Glossary / PCM
What does PCM mean?
PCM stands for per calendar month - the rent you pay for each calendar month, not for four weeks.
So a room advertised at £650 PCM is £650 a month, and that's the PCM meaning in rent in one line. What catches people out is comparing it against a weekly price, and whether the number covers a room or a whole flat.
What does PCM stand for?
PCM is short for per calendar month. In UK rent listings it sits right after the figure: £800 PCM, £1,100 PCM, £650 PCM.
It means the rent for one calendar month, however long that month happens to be. February is 28 days, July is 31, and you pay the same in both.
Why it matters to you: a month is longer than four weeks. There are 52 weeks in a year, not 48, so a rent quoted PCM is always a bit more than the same rent multiplied by four. That gap is where first-time budgets quietly slip.
Some adverts quote PW instead. Our guide to what PW means in rent listings covers that side of it.
PCM vs PW: why you multiply by 4.33, not 4
To compare PCM vs PW, get both onto the same basis first. The formula is weekly rent × 52 ÷ 12, which is roughly × 4.33.
The common mistake: using × 4. On £150 PW that gives £600. The real monthly figure is £650 - £50 short every month, or £600 across a year.
The trade-off: weekly pricing is common on shorter, more flexible lets, so it isn't a red flag on its own. It does make a room look cheaper next to a monthly listing, which matters when you're scrolling twenty ads in a row.
What to check: whether the advert says PCM or PW at all. Plenty leave it out and assume you know.
If you'd rather skip the arithmetic, our PCM/PW rent calculator converts both directions instantly and shows the working.
Is PCM per person or per property?
It depends what's being advertised, which is exactly why you ask.
A whole-flat advert at £2,400 PCM means the flat, not each tenant - split three ways that's £800 each before bills. A room advert at £950 PCM usually means that one room for one person, so it's already per person.
What to check: whether the figure covers the whole property or your room, and whether it's per person on top. Get the answer in writing before any money moves.
Why it matters to you: mixing the two up is how a budget ends up £400 a month out.
Worked examples: 150 PW to PCM, £600 PCM and £650 PCM
Three figures that come up again and again.
150 PW to PCM: £150 × 52 ÷ 12 = £650 PCM. Not £600.
£600 PCM: reversed, £600 × 12 ÷ 52 = about £138 PW. Handy when the other room you like is priced weekly.
£650 PCM means £150 PW seen from the other direction. £650 × 12 ÷ 52 = £150 PW.
The trade-off: none of these are all-in figures. A £650 PCM room with £120 of bills on top is really £770 PCM, so compare the full monthly cost, not the headline rent.
What to check before you sign
What to check: the payment frequency, not just the amount. Rent quoted PCM is normally paid monthly, but your tenancy agreement decides how often you actually pay - Shelter explains what rent is lawfully due.
What to check: what the rent includes. "Bills included" usually means council tax, water and energy, and rarely everything, so ask for the list in writing.
The trade-off: a holding deposit reserves the room while checks run. In England it's capped at one week's rent, so on £650 PCM that's £150 - the same conversion as above. Our holding deposit guide covers when you get it back, and GOV.UK's guidance for tenants sets out the rules.
What changed: since 1 May 2026, most tenancies in England are assured periodic - rolling, with no fixed end date. The monthly figure you agree is the one you pay each month until the tenancy ends properly, and our Renters' Rights Act entry covers what shifted.
Frequently asked questions
Is PCM per person?
Not on a whole-flat advert - that price is for the property and gets split between sharers. On a room advert it normally is per person, because you're renting one room as one tenant. Ask which, then confirm it in writing.
Does PCM include bills?
No, not by default. PCM describes the rent basis, not what's bundled into it. If bills are included the advert should say so, and it's worth asking exactly which ones.
What does PCM mean in a room advert?
The monthly rent for that room. "£900 PCM, double room in Clapham" means £900 for each calendar month, not £900 per four weeks. Only compare it to a PW listing once you've converted both.
Still torn between two rooms? Run both through the calculator before you book viewings. It takes ten seconds, and it stops you falling for the one that only looks cheaper.