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.

Pregnancy Due Date Calculator

Start your countdown to your due date with our Pregnancy Due Date Calculator. Waiting for a baby is one of the most exciting times in life. It's no wonder you want to count down the days until your family grows.

Grams to Ounces Calculator

The grams to ounces converter is a handy tool that allows you to switch between grams and ounces easily. It can convert grams to ounces or ounces to grams, depending on your needs.

Milliseconds to Seconds Converter

Our Milliseconds to Seconds Converter allows you to convert seconds to milliseconds and milliseconds to seconds quickly. It's a simple tool for anyone who needs to convert seconds to milliseconds.

Days Between Dates Calculator

Our Days Between Dates Calculator helps you figure out how many days lie between two different dates. Are you wondering how much time has passed since an important event happened? Or maybe you need to know how many days remain until an upcoming occasion?

Metres to Feet Converter

Our Metres to Feet converter is a handy tool that helps you convert lengths from Metres (m) to feet (ft) or vice versa.

Atomic Mass Calculator

An atom's mass comes from the tiny particles called protons, neutrons, and electrons. However, electrons don't add much to the mass because they are 1,836 times lighter than protons.

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.

Due Date Calculator

The due date calculator (also called a pregnancy calculator) helps answer the question: "When is my baby due?" Our tool estimates the due date for your baby's birth.


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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