Shower water calculator
Estimate household shower consumption and compare shorter showers or a lower flow rate.
Your inputs
This example illustrates household use. Enter your measured flow, shower habits and comparison. Results update as you edit.
Calculations run in your browser. Inputs are not saved or sent to analytics.
How it works
- Household water for the period = Effective flow rate × × × ×
- Effective flow rate = × 60 ÷
- Water saved in the period = Household water for the period − × × × ×
Input and formula key
Your result
Complete the inputs to see your result.
Assumptions and limitations
Assumes the same flow and duration for each shower. Showers per person per day may be fractional. The comparison changes only duration and flow; negative savings mean increased use. Measure flow by collecting a known volume and timing the fill. Heating, water prices and wastewater charges are excluded.
Sources
- EPA WaterSense — showerheads Sources reviewed: 2026-10-24
