Prorated Rent Calculator

Move-ins on the 14th, move-outs on the 20th — enter the rent and the date, pick a proration method, and get the exact amount to put in the lease.

Free — no signup Runs in your browser Pairs with the Lease Agreement
Worked example

A move-in on July 20th, worked to the penny

Example: $1,550/month, moving in July 20

July has 31 days. A tenant moving in on the 20th occupies July 20 through July 31 — 12 days. Using the actual-days method:

Daily rate  = $1,550 ÷ 31 days = $50.00/day
Days owed  = 31 − 20 + 1 = 12 days
Prorated   = $50.00 × 12 = $600.00

Under the banker’s-month method the daily rate is $1,550 ÷ 30 = $51.67, so the same 12 days come to $620.00. Neither method is “wrong” — what matters is that the lease says which one applies, which is exactly what our lease agreement asks you.

FAQ

Prorated rent questions

Divide the monthly rent by the number of days in the billing basis (the actual days in that month, or 30 under the banker’s-month convention) to get a daily rate, then multiply by the number of days the tenant occupies the unit. This calculator does both and shows the daily rate so the math is checkable.
Actual days is the most common and feels fairest to tenants — February costs more per day than July. The banker’s month keeps the daily rate identical year-round, which some landlords prefer for consistency. Some states point to one method for specific situations, so check your lease and local rules; the important thing is applying one method consistently.
Usually only if the lease says so — in most states there’s no law forcing proration for a mid-month move-in. That’s why the proration method belongs in the lease itself rather than in a handshake.
Yes, by convention — if the tenant gets keys on the 20th, the 20th is a day of possession and is charged. This calculator counts it (the “+1” in the formula).

This calculator provides general estimates for planning purposes and is not legal, tax, or financial advice. Proration rules can vary by lease and state.

You’ve got the number.
Now put it in the lease.

BizDocs builds a complete, customized lease agreement from plain-English questions — proration method included — in about ten minutes.

Create a Lease Agreement All Calculators