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Calculator Library started developing online calculators in 1998. Since then, we've grown to become one of the best collections of free calculators on the Internet. Right now, we have 87 calculators in the following categories:

You can click any of the buttons above to go to the relevant calculator category, or click here to see every calculator currently available on our site.

Unique Calculators

We try to cover the most popular calculator categories but we get really excited to present many unique calculators you won't find anywhere else.

For example, our Email Address Calculator allows you to check if an email address is properly formatted, valid and working. In other words, you can test an email address without actually sending an email to it.

What's The Best Calculator?

We're asked this question a lot but there's no easy answer because it varies from person to person and depends on your personal needs. Our aim is simply to provide as many useful calculators as possible so you can decide which calculators are best for your specific needs.

Finance and health/fitness calculators always rank highly on peoples' lists of favourites, however we ourselves love emulators - calculators that look, feel and operate the same as their real-world versions. If we had to pick a favourite, it would be our Financial Programmable Calculator.

Find Out More

If you want to learn more about our many free online calculators, or calculators in general, check out our Calculator Blog here. In particular, our Top 10 Popular Online Calculators article discusses the calculators our visitors use most. If you have any questions about our site, please visit our FAQ.

Stay Informed

We always have more calculators in development and you can check out some of our newest calculators here. Click the "Calculator Notifications" button above to be kept informed about our latest developments and new calculators as we continue to add them.

Request A Calculator

Please contact us at any time if you have a special request for a particular type of calculator. We'd love to hear from you.