Calcbot is an intelligent calculator and unit converter for the rest of us. Featuring an easy-to-read history tape, expression view, intuitive conversion, and much more!

History Tape*.
Every calculation you enter gets saved to the history tape. Refer to calculations later or send them right back to your current calculation.

Expression View.
Calcbot's original expression view allows you to see everything you have typed so you'll never forget what you entered or miss a typo.

Apple Watch Extension.
Perform basic calculations, conversions, calculate tips, and split bills right from your Apple Watch.

Convert any of your calculations with over 500 units across 22 different categories including auto-updating currency rates.

Fave a calculation and get instant access to its result via the Favorites Key. No more cryptic memory keys.

Scientific Functions.
Rotate your device into landscape mode to gain access to common scientific functions.

Get instant access to scientific constants like Pi, Atomic Mass, or add your own*.

Round for Currency.
Have all of your results rounded to two decimal places.

iCloud Sync.
Sync your history tape, constants, and faves across all of your Macs, iPhones, and iPads.

Sounds & Animations.
Beautiful custom animations and sound effects provide positive feedback and an enjoyable experience while performing calculations.

* In-App purchase required.

What’s New

Version 2.4.2

Updated Localizations

---- 2.4.1 -----
- Added watch complication
- Added ability to use negative numbers in watch converter
- Sped up adding to tape when there's a lot of items

---- 2.4 -----
Calcbot now features a completely new Apple Watch app that’s faster, more intuitive, and features full unit conversion support. We’ve also redesigned the conversion category icons, added a new theme, and included the option to change the color of the app icon. Now is the time to go pro and love your calculator!

Ratings and Reviews

4.6 out of 5
507 Ratings
507 Ratings
Cheekypoppet ,

Don’t buy the pro upgrade for conversions on Apple Watch

I paid for the upgrade so I could get full conversions, and customise conversions on the Apple Watch, but it won’t let me change the Watch conversions in iPhone settings. I change them, but it just stays as the default when I go back to the main screen of options. I have tried uninstalling and reinstalling on the iPhone and Apple Watch - no joy. Won’t let me change the default options.

Would be 5 star if that worked, but would give it no stars if I could without that working given that’s a key reason for paying for the IAP. Can’t even see a way to contact the developers to raise a query. Useless.....and very annoyed they have my cash as I rarely actually pay for apps.

rogntujuu ,

Frustrating interface spoils a good idea

So to convert an amount from one unit to another, you have to tap the amount into the calculator, swipe across using a very unintuitive swipe action that only works if you start your finger at the VERY edge of the screen, and the select your units.
Then if you want to alter the figure you are converting, you have to swipe BACK to the calculator using the difficult swipe action, DELETE the figure and enter another one, then swipe BACK.
I’m afraid I hate having to use this converter. It looks nice but the interface is seriously flawed an clunky. If you’re looking for a good unit converter, go elsewhere.

Billy T22 ,

Not feeling the love for Calcbot

Convertbot was the most favoured app for unit conversion amongst the various ones I have. Calcbot does not, in my opinion, provide a good user experience. It has a competent calculator but if I want to conver, I swipe the screen. If I want to modify the values then I have to swipe back to the calculator, enter the values and swipe back again. Why can’t I just convert the values I want to in either part. I would continue to convertbot but it is not compatible with ios11.


16 MB
Requires iOS 11.0 or later. Compatible with iPhone, iPad and iPod touch.
English, Arabic, German, Japanese, Russian, Simplified Chinese
Age Rating
Rated 4+
© 2018 Tapbots LLC
In-App Purchases
  1. Calcbot Pro £1.99
  2. Theme Pack 2 £0.99
  3. Theme Pack 1 £0.99


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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