Fictional worked example

Estimate monthly laundry water from loads

A household uses 55 L per cycle and washes sixteen loads in four weeks. Enter sixteen days at one shared load per day to represent the number of loads.

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Inputs and calculation

Sixteen loads
Tool inputValue
CurrencyUSD
Volume or billing unitm³
Activity measurementFixed volume per event
Liters per event55
Occurrences per person per day1
People (1 for shared use)1
Days or equivalent sessions16
Price per billing unit (USD)3

55 L per event × 1 × 1 × 16 = 880 L. Divide by 1,000 for m³ and multiply by 3 for USD 2.64.

Tool result · USD 2.64

Twelve fuller loads
Tool inputValue
CurrencyUSD
Volume or billing unitm³
Activity measurementFixed volume per event
Liters per event55
Occurrences per person per day1
People (1 for shared use)1
Days or equivalent sessions12
Price per billing unit (USD)3

55 L per event × 1 × 1 × 12 = 660 L. Divide by 1,000 for m³ and multiply by 3 for USD 1.98.

Tool result · USD 1.98

What the comparison shows

The difference is 220 L. This comparison assumes fuller loads do not increase the water drawn per cycle.

Assumptions and limits

Use measured or documented liters per cycle. Water use can vary with program and load sensing.

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