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Prorated rent calculator

Work out rent for a partial month when a tenant moves in or out mid-month. Choose a calculation method and see every step, so the amount is easy to explain.

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Your numbers

Which partial month?

This day is counted as an occupied day.

Calculation method

Use the method your lease specifies. If it doesn’t specify one, “days in that month” is the most common and the easiest to explain.

Prorated rent for the partial month

$987.10

17 of 31 days charged

How it’s calculated

  • Daily rate = $1,800 ÷ 31 days in the month = $58.06
  • Days charged = 17 (day 15 to day 31, including the move-in day)
  • Prorated rent = daily rate × 17 days = $987.10

The daily rate is shown rounded to the cent, but the unrounded rate is used. Only the final amount is rounded, to the nearest cent.

Summary

Monthly rent: $1,800
Move-in date: October 15, 2026
Method: Days in the month
Daily rate = $1,800 ÷ 31 days in the month = $58.06
Days charged = 17 (day 15 to day 31, including the move-in day)
Prorated rent = daily rate × 17 days = $987.10
Amount due for the partial month: $987.10

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The three methods

  • Days in that month: daily rate = monthly rent ÷ number of days in that month. The most common method. A day costs slightly more in February than in a 31-day month.
  • 365-day year: daily rate = monthly rent × 12 ÷ 365 (366 in a leap year). Every day costs the same throughout the year.
  • 30-day month: daily rate = monthly rent ÷ 30. Simple to calculate, but it treats every month as 30 days long.

Prorated rent = daily rate × days charged. For a move-in, days charged run from the move-in day to the end of the month. For a move-out, they run from the 1st to the last day of occupancy.

Rounding and limits

The calculator keeps the daily rate unrounded and rounds only the final amount to the nearest cent. If a method would charge more than one month’s rent, the amount is capped at one month’s rent.

Example

Rent is $1,800 and the tenant moves in on April 20. April has 30 days, so the tenant occupies 11 days (April 20 to 30). With the days-in-the-month method, the daily rate is $1,800 ÷ 30 = $60, and prorated rent is $60 × 11 = $660.

Settling into a new tenancy? See the first-month checklist.

Common questions

Which proration method should I use?
Use the method your lease states. If the lease doesn’t state one, the days-in-the-month method is common and easy for tenants to check. Whichever you pick, use the same method for every tenant.
Is the move-in day charged?
In this calculator, yes. The move-in day and the last day of occupancy both count as occupied days. If your lease counts days differently, adjust the date by one day.
Why can the 30-day method give a different answer?
It uses the same daily rate in every month. In a 31-day month a full month would cost more than one month’s rent, so the result is capped at one month’s rent. In February it charges less than the days-in-the-month method.
Do state laws affect prorated rent?
Some states and cities have rules about rent calculations or partial months. This calculator doesn’t include state-specific rules, so check your lease and local law.

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