Unit Converters — Free Online Tools
Length, weight, temperature, speed, area, volume, data storage converters. Convert length, weight, temperature, speed, area, volume, data, pressure, energy, and fuel use between any two units.
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Length Converter
Free length converter for meters, feet, inches, miles, kilometers, yards, and centimeters. Convert any measurement between units instantly.
OpenWeight Converter
Free weight converter for kilograms, pounds, grams, ounces, stones, and tons. Convert any mass measurement between units instantly.
OpenTemperature Converter
Free temperature converter for Celsius, Fahrenheit, and Kelvin. Convert temperatures precisely between all three scales instantly.
OpenSpeed Converter
Free speed converter for mph, km/h, knots, meters per second, and more. Convert any speed measurement between units instantly.
OpenArea Converter
Free area converter for square meters, square feet, acres, hectares, and more. Convert any area measurement between units instantly.
OpenVolume Converter
Free volume converter for liters, gallons, cups, milliliters, cubic meters, and more. Convert any capacity measurement between units instantly.
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Data Storage Converter
Free data storage converter for bytes, kilobytes, megabytes, gigabytes, terabytes, and more. Convert digital storage instantly.
OpenPressure Converter
Free pressure converter for psi, bar, pascals, atmospheres, and more. Convert any pressure measurement between units instantly.
OpenEnergy Converter
Free energy converter for joules, calories, kilowatt-hours, BTUs, and more. Convert any energy measurement between units instantly.
OpenFuel Consumption Converter
Free fuel consumption converter for MPG, liters per 100 km, km per liter, and more. Convert fuel efficiency instantly.
OpenAbout Unit Converters
Whether you're reading a recipe in metric, sizing a part in imperial, or translating storage from gigabytes to tebibytes, our 10 free unit converters make a clean swap between any two units. Length, weight, temperature, speed, area, volume, data storage, pressure, energy, and fuel consumption are all included.
Each converter uses precise conversion factors and handles the common pitfalls automatically — for instance, temperature conversions apply the offset-and-scale formulas rather than a simple ratio, because Celsius and Fahrenheit don't share a true zero. Select your units, type the value, and read the result with no rounding surprises.
Perfect for engineers, students, travelers, and anyone whose work crosses unit systems. All conversions run instantly in your browser with no sign-up and no tracking.