Simple calculators

Free tools that work right in your browser. No sign-up, and nothing you type is sent to a server.

Tools

• Age CalculatorEnter a date of birth to get your exact age in years, months and days…Date & Age
• Date CalculatorCount the days between two dates, find the date a number of days, wee…Date & Age
• JSON Formatter & ValidatorPaste JSON to format it, find the exact line and column of any error …Developer
• Percentage CalculatorWork out X% of a number, what percent one number is of another, perce…Math
• Time CalculatorFind the hours and minutes between two times (with breaks and overnig…Math
• Korean Name to EnglishWrite a Korean name in English letters.Text
• Area Converter (m² to ft²)Convert square meters to square feet and back, and see the area in Ko…Units
• Unit ConverterConvert inches to cm, pounds and stone to kg, °F to °C, US and UK gal…Units