The 9 Best Free Calculator Apps for Android

Lori Kaufman Updated 22-08-2018

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


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

1. Calculator (by Google)

This is your simplest, safest bet. Google offers a barebones, yet well-designed app that will handle 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 functions by swiping in from the right side, but it’s still a rather limited set. The only other major feature is that you can tap on the top of the screen to reveal a three-dot menu that allows you to change decimals to fractions—and that’s about it. There’s no history or graphing.

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


Download: Calculator by Google (Free)

2. Calculator ++

If the Google Calculator is a little too basic for you, try Calculator ++. This app has both a Simple and an Engineer mode. It supports a wide variety of functions, a history of everything you’ve calculated, and it can even create graphs.

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


This app does contain ads, but they only display on side pages like History, not the main calculation page,. You can remove them for $4. Overall, it strikes a nice balance between simple and functional.

Download: Calculator ++ (Free)

3. ClevCalc

ClevCalc is actually a bunch of calculators all in one. Not only does it have the basics like a currency and unit converter, 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. Though the app does have ads, you can remove them via an in-app purchase.

Download: ClevCalc (Free)

4. Calculator (by TricolorCat)

Here’s a choice simply named Calculator. This one is best for folks who are super particular about their keyboard The 5 Best GIF Keyboards for Texting and Emojis on Android What's the best GIF keyboard for Android? These keyboards make it easy to add GIFs and emojis to anything you type. Read More , because it has three different layout styles: Standard, Stylish, and Ergonomic.


It also features a ton of different color options and the option to add or remove the memory buttons. Other than that, you can change how decimals appear (1.5 or 1,5) and view your history by swiping down from the top. It’s super simple, but also more customizable than most basic calculator apps.

The app does have a banner ad along the bottom, but you can buy the Pro version to remove it.

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

5. 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 portion. You can work on complex problems to your heart’s content, but it can’t graph anything.

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

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

6. RealCalc Scientific Calculator

Another good scientific calculator is the popular RealCalc. It’s designed to look like the traditional hand-held scientific calculators you used in school.

RealCalc has all the standard scientific function you’ll need. It also supports history, memories, unit conversions, and constants. Binary, octal, and hexadecimal calculations work just fine too.

The app offers two calculator types, traditional and Reverse Polish Notation (RPN). When using the traditional type, make sure you put parentheses around parts of the equation to preserve calculation order. It’s different than the other calculators listed above—you can’t just type in the equation as it appears.

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

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

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


This app finally brings a somewhat original name (even if it is just a shortened version of “calculator”). CALCU has both basic and scientific layouts, a bunch of slick themes, and even an option for adjusting the font.

It has swift little swiping animations, like swiping down to reveal the history or swiping up to reveal more scientific buttons. There’s a banner ad along the top that you can remove via a $2 in-app purchase.

Download: CALCU (Free)

8. One Calculator

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

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

Download: One Calculator (Free, in-app purchases available)

9. 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 the graphs. The app makes it easy to program in and plot multiple functions, then use sliders to adjust them. You can even start with some of the app’s example graphs for some help.

If you want, you can make an account to sign in and sync your graphs. Best of all, there are no ads and no in-app purchases.

Download: Desmos Graphing Calculator (Free)

Which Is the Best Calculator for Android?

Each of these apps has its strengths and weaknesses, so it’s worth trying out a few before settling on which works the best for you. If you also use an iOS device, we’ve covered the top calculator apps for iPhone, iPad, and Apple Watch.

Now that you’ve replaced the stock calculator app, why not check out some other great alternative Android apps 8 Stock Android Apps You Should Replace With These Alternatives Unhappy with the stock apps that come with stock Android? Here are excellent replacements for Messages, Phone, Gmail, Camera, and more. Read More ?

Related topics: Android Apps, Calculator, Math.

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  1. Deepanshu Arora
    June 16, 2019 at 2:35 pm

    For multi-base calculations, Gauge is a good option.

    • Hvg
      October 15, 2019 at 11:56 am

      Ja na!

  2. Leroy Kegan
    March 17, 2019 at 12:22 am

    I miss Scalar in this comparison. The advantage of Scalar is that it is powered by math engine. This gives a flexibility of scripting (a kind of a command line calculator). Additionally Scalar delivers function charts with many customization features. Strong recommendation of mine.

  3. SuryaHS
    February 20, 2019 at 3:16 am

    Thank you for this useful article.

  4. Ric
    August 25, 2018 at 3:24 pm

    I miss the floating calculator from xperia. When pressing the recent apps, there's a shortcut for floating calculator.

  5. mathle
    August 23, 2018 at 11:18 pm

    I recommend NCalc+ too!

  6. MLXG
    August 22, 2018 at 10:46 pm

    HiperCalc is a good scientific calculator for engineer's use. Its feature includes complex calculation, fraction & graphing --- all necessary features for me at least. You could put it up in this list although its free version lacks some functionality.