Prorated rent calculator

Prorated rent = full-period rent × chargeable days ÷ billing-period days.

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Monthly rent

Chargeable days

More inputs and assumptions

Days in billing month or convention

Answer

…

Prorated rent = full-period rent × chargeable days ÷ billing-period days.

More results

Precision and calculation record

Decimal places in numeric results and text downloads

Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

Saved scenario

Save the current answer, then change an input to compare. This clears when you leave.

Formula and assumptions

Enter the day counts required by your lease. This arithmetic does not choose a legal billing convention or calculate calendar dates.

Automatic precision shows money to two decimal places and other numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

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Updated 2026-09-26

Using Prorated rent calculator

Prorated rent = full-period rent × chargeable days ÷ billing-period days.

Enter the day counts required by your lease. This arithmetic does not choose a legal billing convention or calculate calendar dates.

Next: Basic calculator

A worked example

With monthly rent = 1500, chargeable days = 10, days in billing month or convention = 30, the prorated rent is 500.00 (rounded to two decimal places).

Before you use the result

Enter the day counts required by your lease. This arithmetic does not choose a legal billing convention or calculate calendar dates. Calculations keep full browser-number precision. Money amounts are displayed to two decimal places; other results use up to 12 significant digits. Very large values may lose precision.

Example results for monthly rent

These examples use Chargeable days: 10; Days in billing month or convention: 30. They are reference calculations, not recommended settings.

Monthly rent	Prorated rent
750	250.00
1500	500.00
3000	1,000.00

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ToolOctopus. “Prorated rent calculator.” Updated 2026-09-26. https://tooloctopus.com/prorated-rent-calculator.

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