Prorated rent is the rent for a partial month, calculated as a daily rate multiplied by the number of days the tenant is responsible for the property:
Daily rent × billable days = prorated rent
The three common ways to get the daily rate — dividing by the actual days in that month, by a flat 30, or by 365 on an annualized basis — give slightly different answers, and so does the decision to count or skip the final day. Use the method required by applicable law and your lease; the examples below show each method for both a move-in and a move-out so you can check your own numbers. Then compare prorated rent calculations for your dates and download a worksheet.
When landlords prorate rent
Common situations include:
- A lease starts after the first day of the month
- A tenant receives possession before the regular lease start
- A fixed-term lease ends before the last day of a month
- The landlord and tenant agree to an early move-out date
- A credit reduces the days for which rent is charged
Do not assume that moving possessions out early automatically changes the tenant’s legal rent responsibility. The lease, possession date, keys, termination agreement, and local law may matter.
Method 1: Actual days in the month
Divide the monthly rent by the number of calendar days in that month.
Monthly rent ÷ days in month × billable days
Example:
- Monthly rent: $2,100
- Month: September, with 30 days
- Move-in date: September 16
- Billable days, counting September 16 through September 30: 15
Calculation:
$2,100 ÷ 30 = $70 per day
$70 × 15 = $1,050 prorated rent
This method changes slightly from one month to another because February, a 31-day month, and a 30-day month produce different daily rates.
Method 2: A 30-day month
This convention treats every month as 30 days.
Monthly rent ÷ 30 × billable days
For $2,100 in September and 15 billable days, the result is still $1,050. But in a 31-day month it will differ from the actual-days method.
Example for an August 20 move-in:
- Monthly rent: $2,100
- Billable days: 12 if August 20 through August 31 are counted
$2,100 ÷ 30 = $70 per day
$70 × 12 = $840
Using actual August days would produce:
$2,100 ÷ 31 = $67.7419 per day
$67.7419 × 12 = $812.90 after rounding
That $27.10 difference is why the method should be agreed upon before money is due.
Method 3: Annualized daily rent
Multiply the monthly rent by 12, then divide by 365. Use 366 if your agreement specifically uses the actual number of days in a leap year.
Monthly rent × 12 ÷ 365 × billable days
For $2,100 and 12 billable days:
$2,100 × 12 = $25,200 annual rent
$25,200 ÷ 365 = $69.0411 per day
$69.0411 × 12 = $828.49 after rounding
This method keeps the daily rate consistent throughout the year, apart from leap-year treatment.
Which proration method should you use?
Use the method required by the lease and applicable law. If neither dictates one, choose a method, disclose it before signing or amending the agreement, and use it consistently.
| Method | Advantage | Tradeoff |
|---|---|---|
| Actual days | Matches the calendar month | Daily rate changes by month |
| 30-day month | Simple and predictable | Can differ from the real calendar |
| Annualized | Consistent daily rate | Formula is less intuitive |
Record the agreed method before calculating the charge so both parties can check it.
Move-out example, including February and a leap year
For this move-out example, check whether the final day is billable and how many days February has in that year.
Lease ends February 10, 2028 — a leap year, so February has 29 days. Monthly rent is $1,450. The tenant returns the keys on the 10th and the agreement charges through the move-out day, so the billable period is February 1–10 inclusive: 10 days.
| Method | Daily rate | × 10 days | Result |
|---|---|---|---|
| Actual days (29) | $1,450 ÷ 29 = $50.0000 | $500.00 | $500.00 |
| 30-day month | $1,450 ÷ 30 = $48.3333 | $483.33 | $483.33 |
| Annualized (365) | $1,450 × 12 ÷ 365 = $47.6712 | $476.71 | $476.71 |
Two variations to check your assumptions against:
- Same move-out in a non-leap February (2027, 28 days). Actual-days becomes $1,450 ÷ 28 = $51.7857 per day, × 10 = $517.86 — $17.86 more for the identical ten days, purely because the month is shorter. The 30-day and fixed-365-day methods give the same amounts in both examples.
- Final day not charged. If the agreement says the tenancy ends at the start of the 10th (keys back first thing, and the day isn’t charged), the period is February 1–9: 9 days. Actual-days gives $50 × 9 = $450.00. The calculator has a “count the move-out day” toggle for exactly this case.
Some leases specify 366 days for the annualized method in a leap year; the calculator uses 365 year-round, so if your lease says 366, adjust by hand: $1,450 × 12 ÷ 366 = $47.5410 × 10 = $475.41.
How to count billable days
Write down the first and last billable date, then state whether both are included.
The examples count the move-in day: September 16 through 30 is 15 days. For a move-out, confirm whether the agreement charges through the final day. Counting February 10 gives 10 days; ending the billable period on February 9 gives nine. Record the agreed dates rather than assuming that returning keys settles the rent obligation.
A quick way to check your count: the number of billable days for a move-in is days in month − move-in day + 1; for a move-out charged through the last day it’s simply the move-out day number. September 16 move-in: 30 − 16 + 1 = 15. February 10 move-out: 10.
Example:
Prorated rent covers August 20 through August 31, inclusive: 12 calendar days.
Keep that date range alongside the total.
The calculator also caps a result at one full month’s rent. With $2,100 rent and all 31 days of August selected, the raw 30-day calculation would be $2,170; the calculator returns $2,100. That cap is a tool convention, so compare it with the agreed billing method.
How to round prorated rent
Keep several decimal places in the daily rate and round the final total to the nearest cent. Rounding the daily rate first can create a small difference.
For example:
- Precise daily rate: $2,100 ÷ 31 = $67.741935…
- Precise total for 12 days: $812.90322…
- Final charge: $812.90
Record the method and unrounded formula on the worksheet so the calculation can be recreated later.
What to give the tenant
Provide a short written breakdown:
Monthly rent: $2,100
Proration method: Actual calendar days
Billable period: August 20–31, inclusive
Calculation: $2,100 ÷ 31 × 12
Prorated rent: $812.90
Due date: August 20
When the tenant pays, issue a rent receipt identifying the partial period. Then add the charge and payment to the rent ledger so it is not confused with the first full month’s rent.
If the first month is prorated, say so in the rent reminder for the first full month so the tenant doesn’t pay the wrong amount twice.
Next step: pick the method your lease specifies, compare prorated rent calculations for the actual dates, download the worksheet, and attach it to the lease file. For the ongoing tenancy, TenantHub can track the regular rent schedule, receipts, and balances in one place — start free.
