# Mechanical Engineering Toolkit — Engineering Equations,Formulas

> Engineering equations, formulas, and reference material for mechanical engineers and students. (iPhone/iPad app by APPS BAY LIMITED.)

- Source: https://appshunter.io/ios/app/mechanical-engineering-toolkit/id1601099443 (this page in markdown: same URL + `.md`)
- Developer: [APPS BAY LIMITED](https://appshunter.io/developer/1599035519)
- Category: Utilities, Education
- Price: Free with in-app purchases
- Rating: 4.80/5 from 64 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 34 MB
- Languages: American English, Chinese (Simplified, China), Chinese (Traditional, Taiwan)
- Released: 2022-01-11
- Data updated: 2026-09-09
- Monetization: ad-supported
- User reviews in markdown: https://appshunter.io/ios/app/mechanical-engineering-toolkit/id1601099443/reviews.md

## What is Mechanical Engineering Toolkit?

Mechanical Engineering Toolkit is a professional engineering calculator for students, researchers, and practicing engineers. Choose a formula, enter your variables, and get instant results — with calculation steps, formulas, diagrams, and unit conversions shown along the way. Switch between SI and Imperial units anytime, save favorites, and find the right tool fast with recommendations by major. Save your inputs as named projects, and export any result as text, image, CSV or PDF.

Categories and tools:

Mechanics of Material
• Moments of inertia of plane areas
• Force-displacement relation of a bar
• Torsion formula and angle of twist
• Flexure formula of a beam
• Transverse shear stress
• Deflections and slopes of cantilever and simple beams
• Plane stress transformation and Mohr's circle
• Principal stresses and planes
• Spherical shell and thin-walled pressure vessel stresses
• Buckling load of a column
• Thermal deformation and stress
• Combined loading
• Bolted / riveted joints
• Fatigue safety factor
• Shaft power and torque

Statics
• Centroid of an area
• Resultant of a force system
• Beam reactions
• 2D truss analysis

Machine Design
• Helical compression springs
• Spur gear geometry and stresses
• Shaft fatigue design (DE-Goodman)
• Bearing L10 life
• Belt and chain drives
• Bolt preload / torque-tension
• Fillet weld strength
• Press / shrink-fit interference
• Shaft critical speed (Dunkerley)
• Beam natural frequency (five end conditions)
• Torsional natural frequency (one or two rotors)

Fluids & Thermal
• Reynolds number and flow regime
• Pipe pressure drop (Darcy-Weisbach with Colebrook)
• Pump and fan power
• Composite wall conduction
• Fin efficiency
• Heat exchanger sizing by LMTD

Theory of Elasticity
• Constitutive relation of linear elastic material
• Stress/strain of linear elastic material

Composite Material
• Lamina and laminate stress/strain
• Lamina engineering constants
• Laminate plane and 3D properties
• Rule of mixtures
• Failure criteria (Tsai-Hill, Tsai-Wu)

Reference Tables
• Drill & tap chart (metric and imperial thread series)
• ISO 286 fits & tolerances
• Standard sections (AISC W, IPE, HEB)
• Unit converter

No account required. Works offline. Available in English, Chinese, German, French, and Japanese.

## Key features

- Engineering equations and formulas
- Mechanics of Material calculations
- Theory of Elasticity formulas
- Composite Material properties
- Reference material
- Variable input for calculations

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/mechanical-engineering-toolkit/id1601099443/reviews.md

### 4/5 — Payment Option

*2025-12-14*

Can you add a payment option so i can remove the advertisements please

**Developer response:** Thanks for the feedback! We don't have an ad-removal purchase option yet, but it's a great idea and we've added it to our list for future updates. Appreciate you taking the time to share this.

### 4/5 — Ok

*2025-05-09*

Wish it had a section on fluids or thermo :)

**Developer response:** Thanks for the suggestion! We've added a Thermal Deformation & Stress calculator in version 1.2.0 — you'll find it under Mechanics of Materials. A full fluids/thermodynamics section isn't available yet, but we've noted the request for future updates!

### 5/5 — Prof K.Prasad.

*2024-02-11*

Very Useful Information for Beginners and Practicing Engineers.

**Developer response:** Thank you so much for the kind words, Prof. Prasad! Glad the app has been helpful for both students and practicing engineers.

### 5/5 — Great

*2022-09-09*

Excellent

**Developer response:** Thanks so much for the great review! Really appreciate you taking the time.

## Frequently asked questions about Mechanical Engineering Toolkit

### What is the Mechanical Engineering Toolkit?

The Mechanical Engineering Toolkit is a professional engineering calculator designed for students and industrial engineers. It offers a wide range of engineering equations, formulas, instructions, and reference material for various mechanical engineering disciplines.

### What categories of formulas are included in Mechanical Engineering Toolkit?

The toolkit covers Mechanics of Material, Theory of Elasticity, and Composite Material calculations. Specific formulas include moments of inertia, stress-strain relationships, beam deflections, and laminate properties.

### How do I use the Mechanical Engineering Toolkit for calculations?

Using the toolkit is straightforward. Simply choose the desired formula from the available categories and enter the required variables. The app will then provide the calculation result.

### Is the Mechanical Engineering Toolkit free to use?

Yes, the Mechanical Engineering Toolkit is available for free. However, it does contain advertisements.

### Does Mechanical Engineering Toolkit have ads?

Yes, the Mechanical Engineering Toolkit contains advertisements.

### What devices is Mechanical Engineering Toolkit compatible with?

The Mechanical Engineering Toolkit is compatible with iPhones, iPads, and iPods.

### How often is Mechanical Engineering Toolkit updated?

The app was last updated on September 24, 2024, indicating ongoing support and potential for future updates.

### What is the age rating for Mechanical Engineering Toolkit?

Mechanical Engineering Toolkit has an age rating of 4+, making it suitable for a wide range of users.

## Version history (last 5 releases)

### 1.12.0 — 2026-09-07

New in 1.12.0:

• Beam Load Analysis now covers six support arrangements — cantilever, overhang, propped and fixed-ended — with any number of point, distributed and moment loads.
• New Bolt Grades & Torque reference: ISO 898-1 and SAE J429, with clamp load and tightening torque.
• New Power Screw calculator: torque, efficiency and self-locking.
• Japanese and Chinese PDF reports no longer drop characters.

### 1.11.0 — 2026-08-28

New in 1.11.0:

• Every tool now explains itself — tap ? in the app bar for what it computes, the formula, and how to read the result. In all six languages.
• Tolerance stack-up: chain any number of dimensions, by worst-case and RSS.
• Standard pipe schedules (ASME B36.10M, NPS 1/8–24) fill Reynolds Number and Pipe Pressure Drop.
• Projects now hold several calculations and export as one PDF report.

### 1.10.0 — 2026-08-21

New in 1.10.0:

• Vibration — three new Machine Design tools: shaft critical speed, beam natural frequency across five end conditions, and torsional natural frequency for one or two rotors.
• Fill a beam's natural frequency straight from a standard section.
• Remove Ads now available on Android, with purchase restoration.
• Faster launch and fixes to purchase restore.

### 1.9.0 — 2026-08-14

New in 1.9.0:

• Fluids & Thermal — a new category: Reynolds number, pipe pressure drop, pump and fan power, wall conduction, fin efficiency and heat exchanger sizing.
• Standard Sections — AISC W, IPE and HEB shapes with full properties. Fill a beam straight from a section.
• Built-in fluid and thermal material property lists.
• Fixed PDF export in Chinese and Japanese.
• This update requires iOS 15 or later.

### 1.8.0 — 2026-08-09

New in 1.8.0:

• Projects — save a calculation's inputs under a name and reopen them any time.
• Export any result as a PDF report or a CSV file.
• One share button, with a choice of format: text, image, PDF, or CSV.
• Choose a light or dark appearance, or follow your device.
• More of the app is translated, and search now works in every language.
• Fixed a crash when naming a project.

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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 2026-09-09.*