Prorated Rent Calculator
Enter your monthly rent and the date your tenancy starts or ends mid-month to find the exact amount owed. Choose from three standard proration methods, the calculator shows daily rate, days occupied, and a full step-by-step breakdown so both landlord and tenant can verify the number.
What is prorated rent?
Prorated rent is the portion of the monthly rent that covers only the days a tenant actually occupies the property during a partial month. When a lease starts or ends mid-month, neither landlord nor tenant should pay for days outside the tenancy. Proration converts the flat monthly charge into a per-day rate and multiplies by the days of actual occupancy, so both parties pay a fair share. The word "prorated" simply means proportionally divided; it is identical to "pro-rated" and "pro rata" in this context.
How to calculate prorated rent
The standard approach has three steps. First, find the daily rent by dividing the monthly amount by a divisor (actual days in the month, 30, or 365 / 12 depending on the method your lease specifies). Second, count the days of occupancy: for a move-in, count from the move-in date through the last day of that month, inclusive; for a move-out, count from the 1st through the move-out date, inclusive. Third, multiply the daily rate by the days occupied. For example, a $1,500 rent with a July 10 move-in gives a daily rate of $1,500 / 31 = $48.39, and occupancy of 22 days (July 10 to July 31), yielding $1,500 / 31 x 22 = $1,064.52.
Which proration method should you use?
Always defer to what your lease says. Most residential leases in the United States default to the actual-days method because it is the most transparent and tied to real calendar data. The 30-day method is simpler and occasionally specified in older leases; it slightly over-charges tenants in February and slightly under-charges them in 31-day months. The annual method, dividing yearly rent by 365, is common in commercial real estate because it smooths month-length differences across the year. If your lease is silent on the method, the actual-days approach is the safest default and the one most likely to be upheld if a dispute arises.
Move-in vs. move-out proration
The principle is the same whether you are moving in or moving out, but the day-count differs. For a move-in, the tenant owes rent from the first day they are entitled to access the property (often the day keys are handed over) through the last day of that month. For a move-out, the tenant owes from the 1st of the final month through the last day they occupy the unit, usually the lease end date or the day they hand the keys back. Both landlord and tenant should confirm in writing which day is included and which method is used before any money changes hands.
Proration method comparison
| Method | Divisor | $1,500 rent / daily rate | Common usage |
|---|---|---|---|
| Actual days (28-day Feb) | 28 | $53.57 / day | Residential leases |
| Actual days (30-day month) | 30 | $50.00 / day | Residential leases |
| Actual days (31-day month) | 31 | $48.39 / day | Residential leases |
| 30-day fixed | 30 | $50.00 / day | Simple residential |
| Annual (365 / 12) | 30.4167 | $49.32 / day | Commercial leases |
How the three standard methods divide a $1,500/month rent across different month lengths.
Frequently asked questions
Does the move-in day count as an occupied day?
Yes, in almost all cases. The first day of occupancy is included in the day count, so a July 10 move-in is counted as 22 days (July 10 through July 31). Some leases specify otherwise, so check your agreement if you are unsure.
Does the move-out day count as an occupied day?
This varies by lease and local law. Many leases count the move-out date as the last day of occupancy and include it in the proration. Others consider the property vacated at midnight on the final day and do not charge for it. Your lease should specify; if it does not, the convention in your state often governs.
Is a landlord required to prorate rent?
No federal law mandates rent proration, and state laws vary. However, most landlords prorate rent as a matter of fairness and to attract tenants. Requiring a full month of rent for a partial month of occupancy is legal in many states but may be unusual and negotiable. Always agree on the prorated amount in writing before signing or paying.
What if my move-in date is the 1st?
If you move in on the first day of the month, there is nothing to prorate: you owe the full monthly rent. Proration only applies when occupancy starts or ends part-way through a calendar month.
How does the 30-day method differ from the actual-days method?
The 30-day method always divides monthly rent by 30, regardless of how many days are in the actual month. For a 31-day month (January, March, May, July, August, October, December) this gives a slightly higher daily rate than the actual-days method, which benefits the tenant. For February it gives a lower daily rate, which benefits the landlord. Over a full year, the differences roughly cancel out, but for a single partial month the methods can produce results a few dollars apart.
Can prorated rent affect my security deposit?
Usually not directly. Security deposits are typically calculated on the full monthly rent, not the prorated first-month amount. However, landlord practices vary, so confirm with your landlord whether the deposit is based on monthly rent or some other figure.
What is the annual proration method and when is it used?
The annual method divides the yearly rent (monthly rent times 12) by 365 to get a daily rate. This makes the daily rate constant throughout the year regardless of month length, which simplifies accounting for commercial landlords managing many leases. It is rarely used in standard residential tenancies.