Guides

These guides explain each tool in plain language, with a worked example you can follow in under a minute. Every tool on this site works in your browser, with no signup and no upload.

• Length Converter - Convert length between meters, kilometers, centimeters, millimeters, miles, yards, feet, and inches.
• Weight Converter - Convert weight between kilograms, grams, pounds, and ounces with exact standard factors.
• Temperature Converter - Convert temperature between Celsius, Fahrenheit, and Kelvin using the correct formulas.
• Speed Converter - Convert speed between meters per second, kilometers per hour, miles per hour, knots, and feet per second.
• Area Converter - Convert area between square meters, square kilometers, hectares, acres, square feet, square yards, and square miles.
• Volume Converter - Convert volume between liters, milliliters, cubic meters, US gallons, quarts, pints, cups, and fluid ounces.
• Pressure Converter - Convert pressure between pascals, kilopascals, bar, psi, atmospheres, and millimeters of mercury.
• Energy Converter - Convert energy between joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, and BTUs.
• Data Storage Converter - Convert data storage between bytes, kilobytes, megabytes, gigabytes, and terabytes using 1024-based units, with the 1000-based decimal note explained.

General tips

1. Start with the value you already know, for example a length in miles or a monthly salary.
2. Check the unit or input label before you convert or calculate, because a wrong unit is the most common source of a wrong answer.
3. Use the Copy button to paste the result into a document, message, or spreadsheet without retyping it.
4. For important decisions, such as a job offer or a tax filing, double-check the result against an official source.