How do I read my water meter?

Note the m³ figures shown on the meter on two dates, then enter them in the “Measure with my water meter” tab along with the number of days between them.

Why does the estimate differ from my bill?

The estimate relies on average values per use and excludes garden, car, pool and leaks. Your bill measures all actual uses.

Which actions save the most water?

It depends on your habits: the “Possible actions” section of the calculator ranks actions by the estimated saving for your household.

Are my answers stored?

No. Calculations run in your browser and no input is kept.

Calculate your household water consumption

This calculator estimates, in litres per person per day, the water used at home for showers, baths, toilets, laundry and dishes.

It helps you understand your bill, prepare for water restrictions during droughts and identify the actions that save the most.

You can also measure your actual consumption with two meter readings or the volume shown on your bill. Nothing is stored.

Estimate your consumption

Starting assumptions, to adjust

Number of people

Showers per person per week

Length of a shower (minutes)

Baths per week for the household

Toilet flushes per person per day (average assumption)

Laundry loads per week for the household

Toilet flush type

StandardDual flush

Household dishwashing

DishwasherBy hand (estimate)

Dishwasher cycles per week

Your estimate per person per day

126.4 to 138.4 L

Central value: 132.4 L per person per day.

Compared with the French national average: 145 L/person/day (SISPEA 2025, French Biodiversity Agency (OFB), 2023 data)

Below this average.

Possible actions

Shorten each shower by 2 minutes48 L/day for the household, i.e. 24 L per person.
Switch from a standard to a dual flush32 to 56 L/day for the household, i.e. 16 to 28 L per person.
Run one fewer laundry load a week5.7 to 11.4 L/day for the household, i.e. 2.9 to 5.7 L per person.

Indicative savings calculated separately; several selected actions are recalculated together. Dual flush and laundry: ranges. Shower replacing a bath: length entered.

With all suggested actions

71.5 to 92.7 L per person per day

Indicative estimate based on average values (ARS; orders of magnitude vary between sources, ADEME and CIEAU sometimes give higher values for showers). Your actual consumption is shown on your meter. Does not cover garden, car, pool or leaks. Official instructions take precedence.

National reference average for France: 145 L per person per day (53 m³ per year), according to the SISPEA 2025 report by the French Biodiversity Agency (OFB) (2023 data, press release of 7 July 2025). OFB

Calculate your household water consumption

Estimate your consumption

Your estimate per person per day

With all suggested actions

Frequently asked questions

Go further

Treating tap water

Water quality in my town

How much water should I drink?