How do you calculate prorated rent?

Divide the monthly rent by the number of days in the billing period to get a daily rate, then multiply by the number of days the tenant occupies the unit. The three common divisors are the actual days in that month, a flat 30 days, or 365 days per year (monthly rent × 12 ÷ 365).

Which proration method should a landlord use?

Use whichever method your lease specifies. Actual-days is the most common and most defensible; the 30-day and 365-day methods are also widely used. The key is to state the method in the lease and apply it consistently to every tenant.

Prorated Rent Calculator

Figure the exact partial rent when a tenant moves in — or out — in the middle of the month. Pick your method, and the daily rate and prorated total update instantly. Free, no signup.

Monthly rent ($)

Proration method

First day occupied

Last day occupied

For a mid-month move-in, use the last day of the month. For a move-out, use the move-out date.

Prorated rent

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Enter rent and dates above.

Tip: Whatever method you choose, name it in the lease and use the same one for every tenant. That consistency is what makes proration defensible if it's ever questioned.

How prorated rent works

Prorated rent is simply rent charged for a partial billing period instead of a full month. You calculate a daily rate, then multiply it by the number of days the tenant actually has the unit:

Actual days: monthly rent ÷ days in that specific month × days occupied. Most common and easiest to defend, since it charges the true daily value for that month.
30-day month: monthly rent ÷ 30 × days occupied. Simple and predictable regardless of the calendar month.
365-day year: (monthly rent × 12 ÷ 365) × days occupied. Averages the daily rate across the whole year.

This calculator counts both the first and last occupied day (inclusive), which is the usual landlord convention for a move-in-to-end-of-month or a first-of-month-to-move-out period.

A quick example

On $1,500/month rent with a tenant moving in on the 16th of a 30-day month (16th–30th = 15 days), the actual-days daily rate is $50.00, so the prorated first month is $750.00.

Stop doing this by hand every move-in.

PropertyHub prorates the first and last month automatically, bills it, and collects it by ACH — free to start.

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