Prorated Rent Calculator

Work out what you owe for a partial month of tenancy. Enter the monthly rent, the number of days in that month, and how many days you'll actually occupy the unit to get the daily rate and the prorated total.

Quick Facts

Formula
Daily rate = Monthly rent / Days in month
Prorated rent = Daily rate x Days occupied.
Two conventions
Actual days vs. flat 30-day month
Leases and property managers may use either divisor; pick the one that matches your lease.

Your Results

Calculated
Daily rent rate
-
Monthly rent divided by the chosen divisor
Prorated rent owed
-
Daily rate x days occupied
Share of the month
-
Days occupied / days in month
Savings vs. full month
-
Full monthly rent minus prorated amount

Ready

Enter the monthly rent, days in the month, and days occupied, then press Calculate.

How the Prorated Rent Calculator works

Prorating rent means charging only for the days a tenant actually occupies a unit during a partial month — typically the move-in month or the move-out month, when the lease start or end date falls somewhere other than the first of the month. Instead of charging a full month's rent for a few days of occupancy, the landlord (or the calculator) breaks the monthly rent down into a daily rate and multiplies it by the number of days occupied.

The formula

There are two standard ways to derive the daily rate:

Actual days in month: Daily rate = Monthly rent / Days in that calendar month (28, 29, 30, or 31)

Flat 30-day month: Daily rate = Monthly rent / 30, regardless of the real month length

Either way, the prorated amount is: Prorated rent = Daily rate × Days occupied. The actual-days method is the more common default because it matches the calendar exactly, but some leases and property-management systems use a flat 30-day divisor for simplicity. The two methods give the same answer in a 30-day month and diverge slightly in 28-, 29-, and 31-day months.

Worked example

Say rent is $1,500 per month and a tenant moves in on the 19th of a 30-day month, so they owe for 12 days (the 19th through the 30th). Using the actual-days method: daily rate = $1,500 / 30 = $50.00, and prorated rent = $50.00 × 12 = $600.00. That's $900.00 less than a full month's rent, reflecting the 18 days the tenant did not occupy the unit.

Move-in versus move-out proration

  • Move-in mid-month: days occupied = the count from the move-in date through the last day of that month.
  • Move-out mid-month: days occupied = the count from the first day of that month through the move-out date.
  • Both apply: if a tenant moves in and out in the same partial period, count only the days actually occupied within that span.

What moves the result most

Days occupied is the dominant factor — doubling the days occupied roughly doubles the prorated rent. The choice of divisor (actual days versus a flat 30) matters most in February (28 or 29 days) and in 31-day months, where it can shift the daily rate by a few cents to a few dollars depending on the rent amount. Always check your lease for a stated proration method before relying on either convention for a real payment.

Frequently Asked Questions

How is prorated rent calculated?
The standard method divides the monthly rent by the number of days in that calendar month to get a daily rate, then multiplies the daily rate by the number of days actually occupied: Daily rate = Monthly rent ÷ Days in month, and Prorated rent = Daily rate × Days occupied. For example, $1,500 rent in a 30-day month gives a daily rate of $50, so 12 days of occupancy costs $600.
What is the difference between the actual-days method and the 30-day method?
The actual-days method divides monthly rent by the real number of days in that month (28, 29, 30, or 31), so the daily rate shifts slightly month to month. The flat 30-day method always divides by 30 regardless of the actual month length, which is simpler but produces a slightly different daily rate in 28-, 29-, or 31-day months. Leases can specify either convention; the actual-days method is the more common default.
Do I prorate rent for both move-in and move-out?
Yes, if either date falls mid-month. For a move-in, days occupied is the count from the move-in date through the end of that month. For a move-out, days occupied is the count from the first of the month through the move-out date. Enter whichever partial-month day count applies to your situation.
Does my lease determine which proration method to use?
Yes. Many leases specify a proration method, or your landlord or property management software may have a default convention. This calculator lets you switch between the actual-days and flat-30-day methods so you can match whichever one your lease or landlord uses, or compare both to see how much they differ.

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