# Head Loss Calc Plumb — Hazen-Williams Friction

> Hazen-Williams Friction (iPhone/iPad app by Rizvan Adzhoian.)

- Source: https://appshunter.io/ios/app/head-loss-calc-plumb/id6765783531 (this page in markdown: same URL + `.md`)
- Developer: [Rizvan Adzhoian](https://appshunter.io/developer/1891746079)
- Category: Utilities, Business
- Price: $0.99 with in-app purchases
- Age rating: 17+
- Requires: iOS 13.0 · 30 MB
- Languages: English
- Released: 2026-05-04
- Data updated: 2026-06-06
- User reviews in markdown: https://appshunter.io/ios/app/head-loss-calc-plumb/id6765783531/reviews.md

## What is Head Loss Calc Plumb?

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.

## Pricing and in-app purchases

Base price: $0.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Pro Unlock | $2.99 | one-time |



## Version history (last 2 releases)

### 1.0.4 — 2026-05-18

What's new:
- Updated metadata for clarity per App Store guidelines
- Optional Pro upgrade is a separate one-time in-app purchase (not required for calculator features)

### 1.0.3 — 2026-05-04

No release notes.

## More apps by Rizvan Adzhoian

- [Conduit Fill Calculator-NEC](https://appshunter.io/ios/app/conduit-fill-calculator-nec/id6761846849)
- [Electrical Load Calc NEC](https://appshunter.io/ios/app/electrical-load-calc-nec/id6763250945)
- [Transformer Calc NEC](https://appshunter.io/ios/app/transformer-calc-nec/id6763311943)
- [Voltage Drop Calc NEC](https://appshunter.io/ios/app/voltage-drop-calc-nec/id6763312448)
- [Grounding Size Calc NEC](https://appshunter.io/ios/app/grounding-size-calc-nec/id6763312724)
- [Breaker Size Calc NEC](https://appshunter.io/ios/app/breaker-size-calc-nec/id6763312865)

All apps by Rizvan Adzhoian: https://appshunter.io/developer/1891746079

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-06.*