Prorated Rent Calculator: Actual Days vs 30-Day Method
Avoid an unexplained first- or last-month rent amount. Compare two common arithmetic methods side by side and record the agreed lease convention.
Enter the rental period
Proration breakdown
This calculator only compares arithmetic. Your signed lease, local law and agreed day-count convention control. Do not use it to retroactively alter an executed agreement or determine legal entitlement.
Why two landlords can calculate different partial-month rents
Rent proration commonly divides monthly rent by the number of calendar days in the month or by a fixed 30-day convention. For example, a 31-day month with $2,400 monthly rent has a daily rate of $77.42 using actual days, versus $80 using a 30-day divisor. Neither formula is universally correct for every lease and jurisdiction.
Enter the first and last days of occupancy and whether the last day counts. The calculator shows both totals and the difference so both parties can agree on the amount before signing. It does not evaluate whether an early move-out qualifies for proration.