The Rent vs Buy Question, Answered With Math
“Renting is throwing money away” sounds convincing until you add up the down payment, the closing costs, six figures of mortgage interest, property taxes, insurance, and a decade of maintenance. Buying builds equity — but it also locks up a large pile of cash and comes with costs renters never see. The honest answer is never a slogan; it is arithmetic over the number of years you actually plan to stay.
This free rent vs buy calculator does that arithmetic in the open. Enter your rent and its yearly increase, the home price, down payment, mortgage rate, taxes, insurance, maintenance, and closing costs, and you get a side-by-side total: what renting costs you over your horizon versus the net cost of buying (cash spent minus the equity you keep). The verdict is a plain dollar figure — “Buying wins by $X” or “Renting wins by $X” — plus the breakeven year when buying pulls ahead, if it ever does.
Total cost comparison · equity included
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Please enter a monthly rent and home price greater than zero, and a stay of at least 1 year.
Estimates only — not financial advice. Compares cash spent on renting (with rent growth) against the net cost of buying: down payment + closing costs + mortgage, tax, insurance and maintenance payments, minus the equity you keep (down payment + principal repaid + appreciation). Tax deductions are not modeled. Selling costs and the renter’s investment return on the unspent down payment are modeled when entered above.
How to Use This Calculator
- Enter your monthly rent and its annual increase. Use what you pay today; 2–4% yearly growth is typical in most markets.
- Enter the home price, down payment, and mortgage rate. A 30-year fixed rate is assumed, since it is the most common loan.
- Set how many years you plan to stay. This is the single most important input — short stays punish buyers because closing costs and early mortgage interest are front-loaded.
- Fill in the ownership costs. Annual property tax, home insurance, yearly maintenance as a percent of price (1% is the standard rule), and one-time closing costs (2–5%).
- Add expected home appreciation. This drives the equity estimate; 3% a year is a conservative long-run figure for many markets.
- Click Compare Rent vs Buy. Read the verdict first, then the breakdown: total renting cost, net buying cost, equity built, monthly owning cost, price-to-rent ratio, and the breakeven year.
What the Calculator Actually Compares
Most rent-versus-buy arguments compare a monthly rent check against a monthly mortgage payment. That is misleading twice over: it ignores the renter's rent increases, and it ignores that a big chunk of the buyer's monthly payment comes back as equity.
This calculator compares two honest totals over your chosen horizon. Total renting cost is every rent check you would write, with rent growing each year at your increase rate. Net buying cost is everything buying takes out of your pocket — down payment, closing costs, and every month of mortgage, tax, insurance, and maintenance — minus the equity you keep: your down payment, the principal you repaid, and the appreciation, net of the remaining loan balance. Whichever total is lower wins, and the difference is shown as a dollar verdict.
Two extras sharpen the picture. The breakeven year is the first year buying becomes cheaper than renting — if renting wins the whole horizon, the calculator says so plainly. The price-to-rent ratio (home price divided by annual rent) is the classic quick screen: under 15 generally favors buying, 15–20 is the gray zone where your inputs decide, and over 20 generally favors renting.
The Formula (With a Worked Example)
Total rent = Σ monthly rent × 12 × (1 + rent growth)year
Buying cash out = down payment + closing + (P&I + tax + insurance + maintenance) × months
Equity = appreciated home value − remaining loan balance
Net buying cost = buying cash out − equity
Verdict = total rent − net buying cost (positive favors buying)
Worked example. A $400,000 home, $80,000 down (20%), 6.5% 30-year mortgage, $2,200/month rent growing 3% a year, 10-year stay, 3.5% appreciation, 3% closing costs, $4,800/year tax, $1,200/year insurance, 1% maintenance:
- Loan: $400,000 − $80,000 = $320,000; monthly P&I at 6.5% = $2,022.62
- Monthly owning cost: $2,022.62 + $400 tax + $100 insurance + $333.33 maintenance = $2,855.95
- Total rent over 10 years (3% yearly growth): $302,646
- Buying cash out: $80,000 down + $12,000 closing + $2,855.95 × 120 months = $434,714
- Equity after 10 years: $564,240 appreciated value − $271,284 remaining balance = $292,956
- Net buying cost: $434,714 − $292,956 = $141,758
- Verdict: $302,646 − $141,758 = buying wins by $160,888; breakeven in year 2; price-to-rent ratio 15.2 (gray zone, but the full math favors buying here)
Notice what the monthly comparison missed: $2,856/month of owning looks worse than $2,200 rent, but nearly $293,000 of the buyer's spending comes back as equity. That is why the totals — not the monthly payments — decide.
Tips for a Fair Comparison
- Be honest about your horizon. If there is a real chance you move in 3 years, model 3 years. Closing costs alone (often 2–5% of price) can erase years of equity on a short stay.
- Don't skip maintenance. The 1%-of-price-per-year rule exists because roofs, HVAC systems, and appliances fail on schedule. Renters pay zero of this; buyers pay all of it.
- Stress-test the appreciation. Run the numbers at 0% and 2% appreciation too. If buying only wins when prices soar, you are speculating, not saving.
- Remember what the model leaves out. This comparison ignores selling costs (typically ~6%), tax deductions, and what your down payment could earn invested elsewhere — all of which push the breakeven later. Treat an early breakeven as optimistic.
- Use the ratio as a screen, the totals as the decision. A price-to-rent ratio under 15 is a green light to run the full numbers; over 20, renting usually wins unless you stay a very long time.
- Pair it with affordability. Winning the rent-vs-buy math means nothing if the monthly payment breaks your budget — check what you can actually afford first.
Related Tools
The Key Concept: Unrecoverable Costs
The cleanest way to think about rent vs buy is to compare the money that never comes back. Rent is 100% unrecoverable — every dollar is gone. Ownership has its own unrecoverable slice: mortgage interest, property taxes, maintenance, and insurance, plus closing and selling costs. The rest of a mortgage payment — the principal — is not a cost at all; it is savings stored as equity in the home.
Consider a $400,000 home with 20% down ($80,000) and a 30-year mortgage at 7%. The payment is about $2,129 a month, but in month one roughly $1,867 of that is interest. Add taxes at about $333 a month, maintenance at about $333 a month, and $167 of insurance, and the unrecoverable cost is near $2,700 a month — more than a $2,000 rent for the same street. That early gap is exactly why the calculator so often favors renting for short stays.
What flips the answer over time: the interest share shrinks every month, the rent keeps rising, and the equity you keep is a growing asset.
FAQs
How does a rent vs buy calculator work?
It totals what renting costs over your time horizon (with rent increasing each year) and compares it to the net cost of buying: down payment, closing costs, and all monthly ownership payments, minus the equity you build through principal repayment and appreciation. The lower total wins, and the difference is the verdict.
What is the breakeven year in rent vs buy math?
The first year in which buying becomes cheaper than renting on a cumulative basis. Buying usually starts behind because of the down payment and closing costs, then catches up as equity grows and rent keeps rising. If renting stays cheaper for your entire horizon, there is no breakeven — and the calculator tells you that.
What is a good price-to-rent ratio?
Divide the home price by the annual rent. Under 15 generally favors buying, 15 to 20 is the gray zone where taxes, appreciation, and your time horizon decide, and over 20 generally favors renting. It is a quick screen, not a verdict — the full cost comparison on this page is the decision tool.
Does the calculator count the equity I build as a buyer?
Yes — that is the whole point of the "net buying cost." Your down payment, the principal portion of every mortgage payment, and price appreciation all come back to you as equity (minus the remaining loan balance), so they are subtracted from what buying costs you.
Why does the length of stay matter so much?
Because buying's costs are front-loaded: closing costs hit on day one, and early mortgage payments are mostly interest, not principal. Rent's costs are spread evenly. The longer you stay, the more those upfront costs get diluted and the more equity compounds — which is why breakeven usually lands somewhere between years 3 and 7.
What costs does this comparison leave out?
Selling costs (often around 6% when you eventually sell), mortgage-interest tax deductions, HOA dues, and the investment return your down payment could earn if you rented and invested it instead. Each of those would push any breakeven later, so treat the results as the optimistic case for buying.
Is renting ever the right choice even when buying "wins"?
Often. The math ignores flexibility (moving for a job is far cheaper as a renter), career uncertainty, and the risk of local price drops. A verdict of "buying wins by $5,000 over 10 years" is basically a tie once real-world uncertainty is factored in.
What is the opportunity cost of my down payment?
It is what the down payment could have earned if you had invested it instead of tying it up in the house. $80,000 growing at 7% a year for 10 years becomes about $157,400 — money a fair rent vs buy comparison has to reckon with.
Why do calculators say buying wins if I stay long enough?
Three forces work in the owner's favor over time. First, one-time costs like closing fees are spread over more years. Second, each payment shifts a little more from interest to principal, so the equity you keep grows. Third, rent compounds upward while a fixed-rate mortgage payment stays flat — which is why the break-even year matters more than the first-year comparison.
Run the numbers with our home affordability calculator.