shower water usage

Estimate water used generally from flow rate and run time.

About shower water usage

Water used = flow rate × run time. Typical showerheads run ~2 gal/min and low-flow models ~1.5; garden hoses run far more.

Formula

Gallons

gallons = flow (gal/min) × minutes

Worked example

With the default values below, shower water usage returns Water Used of 20.0. Change any input above and every figure here is recalculated in your browser.

Inputs used

Flow rateaccepts 0.1–20 gal/min: 2 gal/min
Run timeaccepts 1–600 min: 10 min

Results

Water Used: 20.0
Water Used: 75.7
Run Time: 10

Step by step

1Values used
2Gallons
3Water Used= 20.0
4Water Used= 75.7
5Run Time= 10

Assumptions and limits

The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
Flow estimate only.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Flow estimate only.

Frequently Asked Questions

Is this metered?

It is a flow estimate — meters also include leakage and other draws.

How accurate is this estimate?

Rates are approximate reference values. Local rates, exemptions and rules can differ, so treat the output as a planning figure only.