Faucet Flow Savings Calculator

See how much water and money a low-flow faucet saves over a year.

$
ANNUAL SAVINGS
—
per year

Usage Tip

Check the GPM rating stamped near the aerator, and add up every sink for whole-home savings.

THE MATH
$ = (old − new) × min × 365 × rate ÷ 1000
Where: old/new = flow rates (GPM)  •  min = minutes per day
• Savings shown per year
• Hot-water savings cut energy bills too
Scroll to Top

The calculators and tools on Formula Factory are provided for general guidance and informational purposes only. Results are estimates based on standard formulas and the values you enter — they do not constitute professional engineering, electrical, or architectural advice. Always verify calculations with a qualified professional before making decisions for any safety-critical, code-compliance, or commercial application. Formula Factory makes no representations or warranties as to the accuracy or completeness of any result, and accepts no liability for errors, omissions, or any outcomes arising from reliance on this information.