CalculationBook Pro is an incredibly easy-to-use calculator.
Mathematical formulas are displayed, so you don't have to worry about making a mistake when entering numbers.

Equipped with original features, including a history for easy editing and recalculation, a totalization bar, formula references, and sheet management function, it's simple to use. CalculationBook can be used easily without any fuss, just like a regular calculator.

◆Go back and check past calculations
・Scroll through the list of calculations to hide the keyboard.
・Correct past calculations and recalculate.
・Swipe past calculations to copy or delete them.

◆Refer to calculation results
・To refer to other calculation results while calculating, tap the solution section of the calculation which you wish to refer.
・When you correct a formula, calculations referring to it will also be linked and updated.
・Formulas can be given names. When you name formulas that are referred to, it becomes easy to understand connections with references.

◆Use parentheses and a variety of functions
・To use the scientific calculator function, change the keyboard by tapping the second button from the left on the keyboard's top row.
・You can also change to it by swiping left on the keyboard.

◆Summarize bar
・Convenient for summing up many items, such as shopping receipt amounts.
・Summarize total, total (tax included), average, maximum, minimum, number of items, variance, standard deviation, unbiased variance and unbiased standard deviation.
・Show or hide the summarize bar by tapping the third button from the left on the top row of the keyboard.

◆Function buttons
・Freely assign frequently-used buttons to be the three function buttons.
・When you swipe down on the keyboard, the three function buttons appear.
・√, % and TAX are initially assigned, but you can freely assign functions by going to Settings>Details.
・When function buttons are displayed, a parentheses button will appear at the top right.

◆Sheet manager function
・Start calculating on a new sheet with your calculation history left as-is.
・Create multiple sheets depending on your intended use.

◆Try the free version.
・The free version includes advertisements.
・It does not include the sheet manager function.

◆ Disclaimer
Although we are making every effort to ensure the accuracy of the calculation results done by this App, we do not guarantee its accuracy.
Please understand that we are not liable for any damage, loss, disadvantage, etc. caused in using this App.

What’s New

Version 1.17

-Supported iOS 13 dark mode.
-Changed the default tax rate to 10%.

Ratings and Reviews

4.4 out of 5
19 Ratings

19 Ratings

EJ_Rhodes ,

Simple interface with a tape

I am baffled why more calculators are not this simple. The interface is clean and the tape is much appreciated. Worth the price.

Mac100 ,

Great app!

App is great! Widget is awesome! Easy to use. Good features. Quick. Really like how easy it is to change things. Great job on this app!

duttychai ,

decent basic unique, can save out calculations to other apps

only concern is no developer activity since 2014 October when I first installed.


11 MB

Requires iOS 11.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, Japanese

Age Rating


  • Family Sharing

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

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