🏠 Prorated Rent Calculator for a Partial Month
By Shihab Mia · Updated 2026-07-02
This is an estimate for general information only and is not legal or financial advice. Proration methods vary by lease and by local landlord-tenant law, so confirm the method in your lease before relying on a figure.
Counts from this day through the last day of that month, inclusive.
Only used by the actual-month method.
Estimate only, not legal or financial advice. Proration methods vary by lease and by local landlord-tenant law. Confirm which method your lease specifies before you rely on a figure.
This prorated rent calculator works out the rent you owe for a partial month when you move in or out mid-month. With the default numbers (a $1,500 monthly rent, the actual-month method, and 10 days occupied in a 30-day month), the daily rate is $50 and the prorated rent due is $500. Enter your own rent and either a move-in date or a number of days occupied to get your exact figure.
What is the Prorated Rent Calculator?
Prorated rent is the fair share of a full month's rent that covers only the days you actually occupy the home. When you move in on the 21st or move out on the 15th, charging a whole month would not be fair, so the rent is split down to a daily rate and multiplied by the days you are responsible for. A prorated rent calculator removes the guesswork by doing that division and multiplication for you and showing every number it used.
The key decision is which day count to divide by, because that sets the daily rate. There are three common methods. The actual-month method divides the monthly rent by the real number of days in that specific month, so the daily rate is slightly higher in February and slightly lower in a 31-day month. The 30-day banker method always divides by 30 for consistency regardless of the calendar month. The 365-day year method multiplies the monthly rent by 12 and divides by 365 to get a flat daily rate that is identical every month of the year.
Once you have the daily rate, the math is simple: prorated rent equals the daily rate times the number of days occupied. For a move-in, count from your move-in day through the last day of that month, inclusive. So a move-in on June 21 in a 30-day month means 30 minus 21 plus 1, which is 10 days. For a move-out, you typically count from the first of the month through your last day in the home. This calculator lets you type the days directly or pick a move-in date and it counts the days for you.
Different landlords and leases legitimately use different methods, and the choice can change your bill by a few dollars. On a $1,500 rent, the actual-month method in a 30-day month gives a daily rate of $50, the 365-day method gives about $49.32 a day, and February with 28 days pushes the actual-month rate up to about $53.57. None of these is wrong on its own; what matters is that your lease and your landlord agree on one method and apply it consistently. Always check your lease, because that is the number a court would look at first.
Proration usually applies only to the base rent, not to one-time charges like a security deposit, an application fee, or pet fees, which are generally charged in full. If your first month includes both a partial month and utilities or parking that are billed monthly, ask whether those extras are prorated too, since practice varies. Using a partial month rent calculator before you sign helps you check the landlord's figure and budget the exact cash you need on move-in day.
When to use it
- Checking the prorated rent your landlord charged for a mid-month move-in before you pay it.
- Budgeting the exact first-month cash you need when your lease starts partway through the month.
- Working out the final partial-month rent when you move out before the end of a month.
- Comparing the actual-month, 30-day banker, and 365-day methods to see which your lease should use.
- Settling a shared apartment where a roommate joins or leaves mid-month and owes only part of the rent.
- Confirming a daily rent rate so you can prorate a few extra days at the end of a notice period.
How to use the Prorated Rent Calculator
- Enter your full monthly rent.
- Choose a proration method: days in the actual month, a 30-day banker month, or a 365-day year.
- Pick whether to enter a move-in date or a number of days occupied.
- If you enter a date, the tool counts from that day through the end of the month; if you enter days, it uses your number directly.
- For the actual-month method, confirm the days in the month (28 to 31) so the daily rate is right.
- Read the prorated rent due, the daily rate, the days occupied, and the days in the month, then use Copy summary to save it.
Formula & method
Worked examples
You move in on June 21 with a $1,500 monthly rent, using the actual-month method (June has 30 days).
- days occupied = 30 - 21 + 1 = 10
- daily rate = 1,500 / 30 = $50.00
- prorated rent = 50.00 x 10 = $500.00
Result: Prorated rent due: $500.00 (daily rate $50.00, 10 days of 30)
You move out on March 15 with a $2,000 monthly rent, using the actual-month method (March has 31 days), so you occupy the first 15 days.
- days occupied = 15 (the 1st through the 15th)
- daily rate = 2,000 / 31 = $64.5161 per day
- prorated rent = 64.5161 x 15 = $967.74
Result: Prorated rent due: $967.74 (daily rate about $64.52, 15 days of 31)
Your lease uses the 30-day banker method. Rent is $1,200 and you occupy 20 days.
- daily rate = 1,200 / 30 = $40.00
- prorated rent = 40.00 x 20 = $800.00
- The banker method ignores the real day count, so a 28 or 31 day month gives the same rate.
Result: Prorated rent due: $800.00 (daily rate $40.00, 20 days of 30)
Daily rent rate on $1,500 rent by proration method
| Method | Divisor | Daily rate | 10 days occupied |
|---|---|---|---|
| Actual month (30 days) | 30 | $50.00 | $500.00 |
| Actual month (31 days) | 31 | $48.39 | $483.87 |
| Actual month (February, 28) | 28 | $53.57 | $535.71 |
| 30-day banker month | 30 | $50.00 | $500.00 |
| 365-day year | 365 (rent x 12) | $49.32 | $493.15 |
Move-in date to days occupied in a 30-day month
| Move-in day | Formula | Days occupied |
|---|---|---|
| 1st | 30 - 1 + 1 | 30 (full month) |
| 10th | 30 - 10 + 1 | 21 |
| 15th | 30 - 15 + 1 | 16 |
| 21st | 30 - 21 + 1 | 10 |
| 30th | 30 - 30 + 1 | 1 |
Common mistakes to avoid
- Using the wrong number of days in the month. The actual-month method divides by the real day count, which is 28, 29, 30, or 31. Using 30 for February inflates the daily rate the wrong way. If your lease says to use the actual month, match the calendar exactly.
- Forgetting to count the move-in day itself. For a move-in you count from your move-in day through the last day of the month, inclusive. A move-in on the 21st of a 30-day month is 10 days, not 9. Leaving off the plus one undercounts by a day.
- Assuming every landlord uses the same method. The actual-month, 30-day banker, and 365-day year methods give slightly different daily rent rates. Check which one your lease specifies rather than assuming, because the difference can be a few dollars.
- Prorating the security deposit or fees. Proration normally applies only to the base rent. Security deposits, application fees, and pet fees are usually charged in full, so do not run them through the partial month rent calculator.
- Mixing up move-in and move-out day counts. A move-in counts forward from your first day to the end of the month. A move-out counts from the first of the month to your last day. Applying the move-in formula to a move-out (or the reverse) gives the wrong number of days.
- Rounding the daily rate too early. Round only the final prorated amount to two decimals. Rounding the daily rate first, then multiplying, can throw the total off by a few cents on longer stays.
Glossary
- Prorated rent
- The share of a full month of rent that covers only the days you actually occupy the home during a partial month.
- Daily rate
- The monthly rent divided by a day count (the days in the month, 30, or 365/12), used to price each day of occupancy.
- Days occupied
- The number of days you are responsible for rent in the partial month, counted inclusively.
- Actual-month method
- Prorating by dividing the rent by the true number of days in that specific calendar month.
- 30-day banker month
- A convention that treats every month as 30 days so the daily rate is the same regardless of the calendar.
- 365-day year method
- A flat daily rate found by multiplying monthly rent by 12 and dividing by 365, identical every month.
- Move-in date
- The first day you take possession of the home, from which days occupied are counted through the end of the month.
- Base rent
- The recurring monthly rent charge, separate from deposits and one-time fees, and the amount that is normally prorated.
Frequently asked questions
How do you calculate prorated rent?
Divide the monthly rent by a day count to get a daily rate, then multiply by the days you occupy. Using the actual-month method on a $1,500 rent in a 30-day month, the daily rate is 1,500 / 30 = $50, so 10 days is $500. This prorated rent calculator does that automatically.
What is the most common way to calculate prorated rent?
The two most common are the actual-month method (divide rent by the real days in that month) and the 30-day banker method (always divide by 30). Some leases use a 365-day year method. Your lease should state which one applies.
How do I calculate prorated rent for a move-in date?
Count from your move-in day through the last day of that month, inclusive: days occupied = (last day of the month) - (day of month) + 1. A move-in on the 21st of a 30-day month is 30 - 21 + 1 = 10 days. Multiply by your daily rent rate.
Is prorated rent based on 30 days or the actual month?
It depends on the method your lease uses. The 30-day banker method always divides by 30, while the actual-month method uses the real day count, which changes the daily rate slightly in February and 31-day months. Neither is wrong if the lease specifies it.
How is prorated rent calculated for a move-out?
For a move-out you usually count from the first of the month through your last day in the home, then multiply that number of days by the daily rate. In this partial month rent calculator, enter that day count directly in the days occupied field.
Do you prorate rent for the first month or the last month?
Either can be prorated. If you move in mid-month, the first month is prorated; if you move out mid-month, the last month is prorated. Some leases prorate the second month instead and charge a full first month, so check your agreement.
Does prorated rent include the security deposit or fees?
No. Proration normally applies only to the base rent. Security deposits, application fees, and pet fees are typically charged in full and are not run through a prorated rent calculation.
Why does my prorated rent differ from my landlord by a few dollars?
Small differences usually come from a different proration method. The actual-month, 30-day banker, and 365-day year methods produce slightly different daily rent rates. Confirm which method the lease uses so both figures match.
Is a landlord legally required to prorate rent?
Rules vary by state and city, and some leases address it directly. Many landlords prorate as a matter of practice, but it is not universally mandated. Review your lease and local landlord-tenant law, and see the sources below.
How do I prorate rent for February?
With the actual-month method, divide by 28 (or 29 in a leap year). On a $1,500 rent, February gives 1,500 / 28 = about $53.57 a day. The 30-day banker and 365-day year methods keep the daily rate the same as any other month.
Sources
- Tenant rights and how to resolve a dispute with your landlord , USAGov (U.S. federal government)
- Housing help: rental assistance and tenant resources , USAGov (U.S. federal government)