Drip Faucet Calculator
See how much water a dripping tap wastes and what it costs you over a year.
Last updated · View algorithm, constants and default inputs (JSON)
About this calculator
Drop volume varies. The default 0.25 mL is a reference example: at one drop per second it is about 2,080 US gallons per year. Enter an observed drop size for a better estimate. The annual charge uses the water rate entered and excludes sewer charges and fixed fees.
Worked example
calculated with the default values below
Drips per minute 60 drips/min · Drop size 0.25 mL · Water rate 4.5 $/1000 gal Water wasted per day 5.71 gal · Water wasted per year 2,083 gal · Water wasted per day 21.60 L · Estimated water charge per year 9.37 $
General background references
Disclaimer
These calculators provide planning estimates only. Building codes, wiring regulations and safety requirements differ by country and change over time, and nothing here replaces a licensed professional or a permit. For structural, electrical or gas work, follow local code and have the installation inspected.
Implementation source
This record describes the implementation used by this page. It is not independent validation. External references, when available, support only the stated formula or definition; estimates and custom rules retain their own assumptions.
Formula and variables
G = d × 1440 × v ÷ 3785.41; C = G × 365 ÷ 1000 × r
- d
- drips per minute
- v
- drop volume, mL
- G
- water per day, gallons
- r
- rate per 1000 gallons
- C
- yearly cost
1 US gallon = 3,785.41 mL; liters/day = gallons/day × 3.78541. Annual charge uses only the entered water rate.
Frequently asked questions
What should I know about this estimate?
Drop volume varies. The default 0.25 mL is a reference example: at one drop per second it is about 2,080 US gallons per year. Enter an observed drop size for a better estimate. The annual charge uses the water rate entered and excludes sewer charges and fixed fees.