Welcome to That Calculator

We are here to help you Calculate with ease, and find 'that calculator' you need!
From simple math to complex calculations, we've got you covered.


Popular calculators

Check out some of our popular calculators.

Circumference Calculator

Our circumference calculator is here to help you find the circumference of a circle. With this tool, you can find the circumference using a diameter or a radius.

Fahrenheit to Celsius Converter

That Calculator Fahrenheit to Celsius temperature Converter is the best tool for converting between Fahrenheit and Celsius temperature.

Time from Date Calculator

Calculating the duration between two times can be tricky depending on the number of minutes and seconds in the two times being compared. Our Time from Date Calculator will make this easy for you.

Miles to Kilometers Converter

Welcome to our miles to Kilometers converter, a tool that quickly converts miles to km and km to miles. Miles and kilometers are both units used to measure distance, but they are not the same.

Days Until Calculator

Tired of manually counting the days until your special event? Don't worry, our days until calculator is here to make your life easier. This handy tool will tell you exactly how many days are left until your big day, whether it's a birthday, holiday, or important deadline.

Age in Years Calculator

Our age in years calculator can find a person's age from their birthday. Simply enter their birthday and we'll tell you how old they are.

Bar to Psi Conversion

Our Bar to Psi converter is the perfect tool to convert pressure from bar to psi or vice versa quickly.

Gradient Calculator

Our gradient calculator is the perfect tool for finding the gradient of a line from two points on that line. Our calculator shows the rise, run and gradient.


At ThatCalculator.com, our mission is to provide a one-stop hub for all your calculation needs. We believe that everyone deserves easy access to tools that make calculations simple and efficient. Learn more


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