Rent Calculator

What this calculator actually computes

The module behind this page takes six inputs — monthly rent, whether utilities are included, monthly utility cost if not, annual renter's insurance, an annual rent-increase rate, and the number of years you plan to rent — and produces a lifetime cost, not just a monthly one. The core line is short: monthly total cost = rent + utilities (if not included) + insurance ÷ 12. Everything else is that number compounded forward.

The compounding is the part a flat "rent × 12" estimate misses. Each year's rent is last year's rent multiplied by (1 + annual increase), so the total cost over a multi-year stay is the sum of a growing series, not a constant one. Small annual increases add up faster than they feel — a rent that rises 2.9% a year is 12.1% higher after four years and nearly 30% higher after nine, purely from compounding.

Why the rate you enter matters more than the starting rent

The single input that moves this calculator's long-run total the most is the annual increase rate, not the starting rent. Because the model compounds, a one-point difference in that rate — say 3% instead of 2% — changes a ten-year total by thousands of dollars even when the starting rent is identical. Most renters guess this number; the calculator does not guess it for you, and neither do we. The one nationally measured rent-growth figure available is the BLS Consumer Price Index for Rent of Primary Residence, which rose 2.9% unadjusted over the twelve months to July 2026 (index level 447.963, base period 1982–84 = 100). It is worth being precise about what that number is: it is one component of the CPI market basket, built from a national sample of rent changes, not a survey of asking rents on the open market. Use it as a rough national baseline for the increase-rate field, then adjust for your own metro and lease history — CPI rent tends to lag what a new lease actually asks, because it tracks existing tenancies as well as turnover units.

For the starting-rent field, the most defensible national anchor is the Census Bureau's Housing Vacancy Survey, which put the median asking rent at $1,531 in its second-quarter 2026 release — the same release that reported a 7.3% national rental vacancy rate. That vacancy figure is not an input to this calculator, but it is useful context for the increase-rate assumption: a market running near 7% vacancy has less pricing power to push rents than a market running near 4%, so a national increase rate will understate growth in a tight local market and overstate it in a loose one.

What the total leaves out — and why insurance is a blank field

This tool intentionally leaves the renter's insurance field for you to fill in rather than defaulting it. Premiums vary by coverage limit, deductible, location, and insurer in ways no single verified national figure captures, so the honest move is an empty field rather than a number dressed up as research. The same logic applies to move-in costs (security deposit, application fees, broker fees) and to any income-based affordability rule — this calculator answers "what will renting cost over time," not "what can I afford," and it does not ask for your income at any point.

• ·One-time move-in costs. Security deposits, application fees, and broker fees (common in some metros) are outside this monthly-cost model entirely.
• ·Parking, storage, and pet fees. If your lease itemizes these separately from base rent, add them into the monthly rent field yourself — the calculator has no dedicated slot for them.
• ·Anything your specific market is doing right now. The 2.9% CPI figure is a national twelve-month average; individual metros routinely run several points above or below it in either direction.

Two federal rent numbers, and why they are not the same

It is easy to confuse the Census asking-rent figure this calculator's starting-rent example uses with a second federal rent number: HUD's Fair Market Rent for FY2027. FMR is the 40th-percentile gross rent HUD uses to set Housing Choice Voucher payment standards by metro — it is a policy benchmark, not a market median or average asking rent, and this page does not treat it as one. If you are budgeting for an open-market unit, the Census median asking rent is the closer analogue; if you are evaluating what a voucher will cover, FMR is the number that matters, and the two should not be swapped for each other.

Reading a lease renewal against this estimate

When a landlord proposes a renewal increase, this calculator is a useful sanity check in one direction: compare the proposed percentage increase to the 2.9% national CPI rent figure. An increase meaningfully above that is not automatically unreasonable — vacancy in your specific building or metro may be tighter than the 7.3% national rate — but it is a fair prompt to ask what local vacancy and comparable-unit data the landlord is using to justify it, rather than accepting a round number on its own authority.

The other direction matters too. Renters comparing a lease renewal against a fresh unit sometimes forget that CPI rent growth reflects sitting tenants as well as new move-ins, and new-lease asking rents can move faster in either direction than the CPI print suggests. Treat the increase-rate field as a starting assumption to stress-test, not a forecast the calculator is making on your behalf — nothing here predicts what your specific landlord will do next year.

It is also the natural jumping-off point for the buy side of the decision. Every fixed-rate mortgage comparison depends on the rate available that week — as of the Freddie Mac Primary Mortgage Market Survey for the week ending September 3, 2026, that was 6.71% on a 30-year fixed loan. The rent vs. buy investor calculator takes the lifetime rent total this page produces and weighs it against ownership at that rate.