PW to PCM formula
Weekly to Monthly Rent Formula UK
The UK weekly-to-monthly rent formula annualizes PW rent first, then divides by 12 calendar months.
PCM rent
Weekly rent is annualized over 365 days, then divided by 12 calendar months.
| Input | Result |
| £150.00 | £651.79 |
| £190.00 | £825.60 |
| £200.00 | £869.05 |
| £250.00 | £1,086.31 |
| £300.00 | £1,303.57 |
| £350.00 | £1,520.83 |
| £400.00 | £1,738.10 |
| £450.00 | £1,955.36 |
| £500.00 | £2,172.62 |
Direct answer
The formula avoids weekly x 4 because 4 weeks is only 28 days.
How this calculator works
PCM = weekly rent x 365 / 7 / 12. The formula avoids weekly x 4 because 4 weeks is only 28 days. The result keeps the period math consistent, so a weekly, 14-day, 28-day, monthly, or annual amount can be compared on the same basis.
When to use this page
Use this when you want to check the PW-to-PCM formula behind a UK listing, not just copy a converted number. It is most useful when a listing quotes weekly rent and your rent cap or salary planning is monthly.
What this result does not include
The result converts rent only. Utilities, deposits, parking, pet rent, service charges, insurance, move-in fees, proration, and lease-specific payment rules are not included unless you add them to the rent amount yourself.
How to read the comparison
Use the converted amount for the budget period you actually plan with, then keep the original listing period visible so you do not lose track of how rent is collected. A calendar-month result is best for monthly bills, while a weekly, fortnightly, or 4-week result is better for matching a payment cycle.
Calendar month vs payment cycle
A calendar month is not always the same as a repeated payment cycle. Weekly, fortnightly, biweekly, and 4-week rent should be annualized before comparing with monthly rent.
Costs that can change the decision
If two listings are close, utilities, deposits, parking, pet rent, service charges, internet, and move-in costs can matter more than the converted rent difference.
Worked examples
Formula check
GBP 190/week is annualized first, then divided by 12. That avoids treating a calendar month as exactly 4 weeks.
Explaining the result
Use the formula when you need to show why a PW listing and a PCM listing should be compared through annual rent.