Prorated Rent Calculator
Moving in mid-month? This calculator splits the rent fairly: enter the monthly rent, the number of days in the billing month, and the days you will actually occupy — you get the prorated amount under both common methods so you and the landlord can agree on one.
Two proration methods
Actual-days method: divide the monthly rent by the real number of days in that month (28–31) and multiply by occupied days. Most states default to this when leases are silent, and it is the fairest reading of the lease.
Banker's (30-day) method: always divide by 30. It is simpler and written into some leases and property-management contracts — always check the lease first, because the two methods can differ by a few percent.
Frequently asked questions
Move-in vs move-out — any difference?
Logic is identical; only the occupied-day count changes. For move-out, count the days through the day you hand back keys per your lease.
Which method should I use?
Whatever the lease says. If silent, the actual-days method is the common default and easiest to defend.
Related tools
- Proration conventions: standard US residential leasing practice.
Last updated: 2026-09-08