Small tools for everyday questions
Some questions come up again and again: how old is someone exactly, what is 20% of a number, how many days until a deadline, or what time is it on the other side of the world. These everyday tools answer them instantly — no app to install, no account, and nothing you type ever leaves your browser.
Find an exact age with the Age Calculator, run any of three calculations with the Percentage Calculator, and measure spans of time with Date Difference and Time Duration. For working across regions, use the Time Zone Converter or the developer-friendly Epoch Converter.
Frequently asked questions
Do these tools cost anything? No — they are all free to use with no sign-up and no usage limit.
Is my input stored? No. Everything is calculated in your browser, so nothing you enter is uploaded or kept.
Do the date and time tools handle time zones? Yes. The time zone converter is DST-aware and the epoch converter shows your local time alongside UTC.