Broadband Comparison Guide
The headline monthly price is rarely what you actually pay. Our true-cost calculator adds the setup fee and any mid-contract price rise so you can compare broadband deals on the real total across the whole contract.
Broadband true-cost calculator
See the real total and effective monthly cost over your contract.
Price-rise rules from Ofcom. Always read the deal's terms.
Why the headline price is misleading
Broadband is sold on a single shiny number — "£25.99 a month" — but that figure almost never reflects what leaves your bank account over the life of the contract. Three hidden factors push the real cost higher: a one-off setup or activation fee, a mid-contract price rise that kicks in each year, and the simple fact that the contract length multiplies whatever you pay. Two deals with identical monthly prices can differ by £100 or more once you account for these, which is why comparing on the true total is the only fair test.
True cost = (monthly price × months) + setup fee + price-rise effect. Divide by the number of months and you get the effective monthly cost — the number to compare deals on.
Mid-contract price rises explained
For years, UK providers raised prices every spring by inflation (CPI) plus a fixed percentage — often inflation plus 3.9%. Because nobody can predict inflation, customers signed deals not knowing what they would actually pay. Since 17 January 2025, Ofcom requires providers to state any mid-contract price rise in pounds and pence at the point of sale, so the increase is fixed and predictable rather than tied to an unknown inflation figure. Older contracts may still carry percentage-based rises, so it pays to check which type yours uses.
The setup fee trap
Some headline-cheap deals charge a setup or activation fee of £20–£35. A deal at £24 a month with a £30 setup fee can be more expensive over 18 months than a £25 deal with free setup. Always fold the setup fee into the total. Our calculator does this automatically — enter the fee and it is added to the contract total and spread across the effective monthly figure.
How to compare deals fairly
Use the same yardstick for every offer: the effective monthly cost. Put each deal's monthly price, term, setup fee and stated price rise into the calculator and read off the effective monthly figure. The lowest one is genuinely the cheapest, regardless of how the headline price is dressed up. Remember to factor in router quality, speed, and any introductory-period structure — but on pure cost, the effective monthly number is your single source of truth.
When you can leave penalty-free
If a provider raises your price in a way that was not clearly disclosed in pounds and pence when you signed, you usually have a 30-day window to leave without an early-exit fee. Fixed rises that were spelled out upfront do not give that right. Ofcom's rules are designed to make this clearer, but the detail is in your contract, so read the price-change clause before you assume you are locked in. Compare current deals and switching rights on Ofcom.
Frequently asked questions
How do I work out the true cost of a broadband deal?
Add the one-off setup fee to the monthly price multiplied by the contract length, then add any mid-contract price rises. Dividing that total by the months gives the effective monthly cost.
Can broadband companies raise prices mid-contract?
From 2025, Ofcom requires providers to state any mid-contract price rise in pounds and pence upfront when you sign. Many older contracts still use percentage rises linked to inflation.
What is the average broadband price in the UK?
Average standard fibre broadband costs roughly £28 to £32 a month, though introductory deals can start lower before rising at the end of the term.
Do I have to pay a setup or activation fee?
Some deals charge a one-off setup or activation fee of £0 to £35. Always include it in the total cost, because a low monthly price with a high setup fee may not be the cheapest overall.
Can I leave if my broadband price goes up?
Only price rises that were not clearly set out when you signed give you a penalty-free right to leave. Fixed pounds-and-pence rises disclosed upfront do not, so check the contract terms.