Prorated Rent Calculator

How the prorated rent comparison works

Enter one monthly rent and a move date inside the calendar month you want to check. For a move in, the range starts on the move date and ends on the final day of that month. For a move out, the range starts on the first day and ends on the move date. Both endpoints are included. This focused version does not model billing anniversaries, cross-month partial periods, deposits, late fees, utilities, or payments.

The result deliberately keeps two arithmetic conventions visible. Actual calendar days divides rent by the month's real 28, 29, 30, or 31 days. Fixed 30 days divides by 30 and caps a partial result at the monthly rent. Confirming one method changes the selected estimate and optional paid comparison; it never hides or recalculates the alternative.

February and 31-day months reveal the difference

For $1,200 and a February 16, 2026 move in, 13 included days out of 28 produce an actual-days estimate of $557.14. The fixed-30 estimate is $520.00, a $37.14 difference. In September, September 16 through 30 is 15 of 30 days, so both methods return $600.00. A full calendar month always returns the full monthly rent under both methods.

The displayed daily rate has four decimals for explanation only. The calculator parses integer cents, keeps the fraction exact, multiplies first, and rounds the final amount once, half up to the nearest cent. It does not multiply a prematurely rounded daily display. Calendar-day counting uses validated Gregorian fields rather than elapsed hours, so a daylight-saving change cannot add or remove a day.

Rules vary; this result is not a legal verdict

A lease, local rule, program, or accounting policy may specify a convention or may address whether a partial month is prorated at all. The Minnesota Legislature's §504B.116 is a narrow official example: it requires actual-calendar-day proration for a covered residential final month and limits waiver. It does not define every US rental situation, and this page does not decide whether a particular tenancy is covered.

The Caltrans 11-EX-5 exhibit shows a fixed-30 convention inside one agency program, including an inclusive date and monthly cap. It is not nationwide landlord-tenant law. Its displayed example first rounds a daily amount even though its prose says not to; ToolNeko follows the transparent exact-fraction, final-only rounding rule stated above and does not claim to reproduce that discrepant number.

Optional paid amount and local receipt

If you enter an amount already paid for the selected month, the result subtracts the selected estimate and labels the number “paid above estimate,” “paid below estimate,” or “matches estimate.” Those phrases are arithmetic descriptions—not a promise of a refund, a balance due, or a right to withhold payment. Use the signed comparison to reconcile records, then check the agreement and current official rules that apply.

Copy and the text download contain the monthly rent, move type, included range, both methods, selected estimate, difference, optional paid comparison, source-check date, and the estimate warning. Editing any input clears the prior result and disables its actions until you compare again. Rent, dates, paid amount, result, copied text, and file content remain in the browser; the tool uses no landlord API, account, persistent storage, or third-party calculation service. After the page's required static assets load, a fresh estimate, method confirmation, copy, and text download work offline.

Source scope and review date

Calendar boundaries follow the US Naval Observatory's Gregorian calendar explanation. The Minnesota, Caltrans, and calendar sources above were checked on September 24, 2026. Legal text and agreements can change; follow the current official source for your specific location and situation rather than treating this page as automatic compliance advice.