Free online tools

Calculate completed years, months, and days from a birth date to an as-of date.

Count days between two calendar dates using exclusive or inclusive mode.

Calculate discount amount and final price from an original price and discount percent.

Calculate a percentage of any value with a clear, copyable result.

Convert USD, KRW, EUR, JPY, GBP, CNY, and other common currencies with live reference rates.

Convert length values across metric and imperial units.

Convert Celsius, Fahrenheit, and Kelvin temperatures.

Convert weight and mass values across metric and imperial units.

Count total characters, characters without spaces, and lines.

Estimate reading time from word count and words-per-minute speed.

Count words, characters, and non-space characters in pasted text.