Low-Flow Showerhead Savings Calculator

About this calculator

Water and energy savings from switching showerheads come down to the difference in flow rate: an older standard showerhead often runs at 2.5 gallons per minute (the US federal maximum since 1992) or higher on pre-1992 fixtures, while an EPA WaterSense-certified low-flow showerhead uses 2.0 gallons per minute or less without sacrificing pressure, thanks to aerating or pulsing nozzle designs. Multiplying the flow-rate difference by your average shower length and the number of showers taken per year gives total gallons saved annually.

Because a large share of that water was also heated, the savings extend beyond the water bill to the energy cost of heating less water — which is why utilities and water conservation programs often promote low-flow fixtures as one of the highest-return, lowest-effort upgrades a household can make. Enter your old and new flow rates (plus your shower habits) to see your estimated yearly water and cost savings.