Fictional worked example

Read a four-person flat-rate water bill

Four people reviewing a 24 m³ bill want to separate the supplier’s water cost from a budget allocation per person.

Open Calculator

Inputs and calculation

Original bill
Tool inputValue
CurrencyUSD
UtilityWater
Volume or billing unitm³
Metered usage24
Tariff typeFlat rate
Price per billing unit (USD)2.8
Service fee (USD)14
Tax on usage plus service fee (%)0

24 × 2.80 + 14 = 81.20, or 20.30 per person.

Tool result · USD 81.20

Reduce shared use by 5 m³
Tool inputValue
CurrencyUSD
UtilityWater
Volume or billing unitm³
Metered usage19
Tariff typeFlat rate
Price per billing unit (USD)2.8
Service fee (USD)14
Tax on usage plus service fee (%)0

19 × 2.80 + 14 = 67.20, or 16.80 per person.

Tool result · USD 67.20

What the comparison shows

An outdoor water reduction benefits the shared budget by 14.00 even when each person’s indoor habits stay the same.

Assumptions and limits

Equal sharing is for budgeting. The meter cannot identify individual use.

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