Water Footprint Calculator
Your water footprint — the water you use directly and the far larger amount embedded in the food and goods you buy.
Direct use is what comes out of the tap: showers, laundry, dishes, garden.
How the water footprint calculator works
Direct use is what comes out of the tap: showers, laundry, dishes, garden. It is typically 150 to 250 litres a person a day.
Embedded water dwarfs it. Producing a kilogram of beef takes about 15,000 litres; a cotton t-shirt about 2,700; a cup of coffee about 130. Direct household use is usually under 5% of the total, which is why efficient showerheads matter far less than diet.
Formula: total = direct use + embedded water in consumption
Worked examples
| Inputs | Total annual water footprint | Note |
|---|---|---|
| A typical household member | 584,559 L | about 570,000 L a year |
| No beef | 184,159 L | more than halves the total |
| A shorter shower | 571,419 L | barely moves the total |
FAQFrequently asked questions
What is a water footprint?
All the water used to support your consumption — what comes out of your taps plus the far larger volume embedded in what you buy.
How much water is in a kilogram of beef?
About 15,400 litres, most of it rain falling on the feed crops. A cotton t-shirt is around 2,700; a cup of coffee 130.
Does taking shorter showers help?
A little. Direct household use is typically under 10% of the total footprint, so diet changes achieve far more than bathroom ones.
Is all water use equally bad?
No. Rainwater used where it falls is very different from irrigation drawn from a depleting aquifer. Footprint totals hide that distinction.
What is the biggest lever?
Reducing beef, and reducing food waste — throwing out food discards all the water that went into producing it.
Where these figures come from
- UK DESNZ / DEFRA — Greenhouse gas reporting: conversion factors — the flight, fuel and waste emission factors used here
- Scarborough et al. (2014), Climatic Change — Dietary greenhouse gas emissions — the per-diet daily emission figures
- US EPA — Technical Assistance Document for the Reporting of Daily Air Quality (AQI) — the PM2.5 breakpoints the air quality calculator uses
- UK Department for Energy Security and Net Zero — conversion factors — the official UK emission factors
Last checked: September 2026. Factors are taken from published government and peer-reviewed sources, each named on the page with its year.