OpenCalc - Calculator

4.2
820 reviews
100K+
Downloads
Content rating
Everyone
Screenshot image
Screenshot image
Screenshot image
Screenshot image

About this app

This modern and beautiful scientific calculator will help you solve all your calculations. It is simple, effective and contains no advertising. It has different themes to suit your phone perfectly.

The app allows you to do simple and quick calculations with many basic functions, including multiplication, division, root, powers, factorials and even trigonometry functions. OpenCalc is customizable to meet all your needs.

Contains no unnecessary ads or permissions. It is fully open source.
Updated on
Sep 21, 2025

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
No data collected
Learn more about how developers declare collection

Ratings and reviews

4.2
795 reviews
Abigail Harger
September 19, 2024
This is basically the same as the built in calculator, except it takes up less space. The only problem is that when I open the scientific calculator section, the symbols don't shrink, so everything looks cramped and partially cut off. It's still better for small screens than other FOSS calculators I tried (which didn't work at all because of the screen size) and I can still read the symbols.
20 people found this review helpful
Did you find this helpful?
Matthew Hanna
September 9, 2025
So bad. I'm going back to either Google's or Samsung's calculator. Old: I had a long formula. I needed to delete 2 digits. I tapped the back / delete button twice and the whole equation vanished. It should NOT work that way. It still happens without a long press. So messed up. Old: Decimal points are not accepted in this app in certain situations though needed.
4 people found this review helpful
Did you find this helpful?
Darkempire
April 17, 2025
Hello Matthew, Tap twice do not delete the whole formula bit only 2 digits. Only long click will delete the whole formula
Harry Dick
June 4, 2023
Whoa! An calculator without spying and constantly updated privacy terms! 😆 And it can calculate too! I hope it also is without constant updates and updated privacy violations too as math is quite stable. Think about the density of the dystopia we are living in, you dont natively have a unspying calculator (or keyboard or etc..) on your superphone and at the same time such option is made hard to find with dark patterns on app store.
74 people found this review helpful
Did you find this helpful?

What’s new

Fix history deletion