Prorated Rent Calculator
Estimate rent for a partial month by move-in date, move-out date, or a custom billing period. Compare the actual-days and fixed 30-day methods before you use the amount.
- Inclusive date count
- Two methods compared
- No sign-up required
Calculate rent for a partial month
Use the method named in the lease or provided by the landlord. Both the first and last selected dates are counted as billable days.
Prorated rent
| Method | Daily rate | Rent due |
|---|---|---|
| Actual days | $0.00 | $0.00 |
| 30-day month | $0.00 | $0.00 |
How to calculate prorated rent
Prorated rent is a partial-month charge based on the number of days a tenant is responsible for rent. It is commonly used when a lease begins after the first day of a month, ends before the last day, or assigns a shorter billing period.
Actual-days formula
Monthly rent ÷ calendar days in month × billable days
The divisor changes between 28, 29, 30, and 31 depending on the selected month.
Fixed 30-day formula
Monthly rent ÷ 30 × billable days
The same divisor is used for every month, including February and 31-day months.
Example: moving in on the 12th
Suppose monthly rent is $1,800 and the tenant moves in on the 12th of a 31-day month. Counting the move-in date through the 31st gives 20 billable days.
Using actual calendar days: $1,800 ÷ 31 × 20 = $1,161.29. Using a fixed 30-day month: $1,800 ÷ 30 × 20 = $1,200.00.
Which days does this calculator count?
The start and end dates are both included. For a move-in calculation, the billing period runs from the move-in date through the last calendar day of that month. For a move-out calculation, it runs from the first day of the month through the move-out date. Custom periods must begin and end in the same calendar month.
Actual-days vs. 30-day proration
Neither formula is automatically correct for every rental. The lease, written property policy, and applicable rules should determine which one is used.
Actual days in the month
This method reflects the exact length of the selected calendar month. The daily rate is lower in a 31-day month and higher in February.
Fixed 30-day month
This method keeps the daily rate consistent from month to month. It can produce a different partial-month total than the actual-days method.
Check these details before collecting or paying
Confirm the billing dates
Check whether possession begins on the lease start date and whether rent continues through the move-out date. A one-day difference changes the total.
Read the proration clause
The lease may name the daily-rate method, define a 30-day rental month, or state how partial periods are handled.
Keep other charges separate
Security deposits, utilities, parking, pet charges, concessions, and one-time fees are not included unless you add them separately.
Put the calculation in writing
Record the monthly rent, divisor, billable dates, day count, and total so both parties can review the same calculation.
Results are rounded to the nearest cent and are intended for general planning. This calculator does not include deposits, recurring fees, utilities, credits, late charges, taxes, or lease concessions. Confirm every amount against the lease and applicable requirements before payment or collection.