Free tool
Pro-rata rent calculator
Moving in or out mid-month? Work out in seconds how much rent you owe, in proportion to the days you actually stay.
Free · No sign-up · Instant result
€
Counts both the first and the last day of your stay.
What you pay —
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How to calculate pro-rata rent
When a tenancy starts or ends mid-month, rent is paid in proportion to the days actually stayed, not for the whole month. The formula is simple:
monthly rent × (days stayed ÷ days in the month)
Example: with €600 rent and a move-in on the 15th of a 30-day month, you stay 16 days. You pay 600 × 16 ÷ 30 = €320. Plinthos works this out automatically when you create the tenancy.
Frequently asked questions
Pro-rata rent, made clear
How is rent calculated if I move in mid-month?
You pay in proportion to the days: the monthly rent divided by the days in the month, times the days you actually stay. Move in on the 15th of a 30-day month and you stay 16 days (the 15th to the 30th, inclusive).
Is the move-in day counted?
Yes. The move-in day counts: from the 15th to the 30th of a 30-day month is 16 days, not 15.
What if I move out mid-month?
You pay from the start of the month to your move-out day, inclusive: rent × (move-out day ÷ days in the month).
Does it work for February or 31-day months?
Yes. The calculation uses the real number of days in the month you pick (28, 29, 30 or 31), so the amount is always correct.
Manage rent and payments without doing the maths
Plinthos generates the first pro-rata payment automatically when you add a tenant mid-month, and tracks who has paid.
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