7 years minimum.

The Opportunity Cost of a Down Payment

A 20% down payment on a $350,000 home is $70,000. If instead of buying you invested that $70,000 in a diversified stock portfolio returning an average 7% annually (the S&P 500 historical average after inflation), after 10 years it would grow to approximately $137,700 — a gain of $67,700. This opportunity cost is often overlooked in rent-vs-buy comparisons but can be decisive, especially in expensive markets where large down payments are required. The calculator models this by compounding the down payment at your specified investment return rate and subtracting the gains from the total rent cost.

When Buying Usually Wins

Buying typically wins when you plan to stay 7+ years, mortgage rates are below 5%, home appreciation matches or exceeds inflation (3%+), the price-to-rent ratio is below 15, and you can make a 20% down payment to avoid PMI ($100–$300/month additional cost). In stable Midwest markets like Indianapolis, Columbus, and Omaha, buying often wins after just 3–4 years due to low home prices relative to rents. The mortgage interest deduction (for itemizers) and property tax deduction (up to $10,000 under SALT) provide tax benefits that further favor buying for higher-income households.

When Renting Usually Wins

Renting typically wins when you plan to move within 3–5 years, mortgage rates are above 7%, home prices are very high relative to rents (coastal cities), or you have strong investment discipline to actually invest the savings. Renting also wins when you value flexibility — job mobility, no maintenance responsibilities, and no risk of home value decline. During the 2008 housing crisis, homeowners in markets like Las Vegas, Phoenix, and Miami lost 50%+ of their home values while renters were unaffected. The calculator shows this by modeling zero or negative appreciation scenarios. In expensive markets like San Francisco, New York, and Boston, the break-even period for buying can exceed 10–15 years.

Using This Calculator Effectively

Start with realistic local numbers. Use Zillow or Redfin for home prices, Apartments.com or Zillow for comparable rents, and Bankrate or NerdWallet for current mortgage rates. Adjust the appreciation rate based on your local market — Zillow publishes metro-level home value forecasts. For investment returns, 7% is a reasonable long-term stock market average, but conservative investors might use 5%. Run the calculator at multiple time horizons (5, 10, 15 years) to see how the answer changes. The crossover point — where buying becomes cheaper than renting — is the key insight. If it exceeds your expected stay, renting is the better financial choice regardless of the emotional appeal of homeownership.