Prorated Rent Calculator
Moving in or out mid-month? Enter the monthly rent and the date to get the exact amount owed for the partial month — using whichever proration method your lease specifies.
Stop prorating rent by hand
StackRent prorates partial months automatically the moment you set a lease start or end date — no spreadsheets, no rounding drift across your whole portfolio.
How prorated rent is calculated
Proration splits a full month's rent down to the days a tenant actually occupies the unit. You find a daily rate, then multiply it by the number of occupied days. In the most common approach the move-in day itself counts as an occupied day, so a tenant moving in on the 20th of a 30-day month pays for 11 days.
Three proration methods
The actual-days method divides rent by the real number of days in that month (28–31). The 30-day (banker's) method always divides by 30, which keeps the daily rate consistent from month to month. The annualized method divides rent times 12 by 365. Leases usually name one — check yours, because the result can differ by a few dollars.
Which method should you use?
Whatever the lease says. If the lease is silent, the 30-day method is the most common and the easiest for a tenant to verify. Some states and local ordinances specify a method for certain situations, so confirm local rules before you rely on a single approach.
Frequently asked questions
- Does the move-in day count as a full day of rent?
- In the most common approach, yes — the tenant pays from the day they take possession, so the move-in day is an occupied day. Some landlords instead prorate from the day after; the lease controls.
- How do I prorate rent for a move-out?
- Count the days from the 1st through the move-out day, then multiply by the daily rate. The 'occupied days' this calculator derives works for both move-in and move-out situations.
- Why do the three methods give different totals?
- They use different daily rates. Dividing by the actual days in a short month like February produces a higher daily rate than dividing by 30 or by 365/12. The gap is usually a few dollars.