Prorated rent calculator

Work out the rent for a partial month when a tenant moves in or moves out. The math runs in this page in your browser. The numbers you enter stay in your browser and aren't sent to us. This site uses Cloudflare Web Analytics for cookieless visit counts.

Monthly rent (US dollars)

Move type Move-in (counts from the date to the end of the month) Move-out (counts from the 1st to the date)

Date

Method Actual days in that month 365-day year (rent × 12 ÷ 365 per day) 30-day month (rent ÷ 30 per day)

This is an estimate, not legal or tax advice. Check your lease and local rules.

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How it works

Prorated rent is the share of one month's rent for the days a tenant has the unit. The calculator finds a daily rate, counts the days, and multiplies the two.

Days are counted inclusively. For a move-in, the count runs from the move-in date through the last day of that month, so a January 15 move-in counts 17 days. For a move-out, the count runs from the 1st through the move-out date.

Three methods set the daily rate:

Actual days: monthly rent divided by the days in that month (28, 29, 30 or 31, with leap years included).
365-day year: monthly rent times 12, divided by 365. Daily rate = annual rent / 365, so a full 31-day month can come to slightly more than the monthly rent.
30-day month: Daily rate = monthly rent / 30 (each month counted as at most 30 days), so a full February comes to 28/30 of rent (29/30 in a leap year). A move-out on the 31st counts 30 days.

The daily rate is shown to four decimals, and only the final amount is rounded to the cent.