Plumbing domestic water balance calculator

Calculate unaccounted balance and accounted fraction with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use unaccounted balance and accounted fraction to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Metered supply (m³)
120
Accounted uses (m³)
60,25,15
Unaccounted balance (m³)
20
Accounted fraction (%)
83.333333

Try another scenario

Metered supply (m³)
121
Accounted uses (m³)
[60, 25, 15]
Unaccounted balance (m³)
21
Accounted fraction (%)
82.644628
Calculation method

Calculation method

Unaccounted balance (m³)

Supply minus accounted uses; a negative balance flags inconsistent or differently bounded observations.

Accounted fraction (%)

Supply minus accounted uses; a negative balance flags inconsistent or differently bounded observations.

Symbols and units
a
Metered supply (m³)
b
Accounted uses (m³)

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • User-supplied measurements and assumptions; Supply minus accounted uses; a negative balance flags inconsistent or differently bounded observations. Supported limits: Finite numeric values bounded to 1e9 magnitude; lists and tables contain 1–100 records unless a stricter bound is stated. Inputs use the units shown. Lists explicitly paired by a method must have matching lengths; independent polynomial coefficient vectors may differ. Respect stated physical, interpolation, policy and computational domain limits.
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