One of the most popular alternatives to Windows Calculator is SpeedCrunch, which is free and open source. Other popular alternatives are Qalculate!, OpenCalc, Calculator You and GeoGebra Scientific Calculator. Calculators like Windows Calculator are a crowded field, with more than 100 alternatives for Windows, Android, Mac, iPhone and the web.
Totucalculator is a free, online-based calculator website that strives to improve people's efficiency by developing impactful calculators of all kinds. Currently, there are over 250 free calculators that you can use today.
A powerful tape-style calculator with editable history, instant recalculations, and smart note-taking – designed for professionals and everyday use.
RJ Calculator is a scientific calculator with most basic functions like trigonometric functions, logarithms and base conversion. Also, statistic calculations like standard deviation and regression.
Simple yet very effective calculator with print capabilities and log registration.
Canada
A kickass, open-source calculator that lets you do calculations and unit conversions naturally, with features like:
RunMath is a lightweight, keyboard-focused calculator for Windows, designed for fast and efficient mathematical operations. It supports basic and advanced calculations, unit conversions, and complex numbers, with features like calculation history, customizable themes, and...
Calculator Plus is a nice addition to hundreds of Calculator apps but with unique idea and innovative and user friendly designed buttons.
Moffsoft FreeCalc is the ideal replacement for your standard Windows calculator - with adjustable size, visible memory value and digit groupings, this free calculator software is a simple and intuitive tool.
United States
A calculator with syntax highlighting that supports user-defined variables and functions, math-like syntax, and some more advanced operations such as derivation and integration (estimate), and complex numbers.
Calculator-inator is a Calculator & Converter for Android inspired from Google Calculator
Android UI of the almighty Qalculate! calculator. It is simple to use but provides power and versatility normally reserved for complicated math packages, as well as useful tools for everyday needs (such as currency conversion and percent calculation).
Germany
EU
