Plumbing weighted fixture demand units calculator

Calculate connected demand units and coincident demand units with your own figures.

Your numbers

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

Use connected demand units and coincident demand units to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Fixture quantities (counts)
4,3,2
User-assigned demand weights per fixture (units)
1,2,3
User-selected coincidence factor (fraction)
0.7
Connected demand units
16
Coincident demand units
11.2

Try another scenario

Fixture quantities (counts)
[5, 3, 2]
User-assigned demand weights per fixture (units)
[1, 2, 3]
User-selected coincidence factor (fraction)
0.7
Connected demand units
17
Coincident demand units
11.9
Calculation method

Calculation method

Connected demand units

Weighted fixture demand sum × user-selected coincidence factor; no code lookup or flow conversion.

Coincident demand units

Weighted fixture demand sum × user-selected coincidence factor; no code lookup or flow conversion.

Symbols and units
a
Fixture quantities (counts)
b
User-assigned demand weights per fixture (units)
c
User-selected coincidence factor (fraction)

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; Weighted fixture demand sum × user-selected coincidence factor; no code lookup or flow conversion. 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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