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A streamlined, powerful, user-friendly unit and currency converter designed for use by everyone and built by engineering professionals! No dials to turn, no gimmicky interfaces, no need to type your unit... just enter a value in the unit you have and see the conversion for the one you want as well as others all at once. All laid out in big, easy to read text with an intelligent, customizable display system.

There is also a versatile Currency converter included in the app!

The app also includes a powerful built-in Calculator and a spreadsheet-style Mass Fraction/Mole Fraction Converter. Also included are a very useful Thermocouple module and a database of physical constants.

Conversions aren't limited to just one pair of units. There are 40+ different types of units currently in the app. Set your preferred units or most frequently used units for quick access to the data most needed. Don't want to see all of the units in a given category? You can reorder and hide units based on your needs.

The app is designed to accept mathematical expressions as your input! For example, if you need to convert 1 3/8 inches to mm, just enter 1+3/8 in the inches cell... and you can do far more complex operations as well! Detailed math help is available under Settings+.

As another bonus, we have provided a control panel that can be used to tailor the colors of the app to the user's preferences. You'll find this feature under Settings+. While you're there, check out the links to our other apps and find us on social media!

Like us on Facebook: www.facebook.com/ChemEApp
Follow us on Twitter: @Vector254

What’s New

Version 3.0

This app has been updated by Apple to use the latest Apple signing certificate.

Unlocked the app special features for all users as a Christmas present.

Fixed a bug that would crash the app when entering units.

Disabled the currency converter until we find a new data stream.

Fixed an error in the conversion factor for g/L in density.

Ratings and Reviews

4.2 out of 5
55 Ratings

55 Ratings

Jon3ds ,

Excellent. Long ton error

Love this so far. Noticed a decimal error in long ton conversion.

El Bärthø ,

Best friend as an engineering student

This app is my best tool when it comes to engineering homework. Layout is straightforward and even better being customisable to your preferences. I've been using it for years now am recommending it to anyone who is tired of googling how to convert psi to dynes/cm^2

Capitalism and Freedom ,


This is a great free app that I constantly use. I use this app for working on my car doing volume conversions, torque conversions, and also for random daily use. This is a must have app for anyone who is a do it yourselfer.

App Privacy

The developer, Vector 254 LLC, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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