How much water does it take to produce 1 kg of beef?

Global average: ≈15,400 litres/kg beef (Mekonnen & Hoekstra, 2012). Breakdown: green water ≈92%, blue ≈4%, grey ≈4%. This is 30× more than equivalent plant protein.

What is grey water footprint?

Grey water footprint = volume of water needed to dilute pollutant load to ambient water quality standards. Formula: GWF = L / (Cmax − Cnat) where L = pollutant load, Cmax = maximum allowable concentration, Cnat = natural background concentration.

Water Footprint Calculator — Green, Blue, Grey Water

Calculate product water footprint using Hoekstra's water footprint framework. Separates green (rainwater), blue (surface/groundwater), and grey (polluted) water.

Tap constants to insert

Physical Constants Reference

Constant	Symbol	Value	Units
Speed of light	c	2.99792458×10⁸	m/s
Planck's constant	h	6.62607015×10⁻³‴	J·s
Boltzmann constant	kʙ	1.380649×10⁻²³	J/K
Avogadro's number	Nₐ	6.02214076×10²³	mol⁻¹
Gravitational constant	G	6.6743×10⁻¹¹	N·m²/kg²
Gas constant	R	8.31446	J/(mol·K)
Elementary charge	e	1.602176634×10⁻¹⁹	C
Electron mass	mₑ	9.1093837015×10⁻³¹	kg
Proton mass	mₚ	1.67262192369×10⁻²⁷	kg
Fine-structure constant	α	7.2973525693×10⁻³	dimensionless

How to use this calculator

1
Enter the physical or chemical quantities
Enter the physical or chemical quantities with correct units into the Water Footprint Calculator — Green, Blue, Grey Water input fields.
2
Verify conditions
Verify or adjust the conditions such as temperature, pressure, concentration, or environmental parameters.
3
Apply the scientific formula
Press Calculate to apply the scientific formula or physical law.
4
Compare with reference values
Review the result and compare it with standard reference values, CODATA constants, or published experimental data.

Formula

Result = f(physical quantities, constants, conditions)

physical quantities: Measured values with units entered into the Water Footprint.
constants: Physical or chemical constants (e.g. CODATA values, gas constant, Avogadro's number).
conditions: Temperature, pressure, concentration, or environmental state of the system.
Result: Computed physical or chemical quantity with associated units.

Compare results with standard reference values or published experimental data.

Glossary and Definitions

Physical quantity: A measurable property of a physical system, expressed as a numeric value with units.
Constant: A fixed, well-defined value (e.g. a CODATA constant) used across scientific calculations.
Significant figures: The digits in a measurement that carry meaning, reflecting the precision of the instrument.
Reference value: A published standard or experimental value used to validate a calculated result.
Water footprint calculator: A key concept referenced by the Water Footprint: Calculate product water footprint using Hoekstra's water footprint framework. Separates green (rainwater), blue (surface/groundwater), and grey (polluted) water.
Virtual water: A key concept referenced by the Water Footprint: Calculate product water footprint using Hoekstra's water footprint framework. Separates green (rainwater), blue (surface/groundwater), and grey (polluted) water.
Blue green grey water: A key concept referenced by the Water Footprint: Calculate product water footprint using Hoekstra's water footprint framework. Separates green (rainwater), blue (surface/groundwater), and grey (polluted) water.
Hoekstra water footprint: A key concept referenced by the Water Footprint: Calculate product water footprint using Hoekstra's water footprint framework. Separates green (rainwater), blue (surface/groundwater), and grey (polluted) water.

Related Calculators

Carbon Footprint

Environmental Science

Ecological Footprint