Fictional worked example

Price the marginal units when a leak crosses a water tier

A household already uses 9 m³ against a 10 m³ tier limit. A sample leak of 0.1 L/min for 14 days adds 2.016 m³, so part of the excess enters the next block.

Open Calculator

Inputs and calculation

All leaked water at the low rate
Tool inputValue
CurrencyUSD
Volume or billing unitm³
Flow (L/min)0.1
Days or equivalent sessions14
Price per billing unit (USD)2

0.1 L/min × 1,440 min/day × 14 days = 2016 L. Divide by 1,000 for m³, then multiply by 2 for USD 4.03.

Tool result · USD 4.03

All leaked water at the high rate
Tool inputValue
CurrencyUSD
Volume or billing unitm³
Flow (L/min)0.1
Days or equivalent sessions14
Price per billing unit (USD)4

0.1 L/min × 1,440 min/day × 14 days = 2016 L. Divide by 1,000 for m³, then multiply by 4 for USD 8.06.

Tool result · USD 8.06

What the comparison shows

Only the first 1 m³ costs 2.00. The remaining 1.016 m³ costs 4.064, so the sample tiered increment is 6.06. The two calculator runs bracket that increment.

Assumptions and limits

The leak tool prices one flat rate. Use the Bill Calculator for the two full tiered bills, or calculate the split by hand.

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