Prorated rent calculator
Work out exactly what to pay or charge for a partial month, whether someone is moving in or moving out mid-month. Free, instant, and nothing to sign up for.
Details
Divides rent by the real number of days in this calendar month.
Prorated rent
$822.63
17 of 31 days in August 2026
- Daily rate $48.39 / day (÷31)
- Days occupied 17
How to calculate prorated rent
To calculate prorated rent, divide the monthly rent by the number of days in the billing period to get a daily rate, then multiply that daily rate by the number of days actually occupied. The billing period is either the real number of days in that calendar month, or a flat 30 days, depending on which convention your lease uses.
prorated rent = (monthly rent ÷ days in billing period) × days occupied
Actual days in the month vs. a 30-day month
Most landlords use the actual number of days in the calendar month: 28 to 31 depending on which month it is. This is the more precise method, since $1,500 rent in a 31-day month works out to $48.39 a day, versus $50.00 a day using a flat 30-day divisor. A 30-day month is simpler to calculate by hand, but it slightly overcharges in every month with 31 days and slightly undercharges in February. Check your lease: many specify one method directly.
Moving in partway through the month
Count from the move-in date through the end of the month, including the move-in day itself. Someone moving in on the 20th of a 30-day month occupies 11 days (the 20th through the 30th), not 10, since the move-in day counts.
Moving out partway through the month
Count from the first of the month through the move-out date, including the move-out day itself. Someone moving out on the 12th occupies 12 days, from the 1st through the 12th.
What if a roommate moves out mid-month?
The roommate leaving pays their prorated share for the days they were there. The remaining full-month rent then needs to be covered by whoever is staying, and by whoever moves in to replace them if someone does. If nobody replaces them straight away, the remaining roommates usually split the gap using their normal method. The rent split calculator works out an equal, income-based, or room-size split for that remaining amount once you know the total.
Common questions
What is the formula for prorated rent?
Prorated rent = (monthly rent ÷ days in the billing period) × days occupied. The billing period is either the actual number of days in that calendar month, or a flat 30 days, depending on which convention your lease uses.
How do you prorate rent for a move-in date?
Count from the move-in date through the end of the month, including the move-in day itself. Divide the monthly rent by the days in the billing period to get a daily rate, then multiply by the days you will actually be there.
How do you prorate rent for a move-out date?
Count from the first of the month through the move-out date, including the move-out day itself. The same daily rate applies: monthly rent divided by the days in the billing period, multiplied by the days occupied.
Should I use actual days in the month or a 30-day month?
Check your lease first: many specify one or the other. Actual days is more precise and is what most landlords use. A flat 30-day month is simpler but slightly overcharges in 31-day months and undercharges in February.
Is my landlord required to prorate rent?
It depends on your lease and on state and local landlord-tenant law, which varies. Many leases specify a proration method directly. If yours does not say, ask your landlord which convention they use before you move in or out.
How do you split a prorated rent bill with roommates who are staying the whole month?
Work out the prorated share for the person moving in or out first, then split the remaining full-month rent among everyone staying the whole month using your usual method. The rent split calculator handles the equal, income, or room-size split for that remaining amount.
Does prorated rent include utilities?
Only if your lease bundles them into one rent figure. If utilities are billed separately, they are usually prorated the same way, by days occupied, but check your lease or ask your landlord since some utility providers bill by usage instead.
Is "prorated rent" the same as "rent proration"?
Yes, they mean the same thing: charging rent for only the days a tenant actually occupies a unit during a partial month, instead of the full monthly amount. This tool works as a prorate rent calculator or a rent proration calculator, whichever term you use.