This is THE BEST calculator for iPhone, iPad and iPod touch!

・Dual-line display - shows the input and result at the same time
・History tape - saves every calculation, time and date stamped
・Memory buttons - shows its value on the display
・Percentage and backspace button
・Scientific functions
・6 layouts (3 portrait, 3 landscape)
・9 color themes
・Multi-line input for really long equations
・Automatic scientific formatting
・Label any calculation in the history tape
・E-mail a calculation or the entire history tape
・VoiceOver accessibility
・iOS 9 Split View
・3D Touch


・Swipe down to see the history tape
・Swipe left or right on the keypad to switch between basic and scientific keys
・Swipe left on the display to backspace
・Swipe right on the display to clear
・Tap & hold on the result to copy
・Tap & hold on the input to move the cursor, copy, paste, convert to E-notation


・Color Theme
・Light Tape Background
・Show Layout Button
・Allowable Layouts
・Show Memory Buttons
・Replace ÷ Button With /
・Replace E Button With 00
・Show Thousands Separators
・Minimum Decimal Digits
・Maximum Decimal Digits
・Font Size
・Equals Repeat
・Left-Handed Mode

URL Scheme: calculatorhdpro://

What's New

Version 3.6

- Added Copy Calculation To Clipboard to History Tape.
- The +/- button now works with Scientific E Notation (1E3 +/- is now 1E-3 instead of -1E3).
- Fixes issue with the input not working correctly if Persian is selected as your keyboard language.
- Increased maximum font size to 140%.
- Improved scaling of button labels at larger sizes.

Ratings and Reviews

4.7 out of 5

2.7K Ratings

2.7K Ratings

Nearly Perfect!


Tried many calculators (free & paid). HD Pro surpasses the others by far! The most important thing is, it's incredibly User-friendly. My list of Likes keeps growing yet, my Wish list only has tweaks to 'customize' the Tape.
1. Ergonomic - Easy to access & read. The keys are large enough for clumsy fingers. The screen displays numbers clearly.
2. Can use in Portrait or Landscape modes.
3. History: Retains Tape w/ALL previous calculations. Typically, apps limit history to a certain size.
4. Can use data from tape (the result or as actual input) in current calculations .
Wish List/Customize Tape:
1. Add 'Label/Notation' for each item. This would help user ID calculations among many similar ones or highlight important ones.
2. Editing: Let user Add/Change labels on historical calculations.
3. Deleting: Allow selection of individual Tape items for Deletion (as alternative to 'deleting all').

Currently, one must retain the entire tape if historical results are valuable enough to hang on to. Without the relevant historical data, I'd be recalculating same data a lot & wasting time!

Simple and Sweet!!


This is just what I was looking for... 👍
It has percentage % which comes in handy with sales tax! It even has both Basic and a Scientific calculators, and it is Beautiful too! The $ cost is worth having no commercials! And it has the option to have a paper trail. Gives you each item and the total that you can print out! And a correction key to go back and make corrections without starting over! Truly wonderful!
Thank you!
PS. Personally, it would be better to have the "Plus/+" sign be the BIGGEST BUTTON instead of the = button that I use much much less!
Just a thought...

Best Calculator on the Market

The Low Bass

This calculate is well designed. It makes doing everything for the simplest to the most complex calculations clear and effective. The running total and list of items in addition and subtraction alone make it worthwhile. I can check for typos during a calculation and easily revise for correct results. I use this instead of any other calculator apps out there. I replaced my Apple calculator on my main page. Get this one!


Cider Software LLC
13.7 MB
Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.
English, Dutch, French, German, Italian, Japanese, Portuguese, Russian, Simplified Chinese, Spanish
Age Rating
Rated 4+
© 2012-2018 Cider Software LLC


  • Family Sharing

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

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