Shower Water Calculator
Calculate water and energy used for showers based on duration, flow rate, and water heating costs.
minutes
gal/min
USD/gallon
Water per Shower
20.0 gallons
Annual Shower Water7,280 gallons
Annual Heating Cost146 USD
Savings with 1.5 GPM Head58 USD
Water per Shower vs Showerhead Flow Rate
How to Calculate Shower Water Usage
Showers account for about 20% of indoor water use and are a major hot water expense.
Formula
Water per Shower = Duration (min) * Flow Rate (GPM)
Annual Water = Per Shower * Showers/Week * 52
Flow Rates
Example Calculation
An 8-minute shower with 2.5 GPM showerhead, 7 showers/week, $0.02/gal heating cost.
- 01Water per shower: 8 * 2.5 = 20 gallons
- 02Weekly: 20 * 7 = 140 gallons
- 03Annual: 140 * 52 = 7,280 gallons
- 04Heating cost: 7,280 * $0.02 = $146/year