# Moody Chart Calculator

> Calculates friction factor using Reynolds Number and Relative Roughness. (iPhone/iPad app by Ali Batayneh.)

- Source: https://appshunter.io/ios/app/moody-chart-calculator/id1202447201 (this page in markdown: same URL + `.md`)
- Developer: [Ali Batayneh](https://appshunter.io/developer/1876400685)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Rating: 5.00/5 from 6 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.1 · 49 MB
- Languages: English
- Released: 2017-02-06
- Data updated: 2026-08-18
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/moody-chart-calculator/id1202447201/reviews.md

## What is Moody Chart Calculator?

The long-awaited Moody Chart Calculator is finally on the App Store!
Calculate the Darcy friction factor instantly from Reynolds Number and Relative Roughness — no more squinting at a printed chart or interpolating by eye.
Whether you're a student, a practicing engineer, or just need a fast, reliable friction factor, Moody Chart Calculator delivers accurate results in seconds.

Features:
Basic and Pro calculation modes
Save formulas to custom collections
Review your full calculation history
Covers laminar, transitional, and turbulent flow

Built by an engineer, for engineers. Download now and get back to solving real problems.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Key features

- Friction factor calculation
- Reynolds Number input
- Relative Roughness input
- Engineering utility

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Pro Monthly | $1.99 | per month |


## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/moody-chart-calculator/id1202447201/reviews.md

### 5/5 — Simple and clean

*2026-06-12*

Such a simple and clean app, love it!

### 5/5 — Perfect

*2017-11-17*

Straight forward, easy to use, useful for fluid mechanics. Gets the job done!

### 5/5 — Great Calculator

*2017-02-08*

Efficient and very straight forward to use! Highly recommended!

### 5/5 — Nice app

*2017-02-07*

Nice app. It does what I need it to do and it's clean.

## Frequently asked questions about Moody Chart Calculator

### What is Moody Chart Calculator used for?

Moody Chart Calculator is used to calculate a friction factor based on the Reynolds Number and Relative Roughness. This is a common calculation in fluid dynamics and engineering.

### Is Moody Chart Calculator free to use?

Yes, Moody Chart Calculator is available for free on the app store. There are no costs associated with downloading or using its core functionality.

### What devices does Moody Chart Calculator support?

Moody Chart Calculator is designed for iOS devices, specifically supporting iPhone and iPod. It is not currently available for Android devices.

### How often is Moody Chart Calculator updated?

Moody Chart Calculator was last updated on February 6, 2017, with version 1.0. As of now, there is no indication of frequent updates.

### What is the age rating for Moody Chart Calculator?

Moody Chart Calculator has an age rating of 4+. This indicates it is suitable for users of all ages, with no mature content.

### What is the user rating for Moody Chart Calculator?

Moody Chart Calculator has an excellent user rating of 5.0 stars, based on 5 ratings. This suggests a very positive user experience.

### Does Moody Chart Calculator have ads?

No, Moody Chart Calculator does not contain advertisements. Users can perform calculations without interruption.

## Version history (last 3 releases)

### 2.0.3 — 2026-06-12

Add free trail

### 2.0.1 — 2026-06-06

Bug Fixes

### 1.0 — 2017-02-06

No release notes.

## Related topics

[elcocalc](https://appshunter.io/ios/topics/elcocalc)

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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 2026-08-18.*