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Compare calendar and annual/365 methods for part of a rent period, with the dates and daily rate shown.
Apportioned rent
£387.10Calendar methodDaily rate
£38.7110 days from 1 March 2027 to 10 March 2027, including both dates, give £387.10 using your selected method.
| Method | Daily rate | Apportioned rent |
|---|---|---|
| Calendar month | £38.71 | £387.10 |
| Annual / 365 | £39.45 | £394.52 |
Example figures.
Assumed period: 1 March 2027 to 31 March 2027. Calendar uses the actual period length; annual/365 uses a fixed 365-day divisor. Rates as of
Apportionment puts a value on part of a rental period. A move-in or move-out date may leave only some days to count, but the monthly payment alone does not tell you which calculation method applies. This calculator shows two approaches using the same dates.
Enter the amount for one complete weekly, monthly, quarterly or yearly period. Choose whether the date is a start or an end. A start date counts from that date through the end of its calendar period; an end date counts from the beginning of the period through that date. Both the first and last date are included, so a single-day interval counts as one day.
The assumed boundaries are Monday to Sunday for weekly rent, the first and last dates of the month for monthly rent, calendar quarters beginning in January, April, July and October, and January to December for yearly rent. A tenancy whose period begins on a different day needs its own calculation; this tool has no rent-due-day input.
Take £1,200 monthly rent and an end date of 10 March 2027. The assumed period runs from 1 to 31 March. Counting 1 March through 10 March inclusively gives ten days.
The difference comes from the daily-rate convention, not from a different number of occupied days.
The comparison is arithmetic only; it does not decide the rent legally owed. Only the calendar period containing the selected date is included. The form cannot calculate an interval spanning several periods, a mid-month rent cycle, a change in rent part way through the period or separate charges for bills. It does not subtract payments already made, so keep those amounts separate when reconciling an actual rent account.
Calendar month lengths follow the Gregorian calendar, including 29 February in a leap year. The annual method deliberately keeps the documented divisor of 365 even in a leap year. For £1,200 monthly rent covering all 29 days of February 2028, the calendar method gives £1,200 while annual/365 gives £1,144.11.
A fixed 365-day daily rate can produce more than one period’s rent in a longer period. For example, a full 31-day month may exceed one twelfth of annual rent, and counting 366 days of yearly rent gives 366/365 of the yearly amount. The calculator shows this arithmetic instead of capping it. Check whether that convention is appropriate before using the result.
No tax rate, market rent or government percentage enters this calculation. The official links below provide tenancy context only. GOV.UK’s guidance for assured periodic tenancies in England says rent is paid on the day stated in the agreement. Its overview describes weekly or monthly tenancy periods. Quarterly and yearly entries here are mathematical rent amounts, not confirmation that those tenancy periods are permitted.
Payment, refund and notice rules depend on the tenancy and the UK nation. Choosing a date does not end a tenancy, validate notice or determine whether a refund is due. Agree the dates and method before treating either figure as a payment demand.
Seek advice if the parties disagree about the tenancy end date, the agreement specifies a different calculation, rent was paid in advance and a refund is disputed, a deposit deduction is proposed, or the letting is a commercial lease. Take the agreement, rent account and notices with you; those facts determine the legal position.
It divides rent for a complete period into the amount attributed to part of that period. This calculator compares two mathematical methods using inclusive dates and calendar boundaries. The result does not establish a right to a refund or decide when a tenancy legally ends.
Find the daily rate for the chosen method, then multiply it by the days counted. For example, £1,200 monthly rent for 1 to 10 March 2027 is £1,200 ÷ 31 × 10 = £387.10 using calendar days. Keep the daily rate unrounded until calculating the total.
The calendar method divides monthly rent by the actual month length. The annual/365 method multiplies monthly rent by 12, then divides by 365. They can give different amounts. This tool retains 365 in leap years and shows both methods; check the agreement and applicable law before choosing which applies.
For a 52-week comparison, multiply monthly rent by 12 and divide by 52. A daily-rate conversion instead multiplies monthly rent by 12, divides by 365 and multiplies by 7, so it is a different convention. Neither is automatically your contractual rent. The weekly option here starts with a weekly amount and divides it by 7 under both methods.
Compare three methods for part of a month, with daily rates and days charged.
Convert rent periods and work out a part-month amount.
See what remains after running costs, mortgage payments and income tax.
Find the notice period for a possession ground and a conditional earliest court claim date.
