How we collect data

The all-in formula

All-in monthly = (12 × monthly dues + joining fee + admin fee + annual fee) ÷ 12
This is the figure that makes gyms comparable. A £24.99/mo gym with a £15 joining fee costs more in year one than a £25.99/mo gym with no joining fee, and the all-in number is what surfaces that.

How the at-a-glance profile is worked out

We use the five axes below to create our rating.

• Value — how the all-in monthly price compares with other priced London gyms; lower costs score higher.
• Facilities — percentile by how many facilities the operator lists.
• Transport — how easy the gym is to reach on foot from nearby stations.
• Flexibility — whether you can join without a long contract, avoid upfront fees, or buy a day pass.
• Range — the breadth of training types and membership plans on offer.

Rules we hold ourselves to

• Prices come from the operator's own site, never a directory or aggregator.
• Each gym page links to the exact source URL, so any number can be checked.
• Locations are placed in a borough using ONS postcode data, not guesswork — anything outside Greater London is dropped, even when the brand calls it "London".
• A gym with no published price is shown as unpriced rather than filled in.
• Time-limited intro offers are displayed but excluded from the all-in figure.