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Prorated rent calculator
Rent for a partial first or last month. Pick the date and the method in your lease; the calculator shows all three common methods side by side.
Prorated rent
$0
0 days at $0 a day.
All three methods
| Days in that month (30) | $0 |
|---|---|
| 365-day year | $0 |
| 30-day month | $0 |
Some leases charge the full first month and prorate the second instead, so the tenant never pays a tiny amount. A few states set rules for proration at move-out; check your lease and your state's landlord-tenant law.
The three methods
| Method | Daily rate | Example: $1,800 rent, move in November 18 |
|---|---|---|
| Days in the month | Rent / days in that month | $1,800 / 30 x 13 days = $780.00 |
| 365-day year | Rent x 12 / 365 | $59.18 x 13 days = $769.32 |
| 30-day month | Rent / 30 | $60.00 x 13 days = $780.00 |
In a 30-day month the first and third methods match. In a 31-day month or in February they do not.
Write it into the lease
Most disputes over prorated rent come from leases that do not say how it is worked out. A single sentence fixes that: "Rent for a partial month is the monthly rent divided by the number of days in that month, times the days of the tenancy in that month."
Checking an applicant's income first? Use the rent-to-income calculator.
Questions
What does prorated rent mean?
Prorated rent is rent for part of a month. When a tenant moves in or out on a day other than the first, they pay only for the days they have the unit, worked out from a daily rate.
How do you calculate prorated rent?
Find the daily rate, then multiply by the days the tenant has the unit. The most common daily rate is the monthly rent divided by the number of days in that month. Others divide the yearly rent by 365, or the monthly rent by 30.
Does the move-in day count?
Usually yes: a tenant who gets the keys on the 18th pays for the 18th through the end of the month. This calculator includes both the first and the last day.
Is a landlord required to prorate rent?
It depends on the lease and the state. Many leases spell it out; some states have rules for the last month or when a tenancy ends early. If your lease says nothing, agree on the amount in writing at move-in.
Why does each method give a different amount?
Because the daily rate changes. In a 31-day month, dividing by 31 gives the lowest daily rate; dividing by 30 gives the highest. In February the order flips. The gap is usually a few dollars.
Next steps
Last updated November 5, 2026.