The Perfect Calculator

A clean and easy to use All-In-One Calculator with a complete set of tools for day-to-day use, such as unit converter, currency converter, percentage calculator and more.




Star Rating





What Our Users Say?

I've been relying on this app for many years now and it has never let me down. It always has what I need, when I need it, and finding it is speedy. The UI flows very nicely. The ability to create custom calculations and converters really sets this app apart. Specially useful for all the different branches of industries, research, and technical trades one may be working in. I rarely leave reviews but this app deserves it. Keep up the great work who ever y'all are.

Jacob S. — June 20, 2022

This app just keeps getting better. The community library to share custom tools is a fantastic addition. The way custom tools resolve cyclically is very useful and not a function I've found elsewhere.

Amy Taylor — August 2, 2022

I'm a person who has to download and try all recent apps and narrow down to a favorite and this calc app is best I've found so far. This is namely for people who like customization and a lot of available features. It is the most convenient and quick-to-access unit converter and calculator. Enough options to satisfy most anyone. Every feature has an available shortcut which makes it integrate or enables utilization by many other apps such as Tasker. Great job and thanks for the customization.

D. Kwon — March 6, 2021

I have had this app installed on my phone and tablet (both Android) for years. It has every type of commonly used calculations, conversions and measurements, and many uncommon types too. You can customize how quickly you can access any number of its features making it versatile as well. Basically, it's got EVERYTHING a good app should for those of us whom are mathematically challenged.

Xena Bean — May 15, 2021

This is my first time complimenting an app here. Well this app is simply exceptional. A great tool for everyday computation. I really loved the costumize tool and also the part where you can use all the features with just some ads. All in all its a great experience using it.

Junar Amaro — July 1, 2020



Solve linear, quadratic, cubic equations or equation systems. Calculate percentages, proportions, ratios. Find out means. Check prime numbers and more.



Calculate all dimensions for more than 30 geometric shapes and bodies using any known variables.

Unit Converters

Easily convert between all related units on the same screen. More than 1000 units included in 80 categories.

Unit Converter


Solve Ohm's law. Calculate resistor color code, parallel and series components, power triangle, voltage dividers. Estimate battery life. Convert analog-to-digital values and more.


Convert between 160+ currencies, available offline as well. Calculate sales tax and interest. Find out the tip for a bill.



Find out the time difference between two dates. Solve analytical geometry.

But wait, there's more!


Create shortcuts for the most used calculators on your home screen.

Custom Tools

Copy and modify any of the existing tools, or create your own, with up to 25 variables and lots of functions.

Calculator Shortcuts

Floating Calculator

Calculate over other apps easily with the floating calculator widget.

Community Library

Growing library with custom calculators created by the CalcKit cummunity, available for everyone.

Contact Us

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All-In-One Calculator