Water Usage Calculator
Enter the water used per minute or per use, then add how often you use it. Add each fixture’s litres per use and uses per week, then enter your combined supply and wastewater rate per m³. Source period (days); Target period (days); Optional price per m³; Currency label.
A QUICK WALKTHROUGH
How to use this tool
- Choose multiple fixtures, or keep the existing flow/per-use volume mode.
- Add up to 20 fixtures with litres per use and uses per week, and enter your combined rate per m³.
- Review weekly and annual volume and annual variable cost in your rate’s currency.
- Occupants → Source period (days) → Target period (days) → Calculate → Full report.
Use your own measurements
Uses your entries only. It does not represent a local typical value, utility bill, fixture rating, or measured flow.
Local and unit-aware
Formula: water per use × uses per day; weekly = daily × 7; monthly = daily × 30. Values stay in your browser and are not uploaded or stored.
Target period volume
Source period volume = Per day × Source period (days); Target period volume = Source period volume × Target period (days) / Source period (days); Per occupant = Target period volume / Occupants; Per occupant per day = Per occupant / Target period (days); Cost per occupant = (Target period volume / 1000 × Optional price per m³) / Occupants. Undefined (zero occupants or no price).
GOOD TO KNOW
Common questions
What does the estimate include?
A flow rate is treated as litres or gallons per minute; the result is flow rate × minutes per use × uses per day. A per-use amount is multiplied directly by frequency.
Does this predict my water bill?
Weekly litres = sum of litres per use × uses per week. Annual litres = weekly × 52. Annual cost = annual litres ÷ 1,000 × your rate. Excludes fixed charges, taxes not included in your rate, and water-heating energy. This is an estimate, not a utility bill. Use one currency throughout. Results use the same currency as your rate; no tariff lookup is performed.
Full report
Raw inputs; Parsed inputs; Fixture contribution; Model; Copy report; Download TXT. Values stay in your browser and are not uploaded or stored.