Prorated Rent Calculator

Estimate a partial month's rent

1. Select the currency and enter the monthly rent without thousands separators. A dot or comma can mark the decimal part, up to the selected currency's precision.
2. Enter the first and last charged days in the same calendar month. Use the dates you intend to charge, including both endpoints; the calculator does not decide whether a move-in or move-out day should be charged.
3. Calculate, then check the dates, counted days and month length beside the estimate. Copy keeps that context with the amount. Editing a field removes the old result.

Why the month and endpoints matter

The actual-month method multiplies monthly rent by charged days divided by days in that calendar month. A 1500 monthly rent charged from September 16 through September 30 covers 15 of 30 days, giving 750. A full calendar month returns the full monthly rent.

Both charged dates count. September 15 through September 30 is 16 days, while the 16th through the 30th is 15. The same first and last date means one charged day. These are calendar dates, so a daylight-saving clock change does not add or remove a charged day.

February can have 28 or 29 days. For a monthly rent of 1450, February 15 through the month's end gives 750 in 2024 and 725 in 2025. The difference comes from both the counted days and the month's actual length.

Changing currency keeps your typed number and treats it as an amount in the new currency; it does not exchange money. An amount with decimal places must be re-entered if the new currency does not allow them. Changing the page language changes presentation, not the currency or dates.

Check a fraction and its rounding

At USD 1000 per month, August 20 through August 31 covers 12 of 31 days. The calculation is 1000 × 12 ÷ 31, giving USD 387.10 after final rounding. Multiplying an already rounded daily amount can give a different total.

For EUR 0.01 over 15 of 30 days, the unrounded share is EUR 0.005 and rounds up to EUR 0.01. One day out of 31 at that monthly amount rounds to EUR 0.00; a note identifies the positive share that rounded to zero.

For a last-month estimate, enter the month's first day and the agreed last charged day. For a first-month estimate, enter the agreed first charged day and the month's last day. The calculator uses the dates you enter without inferring either from when someone sleeps at or leaves the property.

Confirm the method before relying on the estimate

This calculator estimates one calendar-month portion using actual days. Some agreements use a fixed 30-day divisor, annual rent divided by 365, a different billing cycle or another rounding rule. Confirm the applicable method and charged dates against your agreement and applicable rules; this estimate does not determine a legal amount due.

Dates must be valid, ordered and in the same calendar month, within years 0001 through 9999. Earlier dates use the Gregorian calendar extended backwards, not a reconstruction of historical local calendars. Split-month billing cycles and multi-month totals are outside this calculator's scope.

Monthly rent can be zero through 1000000000 in the selected currency. The final amount is rounded once to the currency's supported decimal precision, with exact halves rounded up. There is no rounded daily-rate intermediate, currency conversion or special cash-rounding increment. Deposits, fees, tax and arrears are separate.

Your calculation

Calculation takes place in your browser. This tool does not add input uploads or save your values between visits. Copy writes the summary to your clipboard only when requested; if clipboard access is unavailable, selected text lets you copy it manually. Existing site services still follow the site privacy policy.