Water Usage Calculator

Calculation Method

The calculator estimates monthly water usage by summing daily consumption from each source:

1. Showers: showers/day × duration × flow rate
2. Toilets: flushes/day × volume per flush
3. Faucets: minutes/day × flow rate
4. Dishwashing: loads/week × gallons per load (or hand-wash minutes × flow rate)
5. Laundry: loads/week × gallons per load
6. Baths: baths/week × gallons per bath
7. Irrigation: days/week × minutes × flow rate
8. Leaks: ~5 gallons/day per dripping faucet

Daily totals are multiplied by 30 to estimate the monthly total.

Average Water Usage

• US average: ~80–100 gallons per person per day
• 2-person household: ~5,000–6,000 gallons per month
• 4-person household: ~10,000–12,000 gallons per month

Water Saving Tips

• Install low-flow showerheads (1.5 gal/min vs 2.5 gal/min)
• Fix leaking faucets promptly — a single drip wastes ~1,800 gal/year
• Use a dishwasher instead of hand washing (uses 3–5x less water)
• Upgrade to high-efficiency (HE) washing machines
• Water lawns early morning or late evening to reduce evaporation
• Install dual-flush toilets (0.8/1.6 gal)
• Turn off faucet while brushing teeth (saves ~3 gal/session)