Pro rata rent calculator
Pro rata rent for a part month is calculated either on the annual method, the monthly rent multiplied by 12, divided by 365, multiplied by the days occupied, or on the calendar method, the monthly rent divided by the days in that calendar month, multiplied by the days occupied.
| Monthly rent | Annual method daily rate | Calendar method daily rate in a 30 day month | Calendar method daily rate in a 31 day month |
|---|---|---|---|
| £500.00 | £16.43 | £16.66 | £16.12 |
| £750.00 | £24.65 | £25.00 | £24.19 |
| £1,000.00 | £32.87 | £33.33 | £32.25 |
| £1,250.00 | £41.09 | £41.66 | £40.32 |
| £1,500.00 | £49.31 | £50.00 | £48.38 |
| £1,750.00 | £57.53 | £58.33 | £56.45 |
| £2,000.00 | £65.75 | £66.66 | £64.51 |
| £2,250.00 | £73.97 | £75.00 | £72.58 |
| £2,500.00 | £82.19 | £83.33 | £80.64 |
LLCR
LLCR is a private compliance register for landlords and letting agents in England. It keeps every certificate, deadline, notice and proof of service for each property in one tamper-evident record, so the evidence exists in order when a tenant, a council or a court asks for it. It is not a government service and is separate from the Private Rented Sector Database and any other statutory register.
Rent due and rent received for every tenancy, in one ledger.
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How this is calculated
Days occupied counts both the start date and the end date, so a period starting and ending on the same day is a single day.
The annual method multiplies the monthly rent by 12 to reach the annual rent, multiplies by the days occupied, and divides by 365. The 365 day year is a letting convention rather than a statutory figure: it keeps the daily rate the same in every month and every year, leap years included.
The calendar method charges each day at the rate of the month it falls in, the monthly rent divided by the days in that month. A period spanning the end of a month is split at the boundary and each part is charged at its own month's rate.
Money is calculated in whole pence and rounded down to the penny, once per figure on the annual method and once per month segment on the calendar method. Both figures are always shown; the method chosen sets which is highlighted.
Worked example
Take a monthly rent of £1,200 and a period from 20 April 2026 to 10 May 2026 inclusive.
- Days occupied is 21: the 11 days from 20 to 30 April, and the 10 days from 1 to 10 May.
- The annual method takes £1,200 multiplied by 12, which is £14,400 a year, multiplied by 21 days, divided by 365. That gives £828.49.
- The calendar method splits the period. April: £1,200 divided by 30 days is £40.00 a day, and 11 days gives £440.00. May: £1,200 divided by 31 days is £38.709 and so on a day, and 10 days gives £387.09.
- Adding the parts, the calendar method gives £827.09.
Based on the figures entered, the annual method gives £828.49 and the calendar method £827.09 for the same period. The gap comes from May: its 31 days make each May day slightly cheaper than the flat annual rate.
Frequently asked questions
Which method applies to a given tenancy?
Whichever the tenancy agreement states. Where the agreement fixes a daily rate or names a method, that wording governs, and section 7 of the Apportionment Act 1870 puts an express stipulation ahead of the Act's own default. Section 2 of that Act is the backdrop where an agreement is silent: rent is treated as accruing from day to day and as apportionable in respect of time. What section 2 does not do is fix a divisor. It makes rent apportionable without settling whether a day is worth a 365th of the annual rent or a share of the particular calendar month, so both conventions sit within it, and both are seen in practice. The Act has also been considered mainly on apportioning rent where a right to rent ends, rather than on pricing an opening part month. The tool shows both figures so the difference is visible before one is agreed.
Why do the two methods give different figures?
Because they price a day differently. The annual method spreads the annual rent evenly over 365 days, so every day of the year costs the same. The calendar method divides the monthly rent by the length of the particular month, so a day in February costs more than a day in August. The rates differ in every month, because no calendar month has exactly 365 divided by 12 days in it.
How is a period spanning two calendar months handled?
On the annual method nothing changes: every day carries the same rate, so the month boundary is invisible. On the calendar method the period is split at the boundary, each part is charged at its own month's rate, and the parts are added. Dividing the whole period by either month's length would give a different figure, which is why the tool splits rather than averaging.
How are leap years treated on the annual method?
The divisor stays 365. Keeping the convention fixed means the daily rate for a given rent is identical in a leap year and a common year, which is the point of the method. The calendar method reflects the leap year instead: February has 29 days, so each February day is slightly cheaper than in a common year.
Last reviewed 21 August 2026.
This tool performs general calculations for information only. It is not financial or tax advice.
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