Prorated Rent Calculator
Calculate partial-month rent using either actual calendar days or a 30-day month convention, with daily rate and charged share shown.
Calculate prorated rent
Prorate monthly rent using actual calendar days or a 30-day convention.
How the Prorated Rent Calculator works
Prorated rent is monthly rent multiplied by the fraction of the rental period being charged. Under an actual-days convention, daily rent is monthly rent ÷ the number of calendar days in that month. Under a 30-day convention, the monthly amount is divided by 30 regardless of the month’s length.
How to use this prorated rent calculator
Enter the monthly rent, number of chargeable occupancy days, the calendar month length and the convention you need. Count days according to the lease—for example, whether move-in day is included and move-out day excluded—because the day-count rule can change the result even when the mathematical formula is the same.
How to interpret the result
The daily rate and percentage-of-month outputs make the proration auditable for tenants, landlords and property managers. If the chargeable days equal the denominator, prorated rent equals the full monthly rent. The remaining amount simply shows the portion of monthly rent not charged under the entered day count.
Assumptions and limitations
Proration practices are contractual and jurisdiction-specific. Some leases use daily annual rent, banker’s months or other methods. Local housing rules may limit how partial periods are billed. This calculator does not determine the legally correct method and does not add utilities, late fees, deposits or other charges.
Practical example and workflow
For 30,000 monthly rent and 12 chargeable days, an actual 31-day month produces a different charge than a 30-day convention. By showing the denominator and daily rate, the property manager can document exactly how the partial-month amount was obtained.