Free Calculators & Source Code

A collection of free online calculators with free open source code. All of our calculators are licensed under Creative Commons Attribution. That means we provide free source code and a credit link for every calculator. As long as you put the credit link on the same page as the calculator, you can use it for free and even modify it to fit your page’s design.

We’re constantly adding new calculators, so check back often or subscribe to our RSS feed

Loan Calculators

How much will your monthly loan payment be? How much can you save by getting better loan terms? Here’s a variety of loan-related calculators. We have (or will be adding) calculators related to mortgages, credit cards, auto loans, and student loans.

Health & Diet

What’s your BMI or BMR? How are your activities affecting your health? We have (or will be adding) calculators related to health, diet, and weight loss.

Fun Calculators

Want to calculate your compatibility with a love calculator? Find out how much you’d be worth if you were worth your weight in SPAM®? This is where the fun calculators go.