About CalcJar

CalcJar is a growing library of free online calculators and utility tools. Every tool is built to be fast, accurate, and easy to use — right in your browser, with no signup, no downloads, and no tracking.

Our philosophy

You shouldn't need to download an app or create an account to split a bill, calculate compound interest, or check your BMI. CalcJar gives you instant answers to everyday questions, designed for clarity and speed.

Accuracy

All calculations run locally in your browser. Results are estimates and should not be used as substitutes for professional financial, medical, or legal advice. Always consult a qualified professional for important decisions.

Privacy

Your inputs never leave your device. All calculations happen client-side in your browser. We do not store, transmit, or log any data you enter into our tools. We use Google AdSense to display ads, which may use cookies for ad personalization. See our Privacy Policy for details.

Contact

Have a suggestion for a new tool, or found a bug? We'd love to hear from you at our contact page.