Moving in or out on the first of the month is tidy, but most moves are not. When you take a place mid-month, you should only pay for the days you actually live there, and this free calculator works out that prorated rent exactly. Enter your monthly rent and your move date, and it does the rest, in any currency.

TL;DR: Prorated rent is your monthly rent divided by the days in the month, times the days you occupy the unit. Enter your rent and your move-in or move-out date below to see the amount. Confirm the method your lease uses, since a few use a flat 30-day month.

Free toolProrated rent calculator

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Prorated rent
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This is a template calculation, not legal or financial advice. Confirm the proration method against your lease; a few use a flat 30-day month rather than the actual days.

How proration works

Prorated rent answers a simple question: if you do not live somewhere for a whole month, how much of the month’s rent do you actually owe? The math is a daily rate times the days you occupy the unit.

  • Find the daily rate. Divide the monthly rent by the number of days in that month. In a 30-day month, rent of 1,500 is 50 a day; in a 31-day month it is about 48.39 a day.
  • Count your days. If you move in on the 10th of a 30-day month, you occupy the 10th through the 30th, which is 21 days. If you move out on the 10th, you occupied the 1st through the 10th, which is 10 days.
  • Multiply. Daily rate times days occupied is your prorated rent for that month.
Days-in-the-month vs a flat 30-day month
Two divisors are common. Days in the month divides by the real length of the month (28 to 31 days), so the daily rate shifts slightly month to month; this is the most precise and widely used method. A flat 30-day month always divides by 30, which is simpler and shows up in some leases and in commercial practice. They give slightly different answers in months that are not 30 days long, so use whichever your lease names, and default to days-in-the-month if it is silent.

When proration matters

Proration comes up most at move-in, when you sign a lease that starts partway through a month, and at move-out, when your tenancy ends mid-month. In both cases you should pay only for the days you occupy. Note that at move-out the deciding factor is usually your notice period, not the proration itself: if your notice runs to the end of the month, you may owe the full month even if you leave early.

Get it in writing

If your landlord agrees to prorate the first month, put the amount and the method in the lease or a signed addendum before you move in. It avoids a dispute later, and it makes clear whether the deposit, the first full month, and the prorated month are all due at signing or spread out.

This tool is general information, not legal or financial advice; leases and local rules vary, so confirm the proration terms against your lease. Last reviewed July 2026.

Related: How much rent can you afford? · Apartment viewing checklist · Questions to ask a landlord

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References

  1. Consumer Financial Protection Bureau, help for renters: https://www.consumerfinance.gov/housing/housing-insecurity/help-for-renters/
  2. USA.gov, Rental housing and tenant rights: https://www.usa.gov/rental-housing