Unit Converter – Convert 200+ Units Free Online

Select a category from the grid at the top (Length, Weight, Temperature, etc.). Then choose your source unit from the first dropdown and enter a value. The converted result appears instantly. You can also type in the right field to do a reverse conversion. Click the ⇄ swap button to reverse the direction at any time.

Temperature conversion is not a simple multiplication factor — it uses formulas. Celsius to Fahrenheit: °F = (°C × 9/5) + 32. Fahrenheit to Celsius: °C = (°F − 32) × 5/9. Celsius to Kelvin: K = °C + 273.15. The conversion formula is shown below the result so you can see exactly how the calculation was done.

This converter supports 12 categories: Length (meters, feet, miles, km, inches, yards, nautical miles, light years), Weight/Mass (kg, lbs, grams, ounces, tonnes, stones), Temperature (Celsius, Fahrenheit, Kelvin, Rankine), Area (sq meters, sq feet, acres, hectares), Volume (litres, gallons, cubic meters, cups, pints), Speed (km/h, mph, m/s, knots), Time (seconds, minutes, hours, days, weeks, months, years), Digital Storage (bytes, KB, MB, GB, TB), Pressure (Pascal, bar, psi, atm), Energy (joules, calories, kWh, BTU), Power (watts, kilowatts, horsepower), and Angle (degrees, radians, gradians).

All conversions use standard internationally accepted conversion factors with up to 15 significant digits of precision. Results are displayed with up to 10 significant figures, automatically removing unnecessary trailing zeros. For scientific or engineering work, all conversion factors are traceable to SI (International System of Units) definitions.

Yes! After entering a value, scroll down to see the "All Conversions" grid which shows the same value converted to every available unit in the selected category simultaneously. You can click any card to instantly set that unit as the target unit. This is useful when you need to compare a value across multiple units at once.