Drip Faucet Calculator
Our sustainable living calculator computes drip faucet accurately. Enter measurements for results with formulas and error analysis.
Reviewed by Daniel Agrici, Founder & Lead Developer
Formula
Annual = drips/min * mL/drip * 525600 / 3785.41
Drips per minute times drop volume gives flow rate, scaled to yearly minutes and converted from mL to gallons.
Worked Examples
Example 1: Moderate: 10 Drops/Min
Problem:0.05 mL/drip, $0.015 water + $0.012 sewer.
Solution:Volume: 0.5 mL/min = 720 mL/day = 0.19 gal/day\n69.4 gal/yr * $0.027 = $1.87/yr
Result:69 gal/yr | $1.87 cost | Repair payback: ~5 days
Example 2: Fast: 60/Min, 2 Faucets
Problem:1 drip/second, 2 leaky faucets.
Solution:Per faucet: 4,320 mL/day = 1.14 gal/day = 416 gal/yr\nTotal: 833 gal/yr * $0.027 = $22.49/yr
Result:833 gal/yr | $22.49 | 49 showers equivalent
Frequently Asked Questions
How much water does a dripping faucet waste?
A faucet dripping at 10 drips per minute wastes approximately 347 gallons per year. At one drip per second the waste jumps to about 2,082 gallons annually. Even a slow drip of one drop every six seconds adds 58 gallons per year. The USGS estimates US household leaks waste over 1 trillion gallons annually enough to supply 11 million homes. A single dripping faucet seems insignificant but multiplied across millions of households the impact is enormous.
How much does a dripping faucet cost?
A typical dripping faucet costs 3 to 30 dollars per year depending on local water and sewer rates. At an average combined rate of 0.027 dollars per gallon and moderate drip of 10 drops per minute, annual cost is about 9.37 dollars. A faster drip of one per second can cost 20-60 dollars annually. In expensive water areas costs can be significantly higher. Impact multiplies with multiple leaky faucets or hot water side drips adding heating costs.
What causes a faucet to drip?
The most common cause is a worn rubber washer or O-ring that no longer creates a watertight seal. In compression faucets the seat washer hardens and cracks with age. Ball faucets leak from worn springs and seats. Cartridge faucets drip when O-rings deteriorate. Ceramic disc faucets leak if sediment damages disc surfaces or inlet seals wear. High water pressure exceeding 80 PSI accelerates wear on all components and can cause intermittent dripping.
Is it worth fixing a slow drip?
Yes, fixing even a slow drip is almost always cost-effective. A basic washer replacement costs 1-5 dollars in parts and takes 15-30 minutes saving 5-30 dollars per year in water costs. The repair pays for itself within days to weeks. Even hiring a plumber at 100-200 dollars typically pays back within 1-3 years. Beyond cost savings fixing leaks conserves water, reduces strain on treatment infrastructure, and prevents potential water damage from worsening leaks.
References
Reviewed by Daniel Agrici, Founder & Lead Developer · Editorial policy