# Units Converter & Calculator — 200+ Units, Physics Constants

> Unit converter and physical constants reference with learning and tracking features. (iPhone/iPad app by Alok Singh.)

- Source: https://appshunter.io/ios/app/units-converter-and-calculator/id1515811220 (this page in markdown: same URL + `.md`)
- Developer: [Alok Singh](https://appshunter.io/developer/1508795536)
- Category: Productivity, Education
- Price: Free with in-app purchases
- Rating: 4.70/5 from 32 App Store ratings · 10 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.0 · 172 MB
- Languages: British English, Afrikaans, Albanian, Amharic, Arabic, Armenian, Azerbaijani, Basque, Bangla, Bosnian and 89 more
- Released: 2020-05-30
- Data updated: 2026-08-20
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/units-converter-and-calculator/id1515811220/reviews.md

## What is Units Converter & Calculator?

The Ultimate Unit Converter, Physics Constants & Learning App

Convert 200+ units across 30+ categories instantly — completely offline and ad-free. Master physics with 180+ constants, interactive learning modes, and challenge games. Perfect for students, engineers, scientists, and professionals.

KEY FEATURES:

COMPREHENSIVE CONVERSIONS
• 30+ conversion categories including Weight, Temperature, Distance, Speed, Volume, Energy, Pressure, and more
• 200+ units across all categories
• Real-time conversions with instant results

PHYSICAL CONSTANTS LIBRARY
• 180+ physical constants with detailed explanations
• Search functionality to quickly find any constant
• Each constant includes:
  - What it is: Clear explanation
  - Why it's important: Significance in physics
  - How it's used: Practical applications
  - Interesting facts: Fascinating insights
• Covers fundamental constants, particle physics, thermodynamics, astronomy, and more

LEARNING MODES
• Quick Convert: Instant results for fast conversions
• Learn Mode: Guided discovery with progressive hints
• Challenge Mode: Test your estimation skills
• Track your progress across all categories

PROGRESS TRACKING
• Monitor your learning progress
• View hint usage statistics
• Track challenge scores
• See completion across all 30 categories

PREMIUM DESIGN
• Beautiful, modern interface
• Smooth animations and transitions
• Intuitive navigation
• Professional look and feel

CONVERSION HISTORY
• Automatic saving of all conversions
• Easy access to past calculations
• Organized by category
• Clean, readable format

SMART FEATURES
• Auto-save conversions
• Keyboard-friendly interface
• Search and filter constants
• Real-world reference examples

Perfect for:
• Students learning physics and chemistry
• Engineers and scientists
• Professionals needing quick conversions
• Anyone working with units and constants

Download now and experience the most comprehensive unit converter with an extensive physical constants reference!

## Key features

- 30+ conversion categories
- 200+ units
- 180+ physical constants
- Learning and challenge modes
- Progress tracking
- Conversion history

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Premium | $0.99 | one-time |


## Recent user reviews (10 of 10)

All indexed reviews: https://appshunter.io/ios/app/units-converter-and-calculator/id1515811220/reviews.md

### 1/5 — Difficile a utilisé

*2025-08-03*

On dois cherché comment faire fonctionné pas intuitif

### 5/5 — Excellent tool

*2024-06-13*

I use this all the time. Very handy that it is all layed out in different measurements all on one page

### 5/5 — App Fantastic!

*2024-04-25*

Very useful app, I am used to European measurement units and use it every day

### 1/5 — Free App is stupid unusable!

*2024-03-09*

If you are thinking you can use the free app version … forget it. You will get spammed with ads every 0.5 seconds! You don’t even have a chance to convert 1 thing for free! 
Such spamming of ads should be illegal. 

Like Apple say. The App Store a safe place to download apps. Apple don’t care about the quality of apps in the Apple App Store.

### 1/5 — versatilità

*2023-02-01*

dovevo convertire dei piedi in centimetri ma non ho trovato come fare

### 2/5 — Lacking a Lot

*2021-10-27*

Beautiful interface but very limited units. No volume, no millimeter option in distance, etc.

### 1/5 — needs more units

*2021-09-25*

Downloaded this app to use for volume conversions.  Can't use it since volume is not offered.  Will delete.

### 1/5 — too few units

*2021-09-16*

very limited conversions

### 5/5 — Nice

*2020-10-06*

Quick and Easy for childrens

### 1/5 — Inaccurate

*2020-06-17*

I entered 30cm to convert to inches - the answer was 1.1811 inches - clearly incorrect

**Developer response:** Hello Dr Chow

Thanks for reporting an important issue , 
We verified and fixed that issue and Please update to latest version.

## Frequently asked questions about Units Converter & Calculator

### What is Converter : Units?

Converter : Units is a comprehensive tool for converting between over 200 units across 30+ categories and provides a library of over 180 physical constants with detailed explanations.

### What devices does Converter : Units support?

Converter : Units is available on Mac, iPhone, iPad, and iPod.

### How often is Converter : Units updated?

The app was last updated on February 2, 2026, indicating a recent update. The latest version is 2026.02.03.

### What is the age rating for Converter : Units?

Converter : Units has an age rating of 4+, making it suitable for a wide range of users.

### Does Converter : Units have ads?

Yes, Converter : Units contains advertisements.

### Can I track my progress with Converter : Units?

Yes, Converter : Units offers progress tracking features, allowing you to monitor your learning progress, hint usage, challenge scores, and completion across all categories.

### What kind of learning modes are available in Converter : Units?

Converter : Units includes Quick Convert for instant results, Learn Mode for guided discovery with hints, and Challenge Mode to test your estimation skills.

### What are the in-app purchase options for Converter : Units?

While the app is free, it offers in-app purchases, though specific details on what these purchases entail are not provided in the description.

## Version history (last 5 releases)

### 2026.07.06 — 2026-07-08

Bug fixes and performance improvement

### 2026.02.03 — 2026-02-02

Bug fixes and performance improvement

### 2026.01.26 — 2026-01-25

Bug fixes and performance improvement

### 2026.01.20 — 2026-01-20

Major Update: Physical Constants Library & Enhanced Features

NEW FEATURES:
• 180+ Physical Constants with detailed explanations
• Search functionality for constants
• Detailed constant information screen (What, Why, How, Facts)
• Premium design system with modern UI
• Enhanced conversion history with better readability
• Improved cell spacing and layout

IMPROVEMENTS:
• Better keyboard handling
• Auto-save on keyboard dismiss
• Duplicate conversion prevention
• Enhanced visual design
• Performance optimizations

PHYSICAL CONSTANTS:
• Comprehensive library covering fundamental physics, particle physics, thermodynamics, astronomy, and more
• Each constant includes detailed explanations and interesting facts
• Search to quickly find any constant
• Tap any constant to learn more about it

DESIGN:
• Premium look and feel
• Smooth animations
• Better spacing and typography
• Enhanced user experience

Download now and explore the most comprehensive unit converter with an extensive physical constants reference!

### 2022.08.16 — 2022-08-19

Bug fixes, Performance improvements and some Optimisations to improve your experience more better.

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All apps by Alok Singh: https://appshunter.io/developer/1508795536

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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 2026-08-20.*