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.

Weeks to Years Converter

Our Weeks to Years Converter is a simple tool for converting weeks to years and years to weeks, all you need to do is enter the number of weeks and click on the convert button.

Feet and Inches Calculator

Have you ever struggled with adding up feet and inches or figuring out the area of your room? Well, you're in luck! A Feet and Inches Calculator is here to save the day.

Percentage Decrease Calculator

Our percentage decrease calculator will help you calculate the percentage decrease between two values.

Litres to Gallon Converter

Our Liter to Gallon converter is a nifty tool that helps you convert the volume of liquids from liters (l) to gallons (gal) or vice versa.

Percentage Difference Calculator

Our percentage difference calculator is here to help you calculate the percentage difference between two numbers, provide the two values and our calculator will do the rest.

cm to in Converter

Have you ever wondered how to switch between centimeters (cm) and inches (in)? This calculator will help you do the maths with ease.

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.

Celsius to Fahrenheit Converter

With our Celsius to Fahrenheit converter, you can easily change temperatures between Celsius and Fahrenheit scales. Enter your temperature value, and we'll show you the equivalent in the other unit.


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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