Water leak cost calculator
Estimate how much water a dripping tap or running leak wastes per day, month and year, and what it costs at your water and wastewater prices.
Up to 10,000 drips a minute at 0.01 to 10 mL per drip, or up to 1,000 L collected in 1 second to 7 days; 1 to 3,650 days; prices from 0 to 100,000 per selected volume. Calculated on your device; download a JSON report and a CSV of results. This calculator uses the measurement fields only. Results update as you type. Up to 1,000,000 characters.
Your result
How to use Water leak cost calculator
- Count drips per minute, or time how long the leak takes to fill a container.
- Enter the days until the leak is fixed.
- Enter your water and wastewater prices and the volume they are charged per.
- Review the water lost and the cost, then download the report or CSV.
Useful next steps
Measure the leak
Count drips for one minute, or catch the leak in a measuring jug and time it. A timed container gives a more reliable rate because drip size varies. The USGS Water Science School uses 0.25 mL for a kitchen faucet drip (checked 16 October 2026), so 60 drips a minute is 15 mL a minute, or 21.6 litres a day.
From rate to cost
The daily volume is scaled to a 365-day year and a month of one twelfth of a year. Cost multiplies the volume by your water and wastewater prices, divided by the volume they apply to, such as per cubic metre or per 1,000 US gallons. Money is rounded to 2 decimals.
Limits
The leak rate is assumed constant. Fixed charges, tiered prices and taxes are not included. Unit conversions use NIST SP 811 factors.