免费卫生器具当量计算器
计算住宅或商业建筑的供水器具当量，用于管道选型。
Total Fixture Units
15.5 WSFU
Total Fixture Units vs Toilets (Flush Valve)
公式
## 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)**.
计算示例
2 toilets, 3 sinks, 2 showers, 1 dishwasher, 1 washer.
- 01Toilets: 2 x 2.5 = 5
- 02Sinks: 3 x 1 = 3
- 03Showers: 2 x 2 = 4
- 04Dishwasher: 1 x 1.5 = 1.5
- 05Washer: 1 x 2 = 2
- 06Total = 15.5 WSFU
- 07Peak GPM = 5 x sqrt(15.5) = 19.7 GPM
常见问题
What is a fixture unit?
A fixture unit (FU) is a relative measure of the probable hydraulic demand of a plumbing fixture. One fixture unit originally equaled about 7.5 GPM, but modern codes use tables rather than a direct conversion.
Are these values code-compliant?
This calculator uses typical residential WSFU values. Always verify against your local plumbing code (IPC, UPC, or local amendments) for the final design.
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