Prorated Rent Calculator
Use this prorated rent calculator to estimate rent for a partial month. Enter the monthly rent and a move-in or move-out date, then choose the calculation method required by your lease or rental policy.
(Monthly Rent ÷ Days in Month) × Days OccupiedInteractive step-by-step proof
- Enter values above to see the calculation unfold step by step.
Estimate partial-month rent from a monthly amount
Prorated rent is a partial-period rent amount calculated from a larger rent amount. A common calendar-month method divides monthly rent by the number of days in that month, then multiplies the daily rate by the number of billable days. HUD uses that actual-days method in specific subsidized-housing lease instructions for a first partial rental period.
A 30-day divisor also appears in some lease provisions and rental practices. Because the chosen method can change the result, this page lets you calculate either an actual-calendar-day amount or a 30-day-divisor amount without claiming that one method governs every tenancy.
Whether proration is required, and exactly which days or charges count, can depend on the lease and applicable law. Treat the result as a math estimate to compare with the governing documents.
Prorated rent formulas used by this calculator
The calculator first derives a daily rate, then multiplies it by the charged days. It does not decide which legal or contractual method applies.
Actual-days method
Daily rate = monthly rent ÷ calendar days in month. Then prorated rent = daily rate × charged days.
30-day-divisor method
Daily rate = monthly rent ÷ 30. The calculator then multiplies that rate by the charged days selected by its move-in or move-out logic.
Move-in mode
Counts from the selected date through the end of the calendar month, including the selected date. For the 30-day method, dates after day 30 require special handling, so the calculator validates that case rather than silently producing a misleading result.
Move-out mode
Counts from day 1 through the selected date, including the selected date. Confirm that this matches your lease or rental policy before relying on the result.
Prorated Rent Calculator Examples
These examples verify the calculator’s arithmetic. They do not establish what a particular tenant legally owes.
1,800 monthly rent, April 20 move-in
60.00 × 11 = 660.00 in the same currency as the monthly-rent input.
2,200 monthly rent, June 12 move-out
The calculator keeps full precision until the final display: (2,200 ÷ 30) × 12 = 880.00.
1,400 monthly rent, February 25 move-in
50.00 × 4 = 200.00. In a leap year, the actual-days divisor for February is 29.
Where prorated rent calculations go wrong
Not checking the lease for a specified method
Many leases state exactly which proration method to use. Applying the wrong one — actual days versus a flat 30-day month — can produce a rent figure that’s off by several dollars a day, which adds up over a partial month.
Assuming every agreement counts dates the same way
This calculator includes the selected move-in or move-out date. Your agreement or applicable law may define the billable period differently, so confirm the dates before using the result.
Applying the base-rent formula to every charge
Deposits, utilities, parking, pet charges, concessions, and other fees can follow different terms. This calculator only prorates the monthly rent amount you enter.
Using this tool for a within-month start-and-end range
This calculator accepts one boundary date and assumes the charged period reaches the beginning or end of that month. For a tenancy that both starts and ends within the same month, calculate the exact billable day range required by the agreement instead.
Forgetting that February changes the daily rate
Under the “actual days” method, February’s 28 (or 29, in a leap year) days produce a noticeably higher daily rate than a 31-day month at the same rent — don’t assume the daily rate is constant across the year.
Prorated rent calculator: frequently asked questions
How do I calculate prorated rent?+
Which proration method should I use — actual days or a flat 30-day month?+
Is the move-in day itself charged?+
Is the move-out day itself charged?+
Does prorated rent include security deposits or other fees?+
What if I’m moving in and out in the same month?+
Related calculators and guidance
Use the general pro rata tool for other proportional calculations, or continue to related finance and property resources.
Prorated Rent Calculator References
These references support the calculation methods and the need to check the governing lease or rules. They do not create a universal rent-proration rule for every jurisdiction.