Rent for a partial month by days in the month, a 30-day month or a 365-day year
Runs in your browser. Nothing you type is sent anywhere. Updated on 25 Oct 2026.Prorated rent is the monthly rent divided into a daily rate, times the days you occupy. On $1,500 rent, moving in on 20 October gives 12 days: $580.65 by the 31 days in October, $600.00 by a 30-day month and $591.78 by a 365-day year. Your lease decides which method applies.
Under "Partial month", pick Moving in or Moving out.
Enter the "Monthly rent".
Pick the "Move-in date" or "Move-out date"; that day itself is counted.
Read the rent by the days in the month, and compare the "30-day banker's month" and "365-day year" figures.
Press Share result to copy a link to these figures.
When a lease starts or ends partway through a month, most landlords charge rent only for the days you have the keys. The arithmetic is simple, but there are three common ways to get the daily rate, and they give different answers. This calculator shows all three side by side, so you can match the one your lease names or check the figure on your move-in invoice.
Days in the month. The monthly rent divided by the number of days in that calendar month, times the days you occupy. In February the daily rate is higher than in October, because the same rent covers fewer days. This is the method most residential leases use.
30-day banker's month. The rent divided by 30, whatever month it is. It charges more than the first method in a 31-day month and less in February. The result is never more than one full month's rent.
365-day year. Twelve months of rent divided by 365, times the days. The daily rate is the same all year. Leases that name this method use 365 even in a leap year, and so does the calculator.
Which days count. A move-in date counts as a day you pay for, through the last day of the month. A move-out date counts as a day you pay for, from the 1st of the month. The page shows the first and last day it counted, so you can compare it with your lease.
What this calculator does not do: it does not know your lease or your state's rules, and it does not add utilities, pet rent, parking or late fees. Some leases require a full month at move-out regardless of the date, and some landlords roll a short first month into the second month's payment. Read the rent clause of your lease, and ask the landlord in writing if it does not say.
The dates are handled as whole calendar days, so your time zone never changes the count.
Divide the monthly rent by the number of days in that month to get a daily rate, then multiply by the days you will live there, counting the move-in day. For $1,500 in a 31-day month and 12 days, the daily rate is $48.39 and the prorated rent is $580.65. Some leases use 30 days or 365 days instead.
A banker's month treats every month as 30 days, so the daily rate is the monthly rent divided by 30. On $1,500 rent the daily rate is $50 in every month. The method charges a little more than the actual-days method in 31-day months and less in February, and never more than one month's rent.
Usually yes. Most leases charge rent from the day the tenancy begins, so moving in on the 20th of a 31-day month means paying for 12 days, the 20th through the 31st. The calculator counts the move-in day and shows the first and last day it counted, so you can compare it with your lease.
Only your lease can answer that. Many leases require a full month's rent, or written notice such as 30 days, regardless of the move-out date, and some state laws limit what a landlord can charge. The calculator shows what the partial month would cost if proration applies; confirm with your landlord in writing before relying on it.
Under the actual-days method the same monthly rent is spread over only 28 or 29 days, so each day costs more. On $1,400 rent, a day in February is $50.00 while a day in October is $45.16. The 30-day and 365-day methods keep the daily rate the same all year, which is why some leases prefer them.
Whichever method the lease states. Many residential leases do not name one, and landlords most often use the actual days in the month. If yours is silent, ask for the method in writing before you pay, and use the three figures here to check the amount you are asked for.
Formula only: no rates or limits are read from an official source.
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