Shower Water Usage by Flow Rate (Chart)
Updated 2025-09-04
Use this chart to estimate gallons per shower. For precise monthly and yearly costs, open the Shower Flow Calculator.
| Flow (GPM) | 5 min | 8 min | 10 min | 12 min |
|---|---|---|---|---|
| 1.5 | 7.5 gal | 12.0 gal | 15.0 gal | 18.0 gal |
| 1.8 | 9.0 gal | 14.4 gal | 18.0 gal | 21.6 gal |
| 2 | 10.0 gal | 16.0 gal | 20.0 gal | 24.0 gal |
| 2.5 | 12.5 gal | 20.0 gal | 25.0 gal | 30.0 gal |
Tips to Reduce Usage
- Install a low-flow showerhead (≤ 1.8 GPM).
- Shorten showers by 2–3 minutes.
- Fix drips and leaks promptly.