All Calculators
💧

Water Usage Tracker

Track per-capita water footprints, partition green/blue/grey usage, and benchmark against WHO minimums with ISO 14046-aligned methodology.

Household Profile

people
days

Daily Water Use (Blue)

L/day

Assumes 10 min x 2 showers @ 13 L/min.

L/day
L/day
L/day
L/day
L/day

Green & Grey Components

L/day

Counts as green water offsetting blue demand.

g/day

E.g., BOD/COD from greywater discharge.

mg/L
mg/L

Efficiency Scenario

%

Low-flow fixtures, behavioral changes.

%

Drip irrigation, xeriscaping.

%

Estimate of hidden losses; can be eliminated.

📖 How to Use

Input average daily volumes for each use category. Rainwater captured offsets blue water withdrawals. Provide pollutant load and water-quality limits to compute grey water footprint. Adjust efficiency sliders to estimate savings from retrofit measures.

🧮 Formula Reference

WFtotal = WFgreen + WFblue + WFgrey
WFgrey = Load (mg/day) ÷ (Cmax − Cnat)
Per-capita = Total daily use ÷ Occupants
Efficiency savings = Baseline − (Baseline × reduction%)

⚠️ Notes

  • WHO emergency minimum is 15–20 L/person/day; sustainable planning targets vary by region.
  • For multiple pollutants, take the maximum grey water footprint across contaminants.
  • Document functional unit, geography, and temporal coverage to comply with ISO 14046.

🔗 References