Prorated Rent Calculator

The short answer

Prorated rent is a daily rate times the days you have the unit. The daily rate is usually worked out one of three ways: the rent divided by the days in that month, the rent divided by 30, or the rent times 12 divided by 365. For $1,800 rent and a move-in on Oct 20, 2026, those give $696.77, $720 and $710.14.

Your lease decides which method applies. The calculator shows all three, so you can check the number on your first or last bill.

How to use the calculator

1. Pick moving in or moving out.
2. Enter your monthly rent.
3. Pick your move date. Moving in: the first day you have the keys. Moving out: your last day in the unit.
4. Pick the method your lease uses. If it doesn’t say, leave it on days in the month and compare the three results.

The calculator assumes rent is due on the 1st. Use Copy link to send the result to your landlord or a roommate.

Prorated rent by method

What a mid-month move-in costs for $1,500 a month, in months of different lengths:

The longer the month, the less a day costs with the days-in-the-month method. The 30-day method charges the same daily rate every month, so it costs more in 31-day months and less in February.

How we calculate

• Days: we count the calendar days you have the unit in that month, including the move-in day and the move-out day. Moving in, that’s from your move-in day to the end of the month. Moving out, it’s from the 1st through your last day.
• Daily rate: the rent divided by the days in that month, the rent divided by 30, or the rent times 12 divided by 365. The yearly method always divides by 365, even in a leap year, so its daily rate is a touch higher than a 366-day count would give; the days-in-the-month method is the one that counts February’s extra day.
• Prorated rent: the daily rate times the days, never more than a full month’s rent. Moving in on the 1st or out on the last day covers the whole month, so there’s nothing to prorate.

We don’t round the daily rate before multiplying, so the result can differ by a cent from a bill that does.

Worked examples

Example: Moving in on the 20th

What we know

• Rent: $1,800 a month, due on the 1st
• Move-in date: Oct 20, 2026
• Method: Days in the month

How it works out

1. Days: from the move-in day to the end of a 31-day month = 12 days.
2. Daily rate: $1,800 ÷ 31 = $58.06 a day.
3. Prorated rent: $58.06 × 12 = $696.77.

$696.77 for 12 days.

Example: Moving out in February

What we know

• Rent: $1,800 a month, due on the 1st
• Move-out date: Feb 10, 2027
• Method: 30-day month

How it works out

1. Days: from the 1st through the move-out day = 10 days.
2. Daily rate: $1,800 ÷ 30 = $60 a day.
3. Prorated rent: $60 × 10 = $600.

$600 for 10 days.

What leases and the law say

Proration is mostly a matter of your lease, but a few rules show up often:

• HUD-assisted housing: HUD’s handbook for multifamily programs tells owners to divide the tenant’s rent by the actual number of days in the month and multiply by the days the tenant will live in the unit.
• Day-to-day rent: Florida, Arizona and Oregon law say that unless the lease says otherwise, rent is uniformly apportionable from day to day.
• Ending a month-to-month tenancy: in California (Civil Code 1946), when a tenancy ends with notice, rent is due up to and including the termination date.
• Servicemembers: under the Servicemembers Civil Relief Act, rent for the time before an early termination takes effect is paid on a prorated basis.

These are examples, not a complete list. Your lease and your state’s law decide what you owe.

If you’re comparing a move-in special at the same time, work out the prorated amount first and the concession second. They change different months of rent.