Free environment & sustainability calculator

Water Savings Calculator

Estimate water saved when replacing a higher-flow fixture or reducing water use.

Enter your details

L/min
L/min
min/day
days

Calculation method

Water saved = (current flow − new flow) × minutes/day × days/year.

Your result

Annual water saved
—
Liters saved
—
Current use
—
New use
—
Percent saved
—
The calculation assumes the entered flow and usage duration remain constant throughout the year.

How to use this calculator

What to enter

Enter or select the following as requested: Current flow/use; New flow/use; Minutes per day; Days per year. Follow the units, valid ranges, examples, and options displayed beside each field.

What the result means

The environmental result estimates resource use, emissions, efficiency, or savings from the activity, energy mix, quantities, and factors entered. Check the unit basis, geographic emissions factors, system boundary, time period, and whether upstream production or disposal impacts are included.

When to use it

Use this to compare sustainability scenarios or identify potential savings. Treat the result as an estimate that depends on the assumptions and data source; use locally relevant factors for reporting or compliance.