What is the rent vs buy calculator?
In short
Whether renting or buying is cheaper depends on how long you stay. In the first few years, renting is often cheaper because buying involves closing costs (typically 3%), down payment opportunity cost, and higher housing costs. After the break-even point — often 5–7 years in most US markets — buying typically wins thanks to equity building and appreciation.
This rent vs buy calculator computes the true 5-year (or custom horizon) total cost of each path, accounting for closing costs, mortgage payments, property taxes, maintenance, equity gained, and the investment return you'd earn on the down payment if you rented instead.
How to use this calculator
- 1Enter the home price and your down payment percentage.
- 2Set the mortgage rate, property tax rate, and expected home appreciation.
- 3Enter your current monthly rent and an investment return for the down payment if invested.
- 4Adjust the time horizon to match how long you plan to stay.
- 5Compare total costs and find the break-even year.
The formula
- P&I
- — Monthly principal and interest payment
- equity
- — Principal paydown plus home appreciation
- inv growth
- — Growth of down payment invested in stocks
- ins
- — Renter's insurance (~$200/year)
- maint
- — Annual maintenance (1% of home value)
Worked example
The scenario
$350,000 home, 20% down, 6.5% mortgage, 1.2% tax, 3% appreciation, $2,000/month rent, 7% investment return, 5-year horizon.
The result
Over 5 years, total buying cost ≈ $98,000 and total renting cost ≈ $87,000 — renting saves ~$11,000. Break-even occurs around year 7–8.
Common use cases
- Deciding whether to buy a home or continue renting
- Finding the break-even year before committing to a purchase
- Comparing different time horizons (3 years vs 10 years)
- Evaluating the opportunity cost of tying up a down payment
Limitations & assumptions
- Assumes a 30-year fixed mortgage regardless of time horizon.
- Closing costs are fixed at 3% — actual costs vary by state and lender.
- Does not model PMI for down payments below 20%.
- Rent inflation over the horizon is not modelled (assumes flat rent).
- Tax benefits (mortgage interest deduction) are not included.
Frequently asked questions
Disclaimer: KalkWise calculators are provided for general informational and educational purposes only and do not constitute financial, investment, tax, or legal advice. Results are estimates based on the figures you enter and the assumptions described above. Actual outcomes will vary. Consult a qualified professional before making financial decisions.