Water Usage & Conservation Calculator
Estimate your daily and monthly household water usage and see how much water (and money) you can save with simple conservation measures.
Household Information
Average US rate ≈ $0.004/gallon ($4.00 per 1,000 gallons)Daily Water Activities (per person)
Household Activities (total per day)
Conservation Measures (optional)
Check the measures you are willing to adopt to see potential savings.Formulas Used
Shower usage (gal/day):
Shower_gal = Showers/day × Duration(min) × Flow_rate(gal/min) × People
Toilet usage (gal/day):
Toilet_gal = Flushes/day × Gallons/flush × People
Faucet usage (gal/day):
Faucet_gal = Minutes/day × Flow_rate(gal/min) × People
Dishwasher usage (gal/day):
Dish_gal = Loads/day × Gallons/load
Laundry usage (gal/day):
Laundry_gal = (Loads/week ÷ 7) × Gallons/load
Outdoor usage (gal/day):
Outdoor_gal = (Minutes/week ÷ 7) × Flow_rate(gal/min)
Total daily usage:
Total = Shower + Toilet + Faucet + Dishwasher + Laundry + Outdoor
Monthly usage: Total_daily × 30.44
Annual usage: Total_daily × 365
Cost: Usage(gal) × Rate($/gal)
Assumptions & References
- US average water usage: ~80–100 gallons per person per day indoors (EPA WaterSense).
- Average US water rate: ~$0.004/gallon ($4.00 per 1,000 gallons) — varies widely by region (AWWA 2023).
- Standard shower head flow: 2.5 gal/min; WaterSense certified: ≤2.0 gal/min (EPA).
- Pre-1994 toilets: up to 3.5–7 gal/flush; federal standard since 1994: 1.6 gal/flush; HET: 1.28 gal/flush.
- Standard faucet: 2.2 gal/min; WaterSense aerator: ≤1.5 gal/min (EPA).
- Older dishwashers: ~6 gal/load; Energy Star certified: ≤3.5 gal/load (DOE).
- Top-loading washers: 25–40 gal/load; front-loading HE: 15–25 gal/load (ENERGY STAR).
- Typical garden hose/sprinkler: 5–10 gal/min (varies by nozzle and pressure).
- Leaky faucets/toilets can waste 10+ gallons per person per day (EPA).
- Turning off tap while brushing teeth saves ~4 gallons per person per day (EPA WaterSense).
- Month assumed as 30.44 days (365 ÷ 12).
- This calculator provides estimates; actual usage varies by appliance age, pressure, and habits.