Rent vs. Buy Calculator

Comparing the True Cost of Renting vs. Buying

This calculator compares two very different cost shapes over the same period: renting's cost that simply grows every year, against buying's cost, which includes real cash outlays (mortgage interest, taxes, insurance, maintenance) offset by home equity and appreciation that isn't spent, but is recovered value if you sell.

Why There's No Single Formula Here

Unlike a simple loan payment or a percentage calculation, this comparison depends on a year-by-year simulation: rent compounds annually at its own growth rate, mortgage interest changes every month as the loan amortizes, and appreciation compounds on the home's value across the whole period. There's no single closed-form equation that captures all of that at once, so this calculator simulates each year explicitly rather than showing one substituted formula line.

How the Comparison Is Built

Renting's total cost is simply each year's monthly rent times 12, with rent increasing by the entered annual percentage every year. Buying's net cost adds up differently: total mortgage interest paid (not the full payment — principal comes back to you as home equity) plus total tax, insurance, and maintenance costs, plus optional closing costs, minus the home's total appreciation gain over the period, plus optional selling costs applied once at the end. The down payment itself isn't counted as a net cost, since it becomes home equity you'd recover when selling.

$$\text{Net Cost of Buying} = \text{Total Interest} + \text{Total Tax/Insurance/Maintenance} + \text{Closing Costs} + \text{Selling Costs} + \text{Opportunity Cost} - \text{Appreciation Gain}$$

Worked Example

On a 1,800-dollar monthly rent growing 3% a year versus a 300,000-dollar home with a 20% down payment at 6.5% over 30 years, compared over 10 years: total rent paid comes to roughly 247,600 dollars. Buying's total mortgage interest over those 10 years is about 145,500 dollars, plus roughly 52,500 dollars in tax, insurance, and maintenance (at 1.75% of home value per year) — but the home's appreciation gain at 3% a year over 10 years is about 103,200 dollars, bringing buying's net cost down to roughly 94,800 dollars. In this example, buying is projected to cost about 152,800 dollars less than renting over the 10-year period.

Simplifying Assumptions Worth Knowing

This calculator assumes you'd sell the home at the end of the comparison period to realize the appreciation gain as recovered value — if you don't plan to sell, that gain is only on paper. It also holds tax, insurance, and maintenance at a constant percentage of the original home price each year rather than modeling them growing with inflation. Closing costs (paid at purchase) and selling costs (real estate commissions and closing costs if you sold at the end of the period, typically 6% to 10% of the home's value combined) are both included, but only if you fill in the Closing Costs and Selling Costs fields above — left at their 0% default, the comparison behaves exactly as it did before those fields existed. Treat the result as a directional estimate of which option costs less, not a precise forecast.

Common Rent vs. Buy Mistakes

Comparing a mortgage's full monthly payment against rent, instead of the interest portion alone, understates buying's real advantage, since principal paid is money that comes back to you as equity, not a true cost. Ignoring maintenance and repair costs on the buying side is the opposite mistake, making buying look cheaper than it will actually be — unlike renting, a homeowner is responsible for every repair.

Rent vs. Buy Terms You Should Know

Home Equity — the portion of a home's value you actually own, built through your down payment plus the principal you've paid off, growing further with appreciation.

Appreciation — the increase in a home's market value over time; not guaranteed, and can also go negative in a down market.

Opportunity Cost — what a down payment could have earned if invested elsewhere instead of put into a home purchase. Optionally modeled here via the Alternative Investment Return field, added to buying's net cost as a compounded foregone-growth figure — 0 unless that field is set.

This calculator provides estimates for educational and planning purposes only. Actual costs depend on local market conditions, tax rules, and your specific loan terms. Consult a qualified financial advisor for guidance specific to your situation.