Household Water Use Worksheet
Total entered flow-based and fixed-volume fixture uses into daily, period and per-person water estimates.
YOUR CALCULATION
Result
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Calculation steps
Work through one step at a time or reveal the complete calculation. The steps use your current inputs.
How to calculate
For a flow row multiply the measured flow by duration. For a volume row use the entered amount directly and require zero in the duration column. Multiply each by average daily uses and total the rows.
Flow use=flow×duration×uses/day; fixed-volume use=volume/use×uses/day
Worked example
The example shower uses 128 L/day, tap 48 L/day and toilet 30 L/day: total 206 L/day, or 6180 L in 30 days. Dividing by four members gives 51.5 L/person/day.
Assumptions and input details
Counts can be fractional averages. Enter household-total daily uses, not per-person uses, to avoid multiplying twice. Volume-row duration must be zero. Only entered fixtures are included; no household baseline, tariff, water-saving target or appliance rating is inferred. Annual figures use 365 identical days. Cost excludes fixed charges and taxes unless already reflected in your entered unit rate; a blank rate stays unknown.
Unit definitions
Unit selection is independent of language. Each selector contains only units for its physical quantity. Calculations use defined base units internally.
The 36 volume definitions distinguish US liquid, US dry and Imperial measures. Cups carry an explicit definition. Japanese shō is 2401/1331 L and a gō is one tenth of it; the explicitly labelled 180 mL rice cup is separate.
Regional measures are not interchangeable merely because their names look similar. This is a documented selection, not a claim to include every historical unit.
NIST measurement tables · UK Imperial definitions · Japanese traditional units · Mainland China and Hong Kong unit distinctions
Using this calculator
Can I enter my own problem?
Yes. Replace the example values with your own inputs. The result, calculation steps, tables and applicable diagrams update from those inputs. Blank or invalid values clear the result; example values are never silently substituted for missing inputs.
Are the results exact?
Results use floating-point arithmetic and displayed rounding. Read the formula, assumptions and any stated data precision before interpreting the result.
Is my input uploaded?
The calculation runs in your browser. No account, file upload or external AI service is required. Inputs are not saved between page reloads.
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