# EZ Engineering Calculator — Scientific, units, no ads

> Scientific, units, no ads (iPhone/iPad app by CHING FENG WANG.)

- Source: https://appshunter.io/ios/app/ez-engineering-calculator/id470931826 (this page in markdown: same URL + `.md`)
- Developer: [CHING FENG WANG](https://appshunter.io/developer/394371304)
- Category: Utilities, Finance
- Price: $4.99
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English, Arabic, Dutch, French (France), German (Germany), Hindi, Indonesian, Italian, Japanese, Korean and 10 more
- Released: 2011-10-13
- Data updated: 2026-09-10
- User reviews in markdown: https://appshunter.io/ios/app/ez-engineering-calculator/id470931826/reviews.md

## What is EZ Engineering Calculator?

A serious engineering calculator that opens ready to use, with nothing interrupting you.

ENGINEERING MODE
Five keypad pages, from everyday arithmetic to graduate maths:

• Functions: x^y, square and cube roots, nth root, |x|, n!, e^x, ln, log, log2, mod, floor, ceil
• Trigonometry: sin/cos/tan, inverse, hyperbolic and inverse hyperbolic, degrees or radians
• Discrete: permutations nPr, combinations nCr, GCD, LCM, AND/OR/XOR/NOT, bit shifts
• Analysis: series, products, derivative d/dx, definite integral, mean, median, standard deviation, variance
• Constants: pi, tau, e, phi, plus 15 physical constants including the speed of light, the gravitational constant, Planck's constant and Avogadro's number

Derivatives use central differences and integrals use adaptive Simpson quadrature, not lookup approximations. Bitwise work shows hexadecimal, octal and binary side by side, with two's complement for negative numbers. Memory keys M+, M-, MR, MC and cursor keys let you go back and edit a long expression instead of retyping it.

Expressions honour parentheses and operator precedence, and the result previews as you type, so you rarely need the equals key.

UNIT CONVERSION
224 units across 15 categories: length, weight, volume, area, speed, time, temperature, pressure, power, energy, data, density, angle, force and electricity. Temperature uses the correct formulas rather than a scaled ratio.

CURRENCY CONVERSION
166 currencies, updated daily. See one amount in several currencies at once, and type an expression straight into the amount field. Rates are stored on the device, so it keeps working offline.

WHAT THE PAID VERSION GIVES YOU
• No advertising of any kind, and no in-app purchases
• Opens directly into the calculator, in engineering mode

ALSO
• 20 languages, with number formatting that follows your region
• Dark mode
• No account, no sign-in

Privacy: no personal data is collected, and what you type never leaves your device.


## Version history (last 5 releases)

### 4.0 — 2026-09-09

This release is a complete rewrite.

Engineering calculator
• A new calculation engine with over 60 functions, including derivatives, definite integrals, series, permutations and combinations, and bitwise operations
• Hexadecimal, octal and binary shown together, with two's complement for negative numbers
• Results preview as you type, so you rarely need the equals key
• Cursor keys for editing long expressions
• Fixed results being truncated to 6 decimal places

Unit conversion
• 224 units across 15 categories
• Fixed incorrect conversion factors carried over from the old version

Currency conversion
• 166 currencies, updated daily
• Tap a currency on screen to make it the one you type in
• Small amounts keep their precision instead of rounding away

Also
• Redesigned throughout, with dark mode
• 20 languages, up from 3

### 3.2 — 2020-02-24

What's New:
1. Fixed calculator's layout issue
2. Fixed updating currency rate issue

### 3.1 — 2018-10-09

更新內容：
1. 修正算式太長時，無法完整顯示和無法顯示計算結果的問題

### 3.0 — 2018-06-19

更新說明：
我們在這次的更版中做了比較大幅度的改版，我們希望回到這個 app 的設計初衷，就是簡單、好用！所以我們這次移除了許多原本的小功能，也特別加強匯率的更新功能，新版的設計可以在不到 0.5 秒內更新所有的匯率。單位的換算也更新了使用介面的操作，可以提供更方便、快速的計算。

更新項目：
1. 移除使用者較少使用的功能（匯率、單位換算的歷史紀錄、台灣匯率表...等等）
2. 改善匯率更新的速度與效率
3. 改善單位換算的操作介面
4. 使用者介面更新與不同設備的相容性（支援 iPhone X)

### 2.7 — 2017-10-29

更新內容
修正匯率無法更新問題

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## More apps by CHING FENG WANG

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All apps by CHING FENG WANG: https://appshunter.io/developer/394371304

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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 2026-09-10.*