Head Loss Calc Plumb
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Description
Head Loss Calculator helps you calculate friction and pressure loss in water piping systems using the Hazen-Williams equation, Darcy-Weisbach formula, and Swamee-Jain friction factor method. Instantly determine pressure drop in any pipe material over any distance. Support 11 pipe materials from copper to galvanized steel with accurate C-coefficients. Works 100% offline on the job site. Useful for sizing booster pumps, pressure reducing valves, and water supply systems.
FEATURES
2 Calculation Methods: Hazen-Williams equation (traditional plumbing) and Darcy-Weisbach formula with Swamee-Jain friction factor (engineering method)
11 Pipe Materials: Copper, galvanized steel, PVC, CPVC, PEX, cast iron, wrought iron, concrete, asbestos cement, and other materials with accurate C-coefficients and roughness factors
Flow Rate Units: Support GPM (US gallons per minute), L/s (liters per second), L/min, CFM (cubic feet per minute)
Pipe Diameter Range: Calculate loss for 1/2-inch through 4-inch and larger pipes
Flow Velocity Calculation: Automatic velocity calculation with high-velocity warning (>8 ft/s indicates sizing issue)
Results in Multiple Units: Pressure loss displayed in PSI and feet of head for system analysis
Pipe Length Support: Calculate loss for pipe runs from 10 feet to 500+ feet
HOW IT WORKS
1. Enter water flow rate (GPM) from fixture unit calculations
2. Select pipe material (copper, PVC, galvanized steel, etc.)
3. Enter pipe diameter and total run length
4. Choose calculation method (Hazen-Williams or Darcy-Weisbach)
5. See pressure loss in PSI and feet of head
6. Check velocity warning - velocities >8 ft/s indicate undersized pipe
PERFECT FOR
Plumbers designing water supply systems with booster pumps
Engineers calculating pressure loss for system analysis
Contractors estimating pump requirements
Mechanical estimators sizing pressure tanks and regulators
Plumbing inspectors verifying system design
Facilities managers troubleshooting low pressure issues
OPTIONAL PRO UPGRADE — $2.99 ONE-TIME IN-APP PURCHASE
The following features require a separate one-time in-app purchase. They are not required to use the calculator:
Unlimited saved calculation history
PDF export of results
Dark theme
Ad-free experience
STANDARDS & COMPLIANCE
Hazen-Williams Equation - traditional plumbing industry standard, Darcy-Weisbach Formula with Swamee-Jain Friction Factor - engineering standards for pipe friction calculation, Material-specific C-coefficients and roughness factors per engineering references, IPC water supply system design guidance.
PERFECT FOR
Plumbing engineers and designers
Plumbing contractors and estimators
Mechanical engineers
Facilities and building managers
Plumbing inspectors
Pump and equipment specialists
OFFLINE & PRIVACY
Works 100% offline - calculate pressure loss anywhere
No account required - instant calculations
No data collection - all results stored locally
No internet dependency
Part of PlumbTools Suite - professional plumbing and engineering calculator tools. Calculate pressure loss accurately, size pumps correctly, and optimize water system design with precise head loss calculations.