Fixture Unit Calculator

Add up water supply fixture units (WSFU) for residential or commercial buildings to determine pipe sizing requirements.

Total Fixture Units

15.5 WSFU

Estimated Peak Demand19.7 GPM

Total Fixture Units vs Toilets (Flush Valve)

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सूत्र

## Fixture Unit Method Each plumbing fixture is assigned a unit value based on its flow demand. The total WSFU determines minimum pipe size per code tables. A quick estimate for peak demand in GPM uses the Hunter curve approximation: **GPM = 5 x sqrt(WSFU)**.

हल किया गया उदाहरण

2 toilets, 3 sinks, 2 showers, 1 dishwasher, 1 washer.

  1. 01Toilets: 2 x 2.5 = 5
  2. 02Sinks: 3 x 1 = 3
  3. 03Showers: 2 x 2 = 4
  4. 04Dishwasher: 1 x 1.5 = 1.5
  5. 05Washer: 1 x 2 = 2
  6. 06Total = 15.5 WSFU
  7. 07Peak GPM = 5 x sqrt(15.5) = 19.7 GPM