Count on Calculator HD: Simple and Prowerful, with big buttons for daily calculations. Start Calculating Now!
Calculator HD combines the Standard & Scientific calculator, with extensive & easy functionality options. Calculator HD is Fast, Accurate and Beautiful, it's everything you need right in the palm of your hand!

• Basic Calculation Buttons
• Mathematical / Scientific Buttons - hidden in iPhone portrait view
• Calculate with Degrees or Radians
• Percent Button
• Memory Button
• History View: Save, Copy & Forward
• Backspace Button - Slide/Swipe the Result Screen or use the Back Button
• Quick Equation View
• Split View
• Hand off support (continue calculation on other devices via spotlight or app manager)

Addition, Subtraction, Division, Multiplication, Percentages
Cubic Exponent, Cubic Root
Engineering Exponent
Nth Exponent, Nth Root
Power of E, Power of Ten, Power of Two
Square, Square Root
Natural Logarithm, Common Logarithm, Binary Logarithm
Sine, Cosine, Tan
Arc Sine, Arc Cosine, Arc Tan
Hyperbolic Sine, Hyperbolic Cosine, Hyperbolic Tan
Hyperbolic Arc Sine, Hyperbolic Arc Cosine, Hyperbolic Arc Tan
Multiplicative Inverse, Random Number Input, Factorial

As always, we appreciate your feedback.
Please email us at with any suggestions or questions.
If you are happy with this update, please let us know by rating and reviewing us in the App Store!

-- COUNT ON --

What's New

Version 3.2.9

• We’ve fixed some small bugs to improve the stability & performance of the app.

Ratings and Reviews

4.8 out of 5

3K Ratings

3K Ratings

Repeating Calculations


When doing the same operator with a fixed number you have to tap the enter key twice now. Example converting mm to inches you divide by 25.4 and press Enter. Then all you had to do is enter a mm number and press Enter. Now you have to tap the enter key twice. Now when you add a number to memory it does not clear the display like it used to. This is still my favorite calculator. Thank You, Don

Overall a decent calculator


I would add another star if various creative skins were available. Also another star (for a total of 5) if the tabulations showed on the tape as you do calculations instead of only after you hit the = key and instead of across the display above the numerical keys.

Yet another star if common conversions were available e.g. inches to cm, cc’s to quarts, km to miles, Fahrenheit to Celsius, etc.

Overall, though, a good calculator.

Developer Response

Thank you for reaching out to us with your feedback. We here at Impala Studios greatly value the opinion of our users. We will see what we can do with your feedback, and we will consider it for future updates.

In the meantime I hope you will still enjoy our app, and that we can continue to bring great experiences to you.



I have used this app as my calculator for many years on my iPad. I can see my transaction in history to verify entries. It is the right size to easily read. I would use no other.


Impala Studios B.V.
59.2 MB
Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.
English, Dutch, French, German, Greek, Italian, Japanese, Korean, Portuguese, Russian, Simplified Chinese, Spanish, Swedish, Traditional Chinese
Age Rating
Rated 4+
© Impala Studios


  • Family Sharing

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

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