data tool
Prorated rent calculator
Prorated rent is the monthly rent divided by a number of days, times the days the tenant has the home. Leases use three common divisors: the days in that month, a 365 day year, or a 30 day month. Enter the rent and the move in or move out date, and this calculator shows all three so the lease's method can be applied and checked.
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- Runs on your device, nothing is uploaded
- Free, no sign in
- No watermark, no file limit
How it works
- 1
Enter the rent
Type the monthly rent from the lease.
- 2
Pick move in or move out
Move in charges from the date to the end of the month; move out charges from the 1st to the date.
- 3
Enter the date
Type the move in or move out date.
- 4
Compare the three
Read the days charged and the three prorated amounts, and use the one the lease names.
The three methods
By days in that month, the daily rate is the rent divided by 28, 29, 30 or 31, so a day costs more in February than in March. By a 365 day year, the daily rate is the rent times 12 divided by 365, the same every day of the year. By a banker's 30 day month, the daily rate is the rent divided by 30. Each is reasonable; what matters is that the lease names one and both sides use it.
Which one leases usually name
Many residential leases prorate by the actual days in the month, which is easy to explain: if the tenant has 13 of 30 November days, they pay 13/30 of the rent. Property management software often defaults to that method. Commercial leases and some older forms use a 365 day year, so the daily rate is stable. The 30 day method is common where rent is collected by banks or older accounting systems. If the lease says nothing, agree the method in writing before the first payment.
A mid month move in
On $1,650 a month and a move in on 18 November 2026, the tenant has 13 days. By days in the month that is $1,650 divided by 30 times 13, $715. By a 365 day year it is $1,650 times 12 over 365, times 13, $705.21. By a 30 day month it is also $715, because November has 30 days. In a 31 day month the three methods all differ, and in February the days in month method charges the most per day.
A table for one rent
On $2,100 a month, moving in on the 10th: in a 28 day February that is 19 days and $1,425 by days in month, $1,311.78 by a 365 day year and $1,330 by a 30 day month. In a 31 day month, moving in on the 10th gives 22 days: $1,490.32, $1,518.90 and $1,540. In a 30 day month it gives 21 days: $1,470, $1,449.86 and $1,470. The spread between methods is largest in February, which is where disagreements about prorated rent usually start.
Move out and the last month
On a move out, the tenant pays from the 1st of the month to the move out date, both days included, if the lease allows a partial final month. Many leases require notice that ends on the last day of a rental period instead, in which case no proration happens. State law on notice periods varies, and the tenant guides published by state attorneys general, such as California's and Texas's, explain the local rules.
Writing it into the lease
A short clause settles the question: first and last month rent is prorated by the number of days in the month. The AI document generator writes a lease or a move in letter from a description; give it the rent, the move in date and the prorated amount from this calculator so the first invoice and the lease say the same thing.
Limits
- The lease decides which method applies; the tool shows all three.
- The move in or move out day itself is charged.
- No deposit, fees or utilities, and no state specific notice periods.
- A 30 day month caps the charged days at 30, so a 31st day is free under that method.
What it does not do
- It does not tell you which method your state requires, because most leave it to the lease.
- It does not prorate for a mid month rent change.
- It does not store the figures.
Questions people ask
How do I calculate prorated rent?
Divide the monthly rent by the days in that month, a 365 day year's share or 30, then multiply by the days the tenant has the home. For $1,650 rent and 13 days in November, that is $1,650 divided by 30 times 13, which is $715.
Which method is fairest?
The 365 day year charges the same daily rate all year, so no month is cheaper or dearer per day. The days in month method is simplest to explain on an invoice. The 30 day method favours the tenant in 31 day months. Fairness matters less than agreeing one method in the lease.
Is prorated rent required by law?
Generally not. Most US states leave it to the lease whether a partial first or last month is prorated and how. Some states have rules for specific situations, such as rent after a tenant dies or a unit becomes uninhabitable, so check your state's tenant guide.
Is the move in day charged?
Usually yes, because the tenant has the keys that day. The calculator counts the move in day and every day to the end of the month, or the 1st of the month through the move out day. If the lease charges from the day after move in, take one day off.
How do I prorate rent in February?
By days in month, divide by 28, or 29 in a leap year, so each day costs more than in other months. By a 365 day year the daily rate is the same as any other month. On $2,100 rent moving in on 10 February 2027, the days in month method gives $1,425 for 19 days.
Should the second month be full rent?
Yes, once the first partial month is prorated, rent is paid in full from the 1st of each following month. Some landlords instead collect a full first month and prorate the second; the total is the same, but the lease should say which.
Write the move in letter
Take what you made here into documents.
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Background reading: the question page on this.
Written and checked by the OneCraft team. Last checked .