How to Use This Unit Converter

Select a unit category from the tabs above — Length, Weight, Temperature, Volume, and more. Enter any value in the input field and choose your starting unit from the dropdown. All other units in that category update instantly, so you can see every conversion at once without switching between different tools or making multiple searches.

Click any result card to copy the converted value to your clipboard. The value is copied as a plain number, ready to paste into a document, spreadsheet, or message. Your last selected category and unit are saved automatically, so they will be ready the next time you visit.

Supported Conversion Categories

Length covers metric units (kilometers, meters, centimeters, millimeters, micrometers) and imperial units (miles, yards, feet, inches), plus nautical miles for marine and aviation use.

Weight and Mass includes kilograms, grams, milligrams, metric tons, pounds, ounces, and stones — covering everything from cooking ingredients to body weight to shipping.

Temperature converts between Celsius, Fahrenheit, and Kelvin using exact formulas rather than simple multiplication, since temperature scales have different zero points.

Volume supports both metric (liters, milliliters, cubic meters) and US customary units commonly used in cooking — gallons, quarts, pints, cups, fluid ounces, tablespoons, and teaspoons.

Area converts between square meters, square kilometers, hectares, acres, square miles, square yards, square feet, and square inches — useful for real estate, construction, and land measurement.

Speed handles meters per second, kilometers per hour, miles per hour, knots, and feet per second. Time converts between milliseconds, seconds, minutes, hours, days, weeks, months, and years. Digital Storage uses binary units (1 KB = 1,024 bytes) to convert between bits, bytes, kilobytes, megabytes, gigabytes, terabytes, and petabytes. Pressure covers pascals, kilopascals, bar, atmospheres, PSI, and mmHg. Energy converts between joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, and BTU.

Why Measurement Systems Differ

Most of the world uses the metric system (SI), which is based on powers of 10 — making conversions between units straightforward. The imperial system, still used primarily in the United States, Myanmar, and Liberia, uses historical relationships between units that are harder to memorize: 12 inches in a foot, 3 feet in a yard, 5,280 feet in a mile.

This tool bridges the gap between both systems instantly, so you never have to memorize conversion factors or work through multi-step calculations by hand.

Common Conversion Quick Reference

Some of the most frequently searched conversions include: 1 inch = 2.54 cm, 1 mile = 1.609 km, 1 pound = 0.4536 kg, 1 gallon (US) = 3.785 liters, and °F = (°C × 9/5) + 32. Rather than looking these up individually, this converter shows all related conversions at once — enter any value and see every unit in the category simultaneously.

Privacy

This tool runs entirely in your browser. No data is sent to any server. All conversion calculations happen locally using JavaScript, and your settings are stored only in your browser's local storage.

Read the story behind this tool: Why I Built a Unit Converter When Google Already Has One