Water meter calculator
Smaller households often pay less on a meter. Compare your current unmetered bill with an estimate of a metered one.
How this is calculated
Water used a year is people times litres a day times 365, divided by 1,000 to give cubic metres.
The metered bill is that volume times the price per cubic metre, plus the yearly standing charges.
The unmetered bill is whatever you pay now, usually based on the old rateable value of your home rather than how much you use.
Rates used · 2026/27
| 1 cubic metre | 1,000 litres |
| Metered bill | volume times price, plus standing charges |
| Unmetered bill | based on the property, not use |
| Charges | vary by water company |
Last checked July 2026. Source: HMRC and gov.uk.
Worked example
Two people using 140 litres each a day use about 102 cubic metres a year. At £4.50 a cubic metre plus £60 of standing charges a meter would cost about £520, against a £550 unmetered bill, so about £30 a year less.
Common questions
Will a water meter save me money?
Often, if fewer people live in your home than there are bedrooms. Larger households in smaller homes can pay more on a meter.
Can I switch back if it costs more?
Many water companies in England and Wales let you switch back to unmetered charges within a set period after a meter is fitted. Check your company's rules first.
Does a meter cost anything to fit?
In England and Wales a meter is normally fitted free if you ask for one.
How can I cut my metered bill?
Shorter showers, full loads in the washing machine and dishwasher, and fixing dripping taps make the biggest difference.