Prorated Rent Calculator
Calculate prorated move-in and move-out rent using calendar days, 30-day banker rules, or annual daily rates. Your work stays on this device whenever possible.
How to use Prorated Rent Calculator
- Enter the 'Monthly Rent ($)', then pick the 'Month' and 'Year' of the partial period.
- In 'Calculation Scenario' choose 'Move-In Mid-Month', 'Move-Out Mid-Month' or 'Custom Intra-Month Range'.
- Fill 'Move-In Day' and, where shown, 'Move-Out Day'; the calendar highlights the occupied days.
- Select a 'Proration Formula Method': exact calendar days, the 30-day rule, the average month or the annualized daily rate.
- Open the amenities panel for parking, pet rent, storage, utilities or a one-time key fee, then press 'Calculate Prorated Rent'.
Worked example
Set rent to 1,800, October 2026, scenario 'Move-In Mid-Month', move-in day 12. Occupied days are 31 − 12 + 1 = 20. Exact calendar days gives 1,800 ÷ 31 × 20 = 1,161.29. The 30-day rule gives 1,800 ÷ 30 × 20 = 1,200.00. The annualized rate gives 1,800 × 12 ÷ 365 × 20 = 1,183.56.
When to use this tool
- A landlord preparing the first invoice for a tenant who collects keys on the 12th.
- A tenant verifying a partial-month charge before signing the lease.
Important limitations
Calculates proportional base rent according to standard lease conventions. Local statutory tenancy laws, security deposits, lease initiation fees, and custom lease covenants should be verified against your formal lease contract.
Comparing alternatives
Other options for prorated rent calculator include Calculator.net, Rent.com, DoorLoop, ApartmentGuide.
ToolkitPoint is not affiliated with those services.
Frequently asked questions
Is the move-in day counted?
Yes, both ends are inclusive. Moving in on the 12th of a 31-day month gives 31 − 12 + 1 = 20 occupied days. If your lease excludes the last day, subtract one from the day count yourself.
Which method matches my lease?
The lease and local rules decide, not the tool. Exact calendar days changes the daily rate month to month, while the 30-day rule uses the same rate in every month.
Can it span two months?
No. Each run covers a single calendar month. For a stay that crosses a month end, calculate each month separately with its own start or end day, then add the two prorated amounts together yourself.
How are extra fees handled?
Parking, pet rent, storage and utilities are prorated with the same method and days as the rent. The one-time move-in or key fee is added as a flat amount.
What happens with an impossible day?
Days are clamped to the month length, so 31 in a 30-day month becomes 30. At least one occupied day is always charged, and leap-year February uses 29 days.