Drip Faucet Calculator
See how many litres and how much money a dripping faucet wastes every day and year, with everyday equivalents.
🚰 What is a Drip Faucet Calculation?
A drip faucet calculation converts a small, easy-to-ignore leak into the litres and money it actually costs over a day and a year. Every drop from a worn washer or a loose cartridge is small on its own, often well under half a millilitre, but a faucet drips continuously, day and night, whether or not anyone is watching. Multiplying a tiny per-drop volume by 1,440 minutes a day and 365 days a year is exactly the kind of compounding effect that intuition consistently underestimates.
Homeowners use this calculation to decide whether a dripping tap is worth fixing immediately or can wait, landlords use it to estimate the cost of ignoring maintenance requests across a building, and educators use it as a simple, visceral example of how small continuous waste adds up, a theme that also applies to energy leaks, unattended screens and idling engines.
The number that usually surprises people most is not the annual litres but the everyday equivalents. Thousands of litres a year is hard to picture on its own, but expressing it as dozens of full bathtubs or over a hundred showers makes the scale immediately concrete, which is why this calculator reports both.
The result is not meant to be a precise engineering measurement, since drop size and drip rate both vary with water pressure, washer wear and even temperature. It is meant to turn a rough estimate, one drip a second and roughly a third of a millilitre a drop, into a defensible order-of-magnitude figure that makes the case for a five-minute washer replacement.
📐 Formula
📖 How to Use This Calculator
Steps
💡 Example Calculations
Example 1 — A Typical One-Drip-Per-Second Faucet
60 drips a minute, 0.3 mL per drop, $2.50 per cubic metre
Example 2 — A Slow, Easy-to-Miss Drip
15 drips a minute, 0.3 mL per drop, $2.50 per cubic metre
Example 3 — A Fast Leak With Big Drops
120 drips a minute, 0.5 mL per drop, $3.00 per cubic metre
❓ Frequently Asked Questions
🔗 Related Calculators
How much water does a dripping faucet waste in a year?
At one drip per second (60 drips a minute) and a typical 0.3 mL drop, a faucet wastes about 25.9 litres a day, which adds up to roughly 9,461 litres a year, equivalent to about 63 full bathtubs.
How much does a dripping faucet cost per year?
At 9,461 litres a year and a water price of $2.50 per cubic metre, the wasted water alone costs about $23.65 a year for one faucet. Multiply by every dripping fixture in a building and the total climbs quickly.
How big is a single drop of water from a faucet?
It varies with the washer and water pressure, but a commonly used estimate is about 0.3 millilitres per drop, in line with widely cited utility figures for a faucet dripping at roughly one drop per second wasting several thousand gallons a year.
Is one drip per second really that much water?
Yes. Sixty drips a minute at 0.3 mL each is 18 millilitres a minute, which sounds small until it is multiplied by 1,440 minutes in a day and 365 days in a year, turning into thousands of litres nobody used.
How is the annual cost calculated?
Annual litres are divided by 1,000 to convert to cubic metres, then multiplied by the local water price per cubic metre. Utilities typically bill in cubic metres or thousands of gallons, so this matches a real water bill line item.
What is a realistic drip rate to start from?
One drip per second, 60 drips a minute, is the classic reference rate used by most water utilities' educational materials because it is easy to time by ear or eye and represents a moderate, easily ignored leak.
Does a faster leak waste proportionally more water?
Yes, the relationship is directly proportional. Doubling the drip rate exactly doubles the daily litres, the annual litres and the annual cost, since none of the other variables change.
How many showers is a year of faucet drips equal to?
At the default drip rate, about 146 eight-minute showers' worth of water, using 65 litres as a typical shower volume. A faster leak at two drips a second pushes that past 290 showers a year.
Should I worry about a slow drip or only a fast leak?
Both matter over a year. Even a slow 15-drips-a-minute trickle wastes over 2,300 litres a year in this calculator's default settings, so any audible drip is worth fixing rather than dismissing as too small to matter.
Does fixing a hot water drip save more than a cold one?
Yes. A dripping hot tap wastes the water itself plus the energy already spent heating it, so the true cost of ignoring a hot-side drip is higher than the water-only figure this calculator reports.
How quickly does fixing a washer pay for itself?
Almost always within the first year. A replacement washer or cartridge typically costs a few dollars, while even a moderate drip wastes tens of dollars of water a year in the examples above, an easy payback.
Why does this calculator assume the drip never stops?
Because that is the realistic worst case for an unfixed leak; faucets drip continuously whether or not anyone is home or awake. Treating the drip as constant, 1,440 minutes a day, gives the honest annual total rather than an underestimate.