Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Plumbing
Plumbing Fixture Unit Calculator
Calculates total plumbing fixture units (FU) for a building by summing standardized load values for toilets, sinks, showers, and tubs. Use it to size drain, waste, and vent (DWV) or water supply piping per code.
Fill in the required fields to see your result.
Plumbing
Water Pressure Loss Calculator
Calculates friction-induced pressure drop along a water pipe using the Hazen-Williams equation. Use it when designing irrigation systems, fire suppression lines, or building water supply networks where adequate pressure at the endpoint matters.
Fill in the required fields to see your result.
Key differences
| Plumbing Fixture Unit Calculator | Water Pressure Loss Calculator | |
|---|---|---|
| Category | Plumbing | Plumbing |
| Inputs required | 4 | 3 |
| Result | Total Fixture Units (FU) | Pressure Loss (PSI) |
| What it does | Calculates total plumbing fixture units (FU) for a building by summing standardized load values for toilets, sinks, showers, and tubs. Use it to size drain, waste, and vent (DWV) or water supply piping per code. | Calculates friction-induced pressure drop along a water pipe using the Hazen-Williams equation. Use it when designing irrigation systems, fire suppression lines, or building water supply networks where adequate pressure at the endpoint matters. |