# McCalc Fusion Calculator — HDPE/PP Pressure Calculator

> Calculates HDPE/PP pipe fusion pressure based on machine, pipe size, and pressure requirements. (iPhone/iPad app by McElroy Manufacturing, Inc..)

- Source: https://appshunter.io/ios/app/mccalc-fusion-calculator/id376891708 (this page in markdown: same URL + `.md`)
- Developer: [McElroy Manufacturing, Inc.](https://appshunter.io/developer/376891711)
- Category: Business, Utilities
- Price: Free
- Rating: 3.40/5 from 18 App Store ratings · 28 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.4 · 4 MB
- Languages: American English
- Released: 2010-06-15
- Data updated: 2026-06-10
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/mccalc-fusion-calculator/id376891708/reviews.md

## What is McCalc Fusion Calculator?

The McCalc Fusion Pressure Calculator is designed to help you quickly find the correct fusion pressure for your job.

To properly heat-fuse polyethylene pipe, the fusion pressure must be adjusted so the pipe manufacturer's recommended interfacial pressure is achieved.

McCalc takes the guesswork out of HDPE and Polypropylene pipe fusion.  By selecting your McElroy fusion machine and entering your pipe size and pressure requirements, the recommended theoretical gauge pressure may be calculated.

McCalc offers the following features:

- Easy selection of any of McElroy's hydraulic fusion machines.
- Selection from nine different international standards for HDPE and Polypropylene pipe fusion.
- Pipe size entry in IPS, DIPS, O.D., or JIS units.
- Wall thickness entry using the pipe's dimensional ratio or actual wall thickness.
- Interfacial pressure and drag pressure entry in units of psi, bar, kg/cm², or MPa.
- Multiple-language support including English, Spanish, and Portuguese.

## Key features

- Select McElroy fusion machines
- Choose from nine international standards
- Enter pipe size in multiple units
- Input wall thickness via dimensional ratio or actual thickness
- Specify interfacial and drag pressure
- Supports English, Spanish, and Portuguese

## Recent user reviews (10 of 28)

All indexed reviews: https://appshunter.io/ios/app/mccalc-fusion-calculator/id376891708/reviews.md

### 1/5 — Update Issue

*2024-07-08*

After the new update the screen if just blank, nothing appears.

### 1/5 — Mc Clac

*2024-06-24, version 3.0.1*

Does not work go back to old app

### 4/5 — Nice update but still has flaws, just my opinion.

*2024-06-23*

The new update to this app that took place over the weekend is a nice update. But now you’ve lost the separation between the PP and PE selector at the bottom of the page, and the proper specification selector becomes more difficult to understand unless you know exactly which one you need. Granted this is taught in training, yet can be easily forgotten in the field when you have nothing to reference. It would be nice to give a reference page to the proper specification selection based on area of the world and material as a separate click item at the top of the page. When you were doing PP before there was only 3 selections in the PP category, now there is 21 listed over all for both types. The separation of the 2 materials was much better and easier to navigate. A legend of the Green, Orange and Yellow spots would be nice also. Most of us know this that have been doing this for many years, but many newcomers may not. We don’t want it to be a guessing game for those that don’t. I like the new sound feature included on the ending of each perimeter area for heat soak, open, and cooling, but the sound needs to be louder and more of an attention getter, than a soft cutisy tune. Overall McElroy is the leader in the fusion industry and happy to be a distributor for them. Keep up the good work!

### 1/5 — What?

*2022-02-02*

Too detailed.
Won’t save input.
Have had over a year, and has never helped me.

### 1/5 — Needs to be updated

*2021-11-19, version 2.4.0*

The only thing this app is good for is to get you your pressures in numbers because as soon as you close the app and re-open it everything is gone

### 1/5 — CRash!!

*2021-09-10, version 2.4.0*

App crashes, and when you reopen it, all stored numbers are gone including timer . Maddeningly when you are in the middle of heat soak!

### 4/5 — Latest update came with issues

*2020-09-30*

The timer feature is no longer visible besides the start/reset buttons. I can’t see the time. And the black background with the blue lettering in the selection menus make it difficult to read out in the sun which is usually the only place I fuse pipe or use this app. Overall it’s a good app but needs a little attention.

Update:
Previous issues were due to my iPhone being on dark mode. Still would be nice for the app to compatible with dark mode.

### 1/5 — Impossible to use

*2020-08-18*

The update on 8/16/20 has made the app impossible to use, you aren’t able to switch between pipe dimensions ips/dips at all. The black background makes it extremely difficult to read the pressures, the font is basically the same color as the background on all the input interface, I could deal with the random crashing of the app, but now it is completely unusable. Revert or fix the visuals.

### 1/5 — Heat soak value does not adjust

*2020-08-12, version 2.3.8*

The bead up number changes accordingly when the pressure unit is changed. The heat soak number does not change when the pressure unit is changed. Be aware. This could cause fusion failures.

### 2/5 — App keeps shutting down and resetting so times and pressures disappear.

*2019-10-23, version 2.3.8*

Could you repair this issue. New model phone and always up to date. App won’t stay running. Keeps closing on its own and when I open it back up all my settings are reset except time running.....

## Frequently asked questions about McCalc Fusion Calculator

### What does the McCalc Fusion Calculator do?

The McCalc Fusion Calculator helps users determine the correct fusion pressure for HDPE and Polypropylene pipe jobs. It simplifies the process by allowing users to select their McElroy fusion machine and input pipe size and pressure requirements to calculate the recommended theoretical gauge pressure.

### What are the key features of this app?

Key features include easy selection of McElroy hydraulic fusion machines, choice from nine international standards for pipe fusion, flexible pipe size entry in various units (IPS, DIPS, O.D., JIS), wall thickness input via dimensional ratio or actual thickness, and the ability to enter interfacial and drag pressure in multiple units (psi, bar, kg/cm², MPa). It also offers multi-language support.

### Is this app free to use?

Yes, the application is available for free. There are no in-app purchases or advertisements mentioned, indicating a completely free user experience.

### What pipe sizes and standards does the app support?

The app supports pipe size entry in IPS, DIPS, O.D., or JIS units. It also offers selection from nine different international standards for HDPE and Polypropylene pipe fusion, providing broad compatibility for various job requirements.

### Who would benefit from using this calculator?

This calculator is designed for professionals involved in heat-fusing polyethylene pipe, such as plumbers, contractors, and engineers. It is particularly useful for those working with HDPE and Polypropylene pipes who need to ensure the correct interfacial pressure is achieved according to manufacturer specifications.

## Version history (last 5 releases)

### 3.1.0 — 2026-01-12

Added the AST F3722-24 standard

### 3.0.7 — 2025-04-18

Removed ASTM F2620-12. Added ASTM F2620-24

### 3.0.6 — 2025-02-25

Fixed a translation bug

### 3.0.5 — 2025-02-20

Added Spanish support

### 3.0.2 — 2024-08-07

Fixed rare crash

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## More apps by McElroy Manufacturing, Inc.

- [INFUSION26](https://appshunter.io/ios/app/infusion26/id1639135956)
- [Equipment Inspections](https://appshunter.io/ios/app/equipment-inspections/id1640551789)
- [McElroy Vault](https://appshunter.io/ios/app/mcelroy-vault/id6670502434)

All apps by McElroy Manufacturing, Inc.: https://appshunter.io/developer/376891711

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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 2026-06-10.*