Prorated Rent Calculator.
A tenant moving in or out mid-month owes rent for part of the month. Enter the rent and the date to see the amount, the daily rate, and the math — plus how the three common proration methods compare.
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This method produced more than a full month of rent, so the amount is capped at the monthly rent.
The math
All three methods, same dates
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A calculation aid, not legal advice. Your lease and state or local law control how rent is prorated.
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How to calculate prorated rent
Prorated rent is the portion of a month's rent a tenant owes when they occupy the unit for only part of that month. You work out a daily rate, then multiply it by the number of days the tenant is responsible for.
For worked move-in and move-out examples, see the full guide to calculating prorated rent.
For a move-in, count from the move-in date through the last day of the month. For a move-out, count from the first of the month through the last day of the tenancy. The move-in day is charged; the move-out day usually is too, because the tenant still has possession of the unit that day.
The three proration methods
Landlords use three different divisors, and they produce different numbers for the same dates. On $2,000 rent with an October 17 move-in — 15 days in a 31-day month — they come out like this:
- Days in the actual month. $2,000 ÷ 31 × 15 = $967.74. The daily rate changes with the length of the month. The most common method and the easiest to explain to a tenant.
- 30-day month. $2,000 ÷ 30 × 15 = $1,000.00. Simple and consistent, but in a 31-day month it charges slightly more per day than the tenant actually owes, and in February it charges less.
- Annualized. ($2,000 × 12) ÷ 365 × 15 = $986.30. The fairest across a full year, since every day costs the same no matter which month it falls in, but rarely used in residential leases.
None of these is universally "correct." What matters is that you use the method the lease names, apply it consistently to every tenant, and show the tenant the math.
Put the number in writing
Whichever method you use, give the tenant the calculation, not just the total — the rent amount, the daily rate, the days charged, and the dates covered. It prevents the "why is my first month different?" conversation and gives you a record if the amount is ever disputed. The worksheet this tool generates covers all four.
Frequently Asked Questions
Is a landlord required to prorate rent?
It depends on the lease and on state or local law. Many leases require proration for a partial first or last month, and some jurisdictions require it in specific situations. Absent a rule either way, proration is the standard practice because charging a full month for a partial one is difficult to justify.
Which proration method should I use?
The one the lease names. If the lease is silent, dividing by the actual number of days in that month is the most common and the easiest to defend, since the tenant pays exactly for the days they had the unit.
Do you charge for the move-in day?
Yes. The tenant has possession and access starting that day, so it counts. The same logic applies to the move-out day, which is why this calculator charges for it by default.
When is prorated rent due?
Usually at move-in along with the deposit, or on the normal due date of the partial month. Some landlords collect a full month at move-in and prorate the second month instead. Either is fine as long as the lease says so.
How do you prorate rent in February?
Divide the monthly rent by 28 — or 29 in a leap year — if you use the actual-days method. This calculator handles leap years automatically. Under the 30-day method, February's daily rate is lower than the actual-days rate, which means the tenant pays slightly less.
Can prorated rent be more than the monthly rent?
No. If a method would produce more than one full month — the 30-day method applied to all 31 days of a long month, for example — the amount should be capped at the monthly rent. This calculator caps it and tells you when that happened.
Stop doing rent math by hand.
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