Prorated Rent Calculator
Work out partial-month rent for a mid-month move-in or move-out, compared across three proration methods.
Daily rate
$0.00
Days occupied
0
Prorated amount
$0.00
Compare all three methods
| Method | Daily rate | Prorated amount |
|---|
How prorated rent is calculated
Prorated rent is the portion of a full month's rent charged for a partial period, typically when a tenant moves in or out mid-month. The calculation always has two steps: work out a daily rent rate, then multiply it by the number of days occupied.
This tool supports three common ways to get the daily rate:
- Days in that month: daily rate = monthly rent ÷ days in the specific calendar month. This is the most accurate method because it matches the real number of days a tenant is billed for.
- 30-day month (banker's): daily rate = monthly rent ÷ 30, regardless of the actual month length. Common in commercial leases because it's simple and consistent year-round.
- 365-day year: daily rate = (monthly rent × 12) ÷ 365. This spreads the annual rent evenly across every day of the year rather than treating months unevenly.
Worked example: a tenant with $1,500 monthly rent moves in on September 10. September has 30 days, so under the days-in-month method the daily rate is $1,500 ÷ 30 = $50.00. The tenant occupies the unit from the 10th through the 30th, which is 21 days (30 − 10 + 1). Prorated rent = $50.00 × 21 = $1,050.00. The 30-day banker's method gives the same $1,050.00 here because September happens to have 30 days. The 365-day method gives a daily rate of $1,500 × 12 ÷ 365 = $49.32, for a slightly lower total of $1,035.62.
When both a move-in and a move-out date are entered and they fall in different calendar months, the calculator prorates the first partial month, charges any full months in between at the full rent, and prorates the final partial month separately — each using the daily rate for its own calendar month under the days-in-month method.
Tip: always check your lease for the proration method it specifies before relying on a number for a payment dispute — landlords are not required to use the most tenant-favorable method.
Prorated Rent Calculator: frequently asked questions
How is prorated rent calculated?
A daily rent rate is worked out (monthly rent divided by the days in that month, by 30, or by 365/12), then multiplied by the number of days the tenant actually occupies the unit that month.
Which proration method should I use?
Most property managers use the actual days-in-month method because it matches the real calendar. The 30-day (banker's) method is common in commercial leases for simplicity. Check your lease for the method it specifies.
Do I count the move-out day as a day occupied?
This calculator counts both the move-in day and the move-out day as occupied days, which is the most common convention. If your lease excludes the move-out day, subtract one day from the result.
What if I move in and out in the same month?
Enter both dates. The calculator prorates only that single partial month rather than charging a full month in between.
Why do the three methods give different amounts?
They use different daily rates. A 31-day month gives a lower daily rate (so a lower prorated charge) under the days-in-month method than under the fixed 30-day method, while the 365-day method spreads a slightly different average daily rate across every month.