# Unit Conversion - Converter and Calculator

> Unit converter and calculator with 16 categories and programmable buttons. (iPhone/iPad app by Fapps World et Cie S.E.C.S..)

- Source: https://appshunter.io/ios/app/unit-conversion-converter-and-calculator/id336359986 (this page in markdown: same URL + `.md`)
- Developer: [Fapps World et Cie S.E.C.S.](https://appshunter.io/developer/881437066)
- Category: Utilities, Productivity
- Price: $0.99
- Rating: 4.60/5 from 102 App Store ratings · 110 written reviews indexed
- Age rating: 4+
- Requires: iOS 6.0 · 3 MB
- Languages: Russian, Vietnamese, American English, Arabic, Hungarian, Dutch, Greek, Danish, Hebrew, Indonesian and 21 more
- Released: 2009-10-30
- Data updated: 2026-09-03
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/unit-conversion-converter-and-calculator/id336359986/reviews.md

## What is Unit Conversion?

This application offers quick and easy conversion of units. 16 different unit categories are supported, like temparature, currency, distance, weight, volume, ...
In addition the app offers a calculator. You don't have to switch any more between conversion and calculation apps.
There are even two calculators included, a standard and a scientific one.
Units are sorted by frequency of usage, the units used most often show up on top of the list. No need to scroll anymore to find your favorite units.
Programmable buttons make it possible to access your favorite conversion units even faster.
All functionalities are accessible on the main screen, no need for tedious switching between sub-screens.

List of supported unit categories:
- currency (live update)
- temperature
- distance
- weight
- volume
- time
- surface
- speed
- angle
- data storage
- energy
- power
- pressure
- concentration
- radioactivity
- typography

Features:
- simple and intuitive user interface
- 2 calculators: standard and scientific
- units are sorted by the frequency by which you are using them. The units you are using most are shown on top. This allows much faster working.
- live update of currency conversion rates
- programmable buttons: save your favorite unit conversions on these buttons for faster working.
- swap key, for fast swap of the 2 selected units
- all settings are saved when leaving the application

Instructions:
The programmable buttons are the blue buttons at the top. Hold one down until you hear the beep and the selected units will be saved on this button. Press the button again for fast recall of this unit pair.
If the app emits a beep while working it means you have made an invalid operation, like for example the square root of a negative number.

Please note:
For currency conversion rates are downloaded from an internet server. Without a working internet connection the currency category will not show up.

If you have any problems contact us at support@fappsworld.com

## Key features

- 16 unit categories
- Standard and scientific calculators
- Units sorted by frequency of use
- Programmable buttons for favorites
- Live currency conversion rates
- Intuitive user interface

## Recent user reviews (10 of 110)

All indexed reviews: https://appshunter.io/ios/app/unit-conversion-converter-and-calculator/id336359986/reviews.md

### 3/5 — Decent But Recently Problematic

*2026-01-29*

I have used this app for years on IOS with no issues. But recently it has started crashing to my desktop and won’t allow me to use it unless I remove it from my phone and reinstall the app. Which is why I can’t give it more than a 3 star rating and have to find another app.

### 5/5 — Évite de nombreuses recherches Google

*2022-12-21*

Sur un précédent smartphone j’avais la même appli sans la conversion des devises qui a été maintenant ajoutée. Pour mon utilisation c’est parfait 👌

### 5/5 — Very simple

*2022-09-21*

The most reliable go to unit converter ever! Love it!

### 2/5 — Originally great

*2022-02-24*

Was a great app but now, adverts aside, is inaccurate. 148cm is not 4’ 8.55.”, it’s 4’10.27”Almost 2” out 🤷🏼‍♂️

### 5/5 — Really helpful

*2022-02-21*

This app is probably the one app I have used the longest. I have used it in so many situations. I use it in my personal life and on the job.

### 5/5 — So useful

*2021-05-18*

Well, it’s definitely a must have. Ideal for folks that work with US and Imperial and KG measures. Easy to use and fun.

### 5/5 — Love it

*2021-04-27*

Very intuitive and easy to use.

### 5/5 — Stenne2012

*2021-03-28*

Util

### 4/5 — Missing a couple things but still nice!

*2021-01-22*

Wish it had watts to lumens for each of the lightbulb types and other electricity related conversions abilities. Worth the $1.39! Very private. Not even anything to turn off in my settings. It’s literally just a units converter that pops up on your screen. There isn't even any settings options in the app.

### 5/5 — We need an update to the new IOS, please!

*2020-12-31*

We need an update to the new IOS please

## Frequently asked questions about Unit Conversion

### What does this unit conversion app do?

This application provides a comprehensive tool for converting units across 16 different categories, including temperature, currency, distance, and weight. It also integrates both standard and scientific calculators, allowing users to perform calculations without switching to separate apps.

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

Key features include a simple and intuitive interface, two built-in calculators (standard and scientific), units sorted by usage frequency for faster access, live currency conversion rates, and programmable buttons to save favorite unit conversions for quick recall.

### Is this app free to use?

Yes, the application is free to use. It does not feature in-app purchases or advertisements, offering a completely free experience for all its functionalities.

### How do I use the programmable buttons?

The programmable buttons, located at the top of the screen, allow you to save your most frequently used unit conversions. To save a conversion, hold down a programmable button until you hear a beep, and the selected units will be stored. Pressing the button again will quickly recall that specific unit pair.

### What are the supported unit categories?

The app supports a wide range of unit categories, including currency (with live updates), temperature, distance, weight, volume, time, surface, speed, angle, data storage, energy, power, pressure, concentration, radioactivity, and typography.

## Version history (last 5 releases)

### 1.9 — 2015-09-16

This update from Apple will improve the functionality of this app. No new features are included.

supporting iOS 9

### 1.8 — 2014-11-19

bug fix for the shift key

### 1.7 — 2014-07-17

support of 4 inch display

### 1.6 — 2011-03-03

fixed the problem due to which the currency category did sometimes not appear

### 1.5 — 2011-01-15

-bugfix

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## More apps by Fapps World et Cie S.E.C.S.

- [Arukone](https://appshunter.io/ios/app/arukone/id350576666)
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All apps by Fapps World et Cie S.E.C.S.: https://appshunter.io/developer/881437066

## Related topics

[units convertion](https://appshunter.io/ios/topics/units-convertion) · [unit conversion app](https://appshunter.io/ios/topics/unit-conversion-app) · [diy units conversion](https://appshunter.io/ios/topics/diy-units-conversion) · [silverson conversion tools](https://appshunter.io/ios/topics/silverson-conversion-tools)

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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 2026-09-03.*