Prorate Rent Calculator – Moving in or out between rent dates? Enter your rent and occupancy dates to estimate prorated rent across one or more months, compare three calculation methods, and review the math.
Your details
How the methods compare
The bars compare each estimated total with full monthly rent for every calendar month covered. The outlined bar is your selected method; formulas appear under each month’s amounts.
Run the calculation to compare the methods.
Month-by-month breakdown
| Month | Days occupied | Calendar-month | Flat 30-day | Annual |
|---|---|---|---|---|
| Run the calculation to fill this table. | ||||
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Table of Contents
What prorated rent means
Prorated rent is an approximation to the rent on a portion of the rental period. Usually, a calculation is based on a daily rate and the number of billable occupancy days, but the day rate convention and which days are billable may vary based on the lease and local needs. This calculator is based on these assumptions and illustrates several mathematical approaches, but is not intended to tell the landlord what he or she is legally allowed to charge.
This tool is not only for a single-month estimate, but it can also be used for occupancy dates that span across months. It provides a proration for calendar-month for each month, and shows the totals for all three.
Worked example
If you rent a house for $1800 per month, and the dates you booked were January 29 to February 3 (inclusive), then: That’s 3 busy days in January and 3 busy days in February. The calendar-month method estimates $174.19 for January ($1,800 ÷ 31 × 3) plus $192.86 for February ($1,800 ÷ 28 × 3), for a total of $367.05. The flat 30-day method estimates $360.00 ($1,800 ÷ 30 × 6). In a non-leap year, the annual method estimates $355.07 ($1,800 × 12 ÷ 365 × 6). The lease might contain another rule.
How this prorate rent calculator works
Enter the amount of the monthly rent and the first and last date of the tenancy. Start date is included. If mentioned, select either the “Move Out” date, or the method outlined in the lease. This is an estimation and not a legal ruling of how much is due.
Number of days in each calendar month. The daily rate for each month in the date range is the monthly rent divided by that month’s actual length (28, 29, 30 or 31 days). The tool will use that rate for the occupied days of that month and sum the monthly amounts.
Flat 30-day month. The daily rate is calculated as a monthly rate, divided by 30, for each day, accounting for each day of the month, but not each calendar day.
Days in the year. The daily rate is 12 x the monthly rate / 365 or 366 (as appropriate for the calendar year). If the date range spans years, the daily rate for each year will be based on the number of days in that year.
The total for each method is compared to the total monthly rent for each calendar month that reflects the dates. The month-by-month table displays the number of days that the station was operated and all three estimates. You have a mathematical comparison and your lease and local rules dictate which assumptions to use.
When you will need this
- Move-in mid-month. The first rent is paid for days of the first month from the date of rent.
- Move-out mid-month. Your final payment is for the days till your end date, not the entire month.
- Divide a turnover “month. If one tenant moves out on the 15th and another tenant moves in on the 16th, then each tenant is responsible for paying for their own days.
- All forms of accommodation for a short term or longer. For those staying for a portion of a month, a fair share instead of a full month may be charged.
- Verification of a landlord’s claim. When a statement appears out of order, do the calculations yourself before asking about it.
Pro tips
- Check the lease. Check the daily rate calculation and see if the move out date is part of it.
- Verify dates and occupancy. Please confirm start/end dates and indicate if key handover day is included.
- Make comparisons with like. The utility of a calculation depends on its set of assumptions; inquire from the landlord the set of assumptions that were used.
- Keep a record. Make a copy of the calculation summary to record with your rent records the inputs and method.
FAQ
How to calculate rent pro-ration?
Select a per day basis and count the number of days occupied and billable then multiply the number of days by the rate. The calendar-month daily rate is $60 for rent of $1,800 for a 30-day month, occupying 12 days, the rent would be $720. This calculator is used to estimate each month for multiple month occupancy and adds up the estimates.
Is the move-out day a count day?
This is dependent on the terms of the lease and the terms of the move out. You can enter or delete that date, and apply the rule that is suitable to your agreement.
If the rent is split by 30 or split by the days in the month?
They are different calculation conventions and can give different estimates, particularly for February or a 31st day. Don’t assume that a single method is suitable everywhere, rather look at the lease and at the rules.
Can landlords charge for rent pro rata?
The rules differ per jurisdiction and per situation. This Calculator does not offer legal advice. Consult your local housing authority or a knowledgeable tenant/landlord adviser for advice regarding your situation.
Is the last month prorated as well?
It normally does. If you leave before the end of the month and have paid the entire month, you could be eligible for a refund for the days you did not stay the full month, as well.
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Reviewed by: aFreeTools Editorial Team
Last updated: October 02, 2026
Freshness: The formulas used here — rent ÷ days in month × days occupied, rent ÷ 30 × days occupied, and annual rent ÷ 365 × days occupied — were checked against worked examples for 28-, 30- and 31-day months and for leap years.
Disclaimer – This prorate rent calculator is an educational and planning tool. It does not provide legal, financial or tenancy advice, and its output is a mathematical estimate rather than a ruling on what is owed. Prorating conventions, notice periods and deposit rules vary by lease and by jurisdiction. Always read your tenancy agreement and, where a dispute matters, seek advice from a qualified professional.