9 Best Free Calculator Apps for Android

By | December 11, 2021

Our math teachers used to warn us that we wouldn’t have a calculator everywhere we went. But now we can have a smartphone wherever we go, with access to hundreds of calculator apps.

Since there are so many options, it can be difficult to determine the right one for your needs. Today we are going to break down the best free calculator apps for Android.

Calculator (by Google)

This is your simplest and safest bet. Google offers barebones, well-designed apps that will tackle basic math tasks, but not much else. It calculates in real time, so you don’t even have to reach for the equals button.

You can get some more complex functionality by swiping in from the right side, but this is still limited. The only other major feature is that you can tap the top of the screen to open a three-dot menu where you can convert decimals to fractions and that’s about it. No history or graphics.

It is completely free and has no ads. So it gets the job done (unless you’re trying to live Google-free).

Download: Calculator by Google (Free)

Calculator ++

If Google Calculator is a little too basic for you, try Calculator++. This app has Simple and Engineer mode. It supports a variety of functions, history of everything you calculate, and can even create graphs.

One neat little feature is the swipeable buttons. Swipe up on the switch to activate the options at the top, and swipe down to activate the options at the bottom. It’s also customizable, with several different theme options available. Along with the widgets for your home screen, it includes a floating window mode.

This application does contain ads, but they are only displayed on side pages such as History, not the main calculation page. You can remove it for $4. Overall, it strikes a nice balance between simple and functional.

Download: Calculator ++ (Free)


ClevCalc is actually a bunch of calculators at once. Not only does it have the basics like currency and units converters, but it also has everything from a fuel cost calculator to an ovulation calculator.

You can choose from several different themes all inspired by Material Design. Although the app has ads, you can remove them via in-app purchases.

Download: ClevCalc (Free)

Calculator (by TricolourCat)

Here’s a simple option named Calculator. This one is best for people who are very particular about their keyboard, as it has three different layout styles: Standard, Stylish, and Ergonomic.

It also has lots of different color options and the option to add or remove memory keys. Additionally, you can change how decimals appear (1.5 or 1.5) and view your history by swiping down from the top. It’s very simple, but also more customizable than most basic calculator apps.

The app does have banner ads at the bottom, but you can buy the Pro version to remove them.

Download: Calculator (Free)
Download: Calculator Pro ($1.50)

CalcTastic Scientific Calculator

This app is for anyone who needs more scientific calculation options. It has a basic calculator too, but the emphasis is on the scientific part. You can work on complex problems to your heart’s content, but it can’t graph anything.

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It’s also well customizable, with some classic scientific calculator themes and regular glow themes. If you upgrade to the Pro version for $1, you get seven more themes, polar complex numbers, landscape support, and a programmer’s calculator.

Download: Scientific Calculator (Free)
Download: Scientific Calculator Pro ($1)

RealCalc Scientific Calculator

Another good scientific calculator is the popular RealCalc. It’s designed to look like the traditional handheld scientific calculator you use at school.

RealCalc has all the standard scientific functions you need. It also supports history, memory, unit conversion, and constants. Binary, octal, and hexadecimal calculations work well too.

The app offers two types of calculators, traditional and Reverse Polish Notation (RPN). When using the traditional type, make sure you put brackets around the part of the equation to maintain the order of the calculations. This is different from the other calculators listed above — you can’t type an equation as it appears.

You can also choose from a number of display styles and formats to customize the appearance of the application.

The free version offers a lot of useful features that might be enough for your needs. If you want more features, like fractions, degrees/minutes/seconds, customizable conversions and constants, landscape mode, and a 12-digit display, you can buy RealCalc Plus.

Download: RealCalc (Free)
Download: RealCalc Plus ($3.49)


The app ends up carrying a rather original name (even if it’s just a shortened version of “calculator”). CALCU has a basic and scientific layout, lots of slick themes, and even the option to customize the fonts.

It has quick little swiping animations, like swiping down to reveal history or swiping up to reveal more scientific buttons. There is a banner ad at the top which you can remove via a $2 in-app purchase.

Download: CALCU (Free)

One Calculator

One Calculator has a sleek aesthetic, including smooth transitions and animations with a nice color scheme. It also has a matrix calculator, converter, and grapher.

Unfortunately, the other themes cost $1.49 each, but that’s the price to pay for an ad-free calculator that covers all the bases: basic, scientific, and graphics. It’s so intuitive and fluid that you’ll love it right away.

Download: One Calculator (Not Available Anymore)

Desmos Graphing Calculator

For those who want a dedicated graphing calculator app, Desmos Graphing Calculator is for you. There’s not even a basic calculator interface here it’s all about graphing. This app makes it easy for you to program and plot many functions, then use the sliders to customize them. You can even start with some sample app graphics for help.

If you want, you can create an account to log in and sync your charts. Best of all, no ads and no in-app purchases.

Download: Desmos Graphing Calculator (Free)

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