Unit Converter — Length, Weight, Temperature & More

Free Online Unit Converter

This unit converter lets you convert between metric, imperial, and US customary units instantly in your browser. Choose a category, pick your units, type a value, and the result appears immediately — no sign-up, no downloads, and no data sent to a server. Whether you need to convert meters to feet, kilograms to pounds, Celsius to Fahrenheit, or gigabytes to gibibytes, the tool handles it with precise, standards-based conversion factors.

Supported Unit Categories

The converter covers the seven categories people reach for most often:

• Length — millimeters, centimeters, meters, kilometers, inches, feet, yards, miles, and nautical miles
• Weight — milligrams, grams, kilograms, metric tons, ounces, pounds, stone, and US tons
• Temperature — Celsius, Fahrenheit, and Kelvin
• Volume — milliliters, liters, cubic meters, teaspoons, tablespoons, fluid ounces, cups, pints, quarts, and gallons
• Area — square meters, hectares, square feet, square yards, acres, and square miles
• Speed — meters per second, km/h, mph, feet per second, and knots
• Data storage — bits, bytes, and both decimal (KB, MB, GB, TB) and binary (KiB, MiB, GiB, TiB) units

How Unit Conversion Works

Every measurement system defines its units relative to an agreed standard. Since 1959, the international inch has been defined as exactly 25.4 millimeters, the pound as exactly 0.45359237 kilograms, and the mile as exactly 1,609.344 meters. This converter applies those exact definitions: your value is converted to a base unit (such as the meter or kilogram) and then into the target unit, so results are accurate to as many digits as you need.

Why Temperature Is Different

Unlike length or weight, temperature scales don't share a common zero point, so you can't convert them with a simple multiplication. The tool uses the standard formulas — for example, Fahrenheit equals Celsius times 9/5 plus 32, and Kelvin equals Celsius plus 273.15 — to give exact results across all three scales.

Decimal vs. Binary Data Units

Data storage has two competing conventions: decimal units where a kilobyte is 1,000 bytes, and binary units where a kibibyte is 1,024 bytes. Drive manufacturers typically advertise in decimal units while operating systems often report binary ones, which is why a "1 TB" drive shows up as roughly 931 GiB. This converter supports both so you can translate between them precisely.

Private and Fast by Design

All conversions run locally in your browser with no server round-trips, so results update the instant you type. Nothing you enter is logged or transmitted, the tool works on any device, and a built-in table shows your value converted to every unit in the category at once.