How much should my household use?

At the England average of 136.5 litres per person per day, about 49.8 cubic metres a year for one person and 199.3 for four. Those are reference points rather than targets, because the spread between two ordinary households of the same size is very wide.

My bill is 20 per cent above expected. Is that a leak?

Not on its own. Twenty per cent is inside the range that a garden, a longer shower habit, someone working from home or a slightly different household size explains. What it does justify is spending one night on a meter test, which measures loss directly instead of inferring it.

How do I turn a gap into a leak rate?

Divide the gap in cubic metres a year by 365 and multiply by 1,000 for litres a day, then divide by 24. A gap of 50 cubic metres a year is about 5.7 litres per hour running continuously.

Why does this not give me a rate of loss?

Because a bill covers a billing period rather than a measured interval, and nothing on it says when the water moved. Converting a quarterly total into litres per hour would assume the use was perfectly even, which no household is. The meter test gives a rate because it measures one.

Does this work outside England?

The arithmetic does. The reference figure does not: it is an England average, so a Welsh, Scottish or Northern Irish household is being compared against a number from somewhere else. Household use is broadly comparable across the UK, but the figure is not theirs, and this site would rather say so than quietly present it as a UK average.

Why is there no adjustment for the type of property?

Because no sourced basis for one was found, and rather than offer a control that did nothing, this site offers none. A flat, a terrace and a detached house differ in ways that plainly affect water use, but nobody has published a factor we could cite for it, and inventing four numbers so the form looked complete would be worse than leaving the question open.

Is my water bill too high

A household of four in England would be expected to use around 199 cubic metres a year at the published average. A bill within 10 per cent of that tells you nothing, because ordinary differences in habit are wider than that. A bill 50 per cent above it means an extra 100 cubic metres a year, which is a continuous loss of about 11 litres per hour if it is a leak at all.

Last reviewed 14 August 2026

What this calculator tells you

It compares the volume on your bill against what a household your size would be expected to use, and reports the gap as a volume, a cost and a classification.

The expected annual volume in cubic metres for your occupancy
The gap between that and your billed volume, as a volume and as a percentage
What that gap is worth in litres per day and in pounds a year
A classification, and what it justifies doing next

It reports no rate of loss in litres per hour, deliberately. A bill covers a billing period rather than a measured interval, so dividing it down to an hourly rate would be inventing precision the bill never contained.

How to take the measurement

You need one number off your bill and one about your household, and the first is not the number printed largest.

The volume billed, in cubic metres, over a stated period. Not the amount in pounds, which mixes the volumetric charge with a standing charge.
The period that volume covers, so an annual figure can be worked out. A quarterly bill needs multiplying by four, and a bill covering an odd number of days needs scaling.
How many people live in the property, counting anybody there most of the time rather than only those named on the bill.

Finding the volume is the part that trips people up, because a UK water bill devotes far more space to money than to cubic metres. how to find the volume on a UK water bill shows where it is.

Using the calculator

How many people live there

Number of people in the property must be a number.

Where the property is

The published per person figure does not cover every nation, and the result says so when it does not cover yours.

Water used in the last year, from your bill

Your bill gives this in cubic metres. It is the figure the whole comparison rests on, so take it from the bill rather than estimating.

Your annual consumption from the bill must be a number.

Garden watering

Averaged across the year. Leave at zero if you do not water.

Pool top up

Averaged across the year rather than a summer figure. A pool that is topped up regularly moves the expected total more than garden watering does, so it is worth setting even roughly.

Who supplies your water?

It is on your bill. The rate per cubic metre comes from this company's charges scheme.

Gap against expected

0.0 cubic metres per year

What your result means

The gap is expressed as a percentage of expected use, and the four bands describe what a gap of that size actually justifies rather than delivering a verdict.

Gap	As a volume	What it justifies
Below expected	under 199 m³ a year	Nothing. Consumption is below the expectation, so there is nothing here suggesting a leak.
Within 10 per cent	179 to 219 m³	Nothing. That range is well inside what ordinary differences in habit explain.
10 to 50 per cent above	219 to 299 m³	One night on a meter test. Habit can still explain it, and a measurement settles it.
More than 50 per cent above	over 299 m³	A meter test now. That is an extra 100 cubic metres a year, which is about 11 litres per hour continuously.

What a gap means, for a household of four

The reason the first two bands justify nothing is worth stating plainly. The spread between two ordinary households of the same size is far wider than ten per cent, so a result inside that range carries no information at all. Presenting it as reassurance would be as misleading as presenting it as a warning.

And a comparison is not a measurement. Whatever band you land in, measure the current rate of loss at the meter is what turns it into a number, because a bill is historic and a meter test is now.

No service is offered under this result, and that is deliberate rather than an oversight. A gap against an average is not evidence of a leak: the expectation it is measured against is an England figure that differs from your bill in three known ways, and four of the six usual causes of a high bill are free to rule out yourself. Putting a paid investigation under a number that weak would contradict a page one click from here. Every other calculator on this site measures something. This one compares, and a comparison does not justify the same next step.

How the calculation works

Expected use is one multiplication, and the comparison is a subtraction.

Expected litres a day = the per person figure × the number of people
Expected cubic metres a year = that × 365 then ÷ 1,000
The gap = your billed annual volume − the expected annual volume
The gap as a rate = the gap × 1,000 ÷ 365 ÷ 24 litres per hour, if it were continuous

That last conversion carries an explicit "if". A gap is a total over a year and says nothing about when the water moved, so expressing it as a continuous rate is a way of picturing the size rather than a claim about the pattern. A leak is continuous. A summer of watering is not, and both produce the same annual gap.

The calculation refuses to run at all without a per person figure supplied by the caller. There is no default and no remembered number anywhere in it, which means this page cannot publish on an unsourced figure even by accident.

The two adjustments it does offer, for garden watering and for a swimming pool, both default to zero, so nothing here can quietly inflate the expectation and turn ordinary use into a suspected leak. Neither has a sourced default, which is exactly why the default is nothing rather than a guess. There is no adjustment for property type at all, because no sourced factor for one was found and a control with no number behind it is worse than an absent one.

Assumptions and sources

Water resources 2024 to 2025: analysis of the water industry's annual water resources performance

Environment Agency · primary source

Household per capita consumption: 136.5 l/person/day
Household per capita consumption, prior year: 137 l/person/day
Household per capita consumption, dry-year adjusted: 140.3 l/person/day
National leakage: 2617 Ml/day
National leakage as share of water put into supply: 19 %

PR24 common performance commitments: per capita consumption (PCC), version 2.1

Ofwat · primary-standard source

PCC formula: (measured household consumption + unmeasured household consumption) / total household population l/person/day

Litres in a cubic metre

Exact by definition

SI definition. The litre is defined as one cubic decimetre, so one cubic metre is exactly 1,000 litres.

Hours in a day

Exact by definition

Definition of the day as 24 hours.

Days used for an annual figure

Editorial convention

Annual figures on this site are a daily rate multiplied by 365. Leap years are not modelled, so a leap year is understated by one day, which is 0.27 per cent.

Garden watering allowance

Illustrative assumption, editable above

Illustrative assumption, defaulting to zero. Garden use varies with the weather, the size of the garden and whether it is watered by hose or by can, and no cited average has been sourced. A default of zero means the expected figure is never quietly inflated. Put your own figure in if you water regularly.

The reference figure is 136.5 litres per person per day, from the Environment Agency's annual analysis of water industry performance, for England in 2024 to 2025. It is England only and this site says so wherever it appears.

Three things about that figure make it different in kind from the number on your bill, and all three push the same way, which makes your consumption look closer to average than it is.

It excludes water lost from supply pipes. Your meter counts it. On a leak calculator that is the mechanism rather than a caveat: the gap between the two is partly the leak.
It is adjusted upward for meter under-registration. Your bill is not.
It blends metered and unmetered households, and unmetered households typically use more. You are metered.

None of the three is corrected for. Three documented directional biases a reader can weigh are worth more than one invented correction factor nobody can check.

The full definition, and what each of those means in practice, is on expected household use per person per day.

What to do next

Four things, and the first two cost nothing and rule out most large gaps.

Subtract the obvious before treating a gap as a leak: a garden, a pool, more people at home than the bill assumes, a new appliance, or a summer of hot weather.
Compare a full year against a full year rather than quarter against quarter. A year contains one of every season and two quarters do not.
Run an overnight meter test with everything closed. A gap is historic and a rate is current, and only the second one can be acted on.
If the meter test is clean, the gap was use rather than loss. That is a real answer and it is worth knowing, because it stops you looking for something that is not there.

A large gap with a clean meter test almost always means real use nobody has accounted for, and the most common candidate is seasonal. expected household use per person per day covers what routinely gets missed.

Common questions

How much should my household use?: At the England average of 136.5 litres per person per day, about 49.8 cubic metres a year for one person and 199.3 for four. Those are reference points rather than targets, because the spread between two ordinary households of the same size is very wide.
My bill is 20 per cent above expected. Is that a leak?: Not on its own. Twenty per cent is inside the range that a garden, a longer shower habit, someone working from home or a slightly different household size explains. What it does justify is spending one night on a meter test, which measures loss directly instead of inferring it.
How do I turn a gap into a leak rate?: Divide the gap in cubic metres a year by 365 and multiply by 1,000 for litres a day, then divide by 24. A gap of 50 cubic metres a year is about 5.7 litres per hour running continuously.
Why does this not give me a rate of loss?: Because a bill covers a billing period rather than a measured interval, and nothing on it says when the water moved. Converting a quarterly total into litres per hour would assume the use was perfectly even, which no household is. The meter test gives a rate because it measures one.
Does this work outside England?: The arithmetic does. The reference figure does not: it is an England average, so a Welsh, Scottish or Northern Irish household is being compared against a number from somewhere else. Household use is broadly comparable across the UK, but the figure is not theirs, and this site would rather say so than quietly present it as a UK average.
Why is there no adjustment for the type of property?: Because no sourced basis for one was found, and rather than offer a control that did nothing, this site offers none. A flat, a terrace and a detached house differ in ways that plainly affect water use, but nobody has published a factor we could cite for it, and inventing four numbers so the form looked complete would be worse than leaving the question open.