ProRata CalculatePro Rata Rent Calculator — Part-Month Rent, Both Methods Shown
Work out the rent for part of a month. Enter the monthly rent and your move dates to see the part-month amount by both methods landlords use.
Pro Rata Rent Calculator
Enter the monthly rent, then either the move dates or a plain day count.
| Method | Daily rate | For — days |
|---|---|---|
| Annual method (rent × 12 ÷ 365) | — | — |
| Calendar-month method (rent ÷ days in month) | — | — |
The two methods, honestly compared
The annual method treats rent as a yearly sum paid in monthly instalments: monthly rent × 12 ÷ 365 gives a daily rate that never changes, in February or July. The calendar-month method treats each month’s rent as buying that month: daily rate is rent ÷ days in the month, so a day in February (28 days) costs more than a day in January (31). Over a whole year the methods agree; over a short part-month they differ by a few pounds. Councils and housing associations lean to the annual method; private letting agents lean to the calendar method; student and holiday lets often use a flat weekly rate instead. None is “the law” — your tenancy agreement is, so read its rent clause before you challenge a figure, and bring both calculations to the conversation.
A worked example: £975 a month, in on the 10th of March
March has 31 days, so moving in on the 10th leaves 22 days to pay for (10th to 31st inclusive). Annual method: £975 × 12 ÷ 365 = £32.05 a day, × 22 = £705.21. Calendar method: £975 ÷ 31 = £31.45 a day, × 22 = £691.94. The gap is £13.27 — small, but real, and exactly the sort of sum that disappears into a “miscellaneous” line on a move-in statement unless you have already run both numbers. Run your own dates above before you query any statement, and quote the agent’s own method back to them if their figure matches neither.
Bills, council tax and broadband for a part-month follow the same logic but are usually priced by the provider on actual days; the date calculator handles those cases where what you know is two dates and a full-period price.
Questions people ask
Neither method is written into statute for ordinary tenancies — the contract decides. Most tenancy agreements and deposit schemes favour the calendar-month method because rent is a monthly figure, but many agents use the annual method. If your agreement just says “pro rata”, ask which method produced the number and keep the reply.
Because a month is not a tidy fraction of a year. Dividing monthly rent by the days in that specific month prices February days higher than January days; spreading the year evenly prices every day the same. Over a few days the gap is small — on £975 rent and twelve days it is a few pounds — but on long part-months it grows.
Count the days you are responsible for the property, including both the first and the last day of the period you are paying for. Moving in on the 10th of a 31-day month usually means paying for the 10th to the 31st inclusive: 22 days — unless your first full monthly payment already covers part of that span, which is the double-charging trap to check.
Only if the contract clearly says so, which is uncommon in assured shorthold tenancies. Standard practice is a pro rata charge for the exact days. If you are asked for a full month plus a full month on the anniversary date, query it in writing before paying — overlapping periods are the most common letting-agent error.
The deposit itself is a fixed sum, not a time-based charge, so it is not pro-rated. But deductions from it for rent arrears should be calculated pro rata for any partial period, and the deposit scheme adjudicators expect to see the daily rate and the day count behind any such deduction.
Rates used: UK tax year 2026/27 · Last reviewed: October 2026. Calculations run in your browser — nothing you type is sent anywhere or stored by us.