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Monthly Water Bill Estimator

Monthly water cost from gallons used and unit rate.

Estimate your monthly residential water bill from the number of gallons used per day, the per-thousand-gallons unit rate, and a fixed monthly service base charge.

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

gal/day
$
$

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Monthly bill = base + (gallons_per_day · 30) / 1000 · rate_per_1000.

In depth

Estimate your monthly residential water bill from the number of gallons used per day, the per-thousand-gallons unit rate, and a fixed monthly service base charge.