Calculator · free · runs in your browser
Prorated Rent Calculator
Moving in or out mid-month? Enter the monthly rent and the date to get the rent for the partial month — by the days-in-month, 30-day or 365-day method, side by side, with the formula — then copy it as a lease clause or turn it into a rent receipt.
Prorated rent
| Method | Daily rate | Days | Rent |
|---|
Some landlords collect the next full month together with a late-month proration — a common convention, not a legal rule. Enter your cutoff day to see the total due at signing.
Lease clause
Enter the rent and the date to see the prorated amount. Nothing you type leaves your browser; the page address updates so you can share or bookmark the calculation.
What is prorated rent?
Prorated rent is the rent for only part of a month: the share of the monthly rent that covers the days the tenant actually has the unit, usually because they move in or out mid-month. It is a daily rate times the days occupied, and a whole month is always the full rent.
Three ways to prorate the same month
Same example for all three: $1,500 rent, move-in on November 16, 2026 — 15 days of a 30-day month.
- Days in the month. Rent ÷ days in that month × days occupied: $1,500 ÷ 30 = $50.00/day × 15 days = $750.00. The daily rate changes with the month.
- 30-day (banker’s) month. Rent ÷ 30 × days occupied: $50.00/day × 15 days = $750.00. Same daily rate every month.
- 365-day year. Rent × 12 ÷ 365 × days occupied: $49.3151/day × 15 days = $739.73. Also constant all year; slightly lower in short months.
Moving out instead? $1,500 with a move-out on October 10, 2026 is $1,500 ÷ 31 × 10 days = $483.87 (Oct 1, 2026 – Oct 10, 2026). Related: the deposit return calculator for the move-out deadline and the rent split calculator for shared homes.
How to calculate prorated rent
Prorated rent = monthly rent ÷ days in the month × days occupied With $1,500 and a move-in on November 16, 2026: $1,500 ÷ 30 × 15 days = $750.00. For the 30-day method divide by 30; for the 365-day method, multiply the rent by 12 and divide by 365.
- Start from the monthly rent. Take the full monthly rent stated in the lease.
- Choose the daily-rate method. Days in that month (rent ÷ 28–31), the 30-day banker’s month (rent ÷ 30), or the 365-day year (rent × 12 ÷ 365).
- Count the days occupied. Move-in: from the move-in day to the last day of the month. Move-out: from the 1st to the move-out day. Both dates in one month: from move-in to move-out. Count the first and the last day.
- Multiply and round to the cent. Daily rate × days occupied, rounded to the cent. A whole month is always the full rent, never more.
- Write it into the lease. State the amount, the dates it covers and the method in the lease or move-out agreement, so both sides sign the same number.
Frequently asked questions
How is prorated rent calculated?
Work out a daily rate from the monthly rent, then multiply it by the number of days the tenant actually has the unit in that month — the move-in day and the move-out day both count. The daily rate depends on the method: rent ÷ the days in that month (28–31), rent ÷ 30 (the “banker’s” 30-day month), or rent × 12 ÷ 365. With $1,500 and a move-in on November 16, 2026, the three methods give $750.00, $750.00 and $739.73.
What is the 30-day (banker’s) method?
It divides the monthly rent by 30 whatever the month, so the daily rate never changes. In a 30-day month it matches the days-in-month method; in February it charges less per partial month than days-in-month would, and in 31-day months slightly more per day. This calculator never charges more than one full month’s rent, whichever method you pick.
Which method should I use?
Any of the three works as long as the lease says which one applies — they are arithmetic conventions, and the difference is usually a few dollars. Days-in-month is the most intuitive; the 365-day method gives the same daily rate all year. The lease clause this calculator writes names the method, so there is nothing to argue about later.
How do I prorate rent for a move-out?
Use the Move-out tab: the tenant pays from the 1st of the month through the move-out day. With $1,500 of rent and a move-out on October 10, 2026, that is $1,500.00 ÷ 31 days × 10 days = $483.87 by the days-in-month method.
Is the move-in day counted? And the move-out day?
This calculator counts both: the tenant has the keys on the move-in day and still has the unit on the move-out day. Moving in on the 16th of a 30-day month means 15 days are charged (16th through 30th). If your lease ends the rent on the day before the keys are returned, take one day off.
What is due at signing for a late-month move-in?
A common convention — not a legal rule — is that when the move-in falls after a cutoff day the landlord sets, the prorated amount and the next full month are collected together at signing, and regular rent starts the month after. The calculator shows that total if you enter a cutoff day; otherwise only the prorated amount is due.
Is the landlord required to prorate?
It depends on your lease and, in some states, on statute. For example, when a tenancy ends before the agreed date, California law says the tenant “must pay the due proportion of the hire for such use as he has actually made” (Cal. Civ. Code §1935). Check your state’s landlord-tenant law; writing the prorated figure into the lease is the simplest way to make it binding on both sides.
Does prorating change the security deposit?
No. The deposit is a separate amount, usually based on the full monthly rent, and is subject to your state’s deposit limits and return deadlines rather than to the prorated month.
General information and arithmetic, not legal advice. Proration is usually a matter of agreement; local rules may apply.