Prorated Rent Calculator
If you move in or move out partway through a month, enter your monthly rent, the number of days in that billing month and the number of days you will actually occupy the unit to see the exact prorated amount you owe.
Day basis
days
days
For 18 of 31 days in the billing month
- 1
Basis days
Actual days in month = 31Using actual calendar days in the billing month. - 2
Daily rate
2,000 ÷ 31 = 64.52 - 3
Prorated rent
64.52 × 18 = 1,161.29
How does this calculator work?
Prorated rent = Monthly rent ÷ Days in billing month × Days you occupy. A $2,000/month lease in a 31-day month is $64.52/day; moving in on the 14th (18 days) = $1,161.29. Some leases use a fixed 30-day basis — check your agreement for the correct divisor.
Formula
How this is calculated
Prorated rent is a fair-share calculation that charges a tenant only for the days they actually occupy the unit in a partial month. The most common method divides the monthly rent by the number of days in the billing month (the "actual-day" basis) and then multiplies by the days occupied. For example, a $2,000/month lease in a 31-day month gives a daily rate of $64.52; a tenant who moves in on the 14th occupies 18 days and owes $64.52 × 18 = $1,161.29.
Some leases use a 30-day basis regardless of the calendar month. This simplifies accounting but can slightly over- or under-charge in months with 28, 29 or 31 days. Check your lease agreement for the basis your landlord uses — select the matching option above.
Landlord–tenant laws in some jurisdictions prescribe the proration method, while others leave it to contract. The formula above reflects the two most common commercial practices; consult local regulations or your lease for the legally binding method in your area.
Frequently asked questions
Typically your move-in date counts as the first day of occupancy. If you move in on the 14th of a 31-day month you occupy days 14 through 31 = 18 days. Confirm the counting convention with your landlord — some exclude the move-in day, others exclude the last day.
In most jurisdictions yes — charging full rent for a partial month of occupancy is generally considered unfair or unlawful. However, the specific calculation method may not be mandated by law and is often left to the lease terms. Always document the agreed amount in writing before you move in.
The same formula applies. Enter the total calendar days in your final month and the number of days you will occupy. The resulting prorated amount is what you should owe for that partial month; any excess paid should be refunded by the landlord.
Also known as
TG we-Calculate Editorial Team. (2026). Prorated Rent Calculator [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/prorated-rent-calculator
TG we-Calculate Editorial Team. "Prorated Rent Calculator." TG we-Calculate. 2026. https://we-calculate.com/calculator/prorated-rent-calculator.
TG we-Calculate Editorial Team, "Prorated Rent Calculator," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/prorated-rent-calculator
@misc{wecalculate_prorated_rent_calculator, title = {Prorated Rent Calculator}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/prorated-rent-calculator}}, year = {2026}, note = {TG we-Calculate} }
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