Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Plumbing
Fixture Unit Demand Calculator
Computes the total plumbing demand load in fixture units for toilets, sinks, showers, and appliances, then converts it to a peak flow estimate for pipe sizing. Use it when designing or auditing a building's water supply system.
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
| Fixture Unit Demand Calculator | Water Pressure Loss Calculator | |
|---|---|---|
| Category | Plumbing | Plumbing |
| Inputs required | 5 | 3 |
| Result | Peak Demand (GPM) | Pressure Loss (PSI) |
| What it does | Computes the total plumbing demand load in fixture units for toilets, sinks, showers, and appliances, then converts it to a peak flow estimate for pipe sizing. Use it when designing or auditing a building's water supply system. | 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. |