Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Plumbing
Plumbing Fixture Unit Calculator
Add up the drainage fixture units (DFU) for every toilet, sink, shower, bathtub, and appliance in a building to find the correct supply and drain pipe sizes per plumbing code. Essential for new construction, additions, or remodels.
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 | 5 | 3 |
| Result | Total Fixture Units (FU) | Pressure Loss (PSI) |
| What it does | Add up the drainage fixture units (DFU) for every toilet, sink, shower, bathtub, and appliance in a building to find the correct supply and drain pipe sizes per plumbing code. Essential for new construction, additions, or remodels. | 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. |