Rent Proration Calculator
When a lease starts or ends mid-month, you only owe rent for the days you actually hold the unit. Enter the full monthly rent, choose the days in the billing month, and enter the days occupied to see the daily rate and the exact amount due. Three methods are built in so you can match whatever your lease specifies.
How to prorate rent
- Enter the full monthly rent in the Monthly rent field.
- Choose the days in the month from the dropdown (28, 29, 30 or 31).
- Type how many days the tenant occupies the unit into Days occupied.
- Pick a method: Actual days in month, Flat 30-day month or Yearly daily rate.
- Read the daily rate and prorated rent, then use Copy results.
Examples
Move in on the 21st of a 30-day month
Rent $1,500, 30 days in month, 10 days occupied, actual days
Daily rate $50.00, prorated rent $500.00
Five days in a 31-day month (uneven daily rate)
Rent $2,000, 31 days in month, 5 days occupied, actual days
Daily rate $64.52, prorated rent $322.58
Annualized daily rate method
Rent $1,500, 10 days occupied, yearly daily rate
Daily rate $49.32, prorated rent $493.15
Frequently asked questions
How is prorated rent calculated?
The tool works out a daily rate, then multiplies it by the days occupied. With the actual-days method a $1,500 rent over a 30-day month is $50.00 per day, so 10 days comes to $500.00.
What is the difference between the three methods?
Actual days divides the rent by the real month length (28 to 31). Flat 30-day month always divides by 30 regardless of the month. Yearly daily rate uses the rent times 12 divided by 365, which gives one steady daily figure for every month of the year.
Which method should I use?
Use the one your lease names. The actual-days method is the most common in the US. A flat 30-day rate is simpler and slightly cheaper per day in a 31-day month, while the yearly daily rate spreads the annual rent evenly across all 365 days.
Why can't days occupied exceed the days in the month?
With the actual-days method the month length is the natural cap, so entering more occupied days than the month has raises an error. You cannot occupy 32 days of a 31-day month.
Do the 30-day and yearly methods cap the days too?
No. Only the actual-days method enforces the month-length cap. The flat 30-day and yearly daily methods keep a fixed daily rate, so they will multiply out any number of days you enter.
How are the amounts rounded?
Both the daily rate and the prorated rent are rounded to the nearest cent. The prorated total is computed from the full-precision daily rate before rounding, so it can differ by a cent from multiplying the shown rounded rate yourself.
How do I handle February?
Pick 28 or 29 from the days-in-month dropdown to match a common or leap year. The actual-days method then divides the rent across the shorter month, which raises the daily rate slightly.
Does it include deposits, utilities or late fees?
No. It prorates the base monthly rent only. Security deposits, utilities, parking, pet rent and any fees are separate charges you would add on top.
Is my data private?
Yes. Every calculation runs locally in your browser and nothing is uploaded, so your rent figures never leave your device.
Learn more
- How to prorate rent: the three common methods
Actual days, flat 30-day month and yearly daily rate compared, with worked numbers and how move-in versus move-out timing changes the total.
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