Rent pcm to pw Converter: Monthly, Weekly, 4-Weekly & Annual

Landlords and tenants meet the same rent quoted three different ways — per calendar month, per week, and per four weeks — and converting between them by hand is where small, real-money mistakes creep in. Enter one figure and this calculator gives you all four (monthly, weekly, four-weekly and annual) using the same method the law itself uses for the tenancy deposit cap, works out a deposit at any number of weeks’ rent, and gives the day-rate and pro-rata amount for a tenancy that starts partway through a month.

What do pw and pcm mean in UK rent?

pw means per week and pcm means per calendar month. London and student lets are often advertised per week; most other UK lets per calendar month. To turn pw into pcm multiply by 52 and divide by 12 (about ×4.33); to turn pcm into pw multiply by 12 and divide by 52.

Rent pw to pcm table (£100–£1,000 a week)

Rent pcm to pw table (£500–£3,000 a month)

Why is it ×12 ÷ 52, not ×4?

Under the Tenant Fees Act 2019, “one week’s rent” is defined in law as the annual rent divided by 52 — the same figure behind the deposit cap. For a tenancy paid monthly, the annual rent is the monthly rent × 12, so the weekly figure is monthly rent × 12 ÷ 52. A year runs to just over 52 weeks, not 48 (12 months × 4 weeks) — so multiplying a weekly rent by 4 to estimate the monthly figure undercounts it by roughly a twelfth. The exact ratio, 52 ÷ 12, comes to about 4.33; an agent who quotes “×4.33” is using the same ratio, just going the other way (weekly × 52 ÷ 12 = monthly). This tool always works through the exact fraction rather than the rounded 4.33, so the four figures line up exactly with each other and with the deposit-cap maths.

Pro-rata rent for a mid-month start

There is no statutory formula for a partial first month — it is whatever the tenancy agreement says. The convention most UK letting agents use is to divide the monthly rent by the actual number of days in that calendar month (28, 29, 30 or 31), then charge for the days the tenant actually occupies it. A tenancy starting on the 15th of a 30-day month, for example, owes rent for the 16 days from the 15th to the end of the month — not a fixed annual ÷ 365 figure, which gives a slightly different number in February and in 31-day months. Check the tenancy agreement’s own wording; this calculator uses the days-in-month method.

Deposit at any number of weeks

Enter how many weeks you need turned into a cash figure — it defaults to 5 weeks, the English cap where the annual rent is under £50,000. For the full legal cap by nation (including Scotland and Wales), holding deposits and the protect-by deadline, use the tenancy deposit calculator.

“One week’s rent” = annual rent ÷ 52: Tenant Fees Act 2019, Schedule 1, paragraph 2(4)(c), read on legislation.gov.uk 13 September 2026. Pro-rata (days-in-month) convention cross-checked against OpenRent’s landlord guidance, read the same day; tenancy agreements can specify a different method. Deposit-cap figures from taxdata.py, checked 2026-08-29. General information, not advice.