Convert between different units of measurement instantly. Supports length, weight, temperature, area, volume, speed, and time conversions.
Unit conversion is the process of converting a quantity from one unit of measurement to another while maintaining the same value. This process is essential in science, engineering, construction, cooking, and everyday life when dealing with different measurement systems or units.
Accurate unit conversion is critical for several reasons:
Used by most countries worldwide. Based on multiples of 10, making conversions straightforward. Includes meters, liters, grams, and Celsius.
Primarily used in the United States. Includes inches, feet, miles, pounds, gallons, and Fahrenheit. Conversions are more complex.
The modern form of the metric system. Includes seven base units: meter, kilogram, second, ampere, kelvin, mole, and candela.
Convert between meters, kilometers, centimeters, inches, feet, yards, and miles.
Convert between grams, kilograms, pounds, ounces, and tons.
Convert between Celsius, Fahrenheit, and Kelvin scales.
Convert between square meters, square feet, acres, and hectares.
Convert between liters, milliliters, gallons, cups, and cubic meters.
Convert between km/h, mph, m/s, and knots.
Convert between seconds, minutes, hours, days, and years.
Convert between joules, calories, watts, and horsepower.
Convert between length, weight, temperature, area, volume, speed, and time units in one convenient tool.
Get instant conversion results as you type, with no need to submit forms or wait for page reloads.
Easily swap between "from" and "to" units with a single click for quick reverse calculations.
Access frequently used conversion factors and examples for quick reference and verification.
Use our converter on any device - desktop, tablet, or smartphone - with full functionality.
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Temperature conversions require specific formulas rather than simple multiplication:
| Conversion | Formula | Example |
|---|---|---|
| Inches to Centimeters | cm = in × 2.54 | 10 in = 25.4 cm |
| Feet to Meters | m = ft × 0.3048 | 5 ft = 1.524 m |
| Miles to Kilometers | km = mi × 1.60934 | 10 mi = 16.0934 km |
| Yards to Meters | m = yd × 0.9144 | 100 yd = 91.44 m |
| Conversion | Formula | Example |
|---|---|---|
| Pounds to Kilograms | kg = lb × 0.453592 | 10 lb = 4.53592 kg |
| Ounces to Grams | g = oz × 28.3495 | 16 oz = 453.592 g |
| Kilograms to Pounds | lb = kg × 2.20462 | 5 kg = 11.0231 lb |
| Grams to Ounces | oz = g × 0.035274 | 100 g = 3.5274 oz |
When converting measurements, maintain the appropriate number of significant figures based on the precision of your original measurement. Don't add false precision through conversion.
For important applications like medicine, engineering, or chemistry, always verify your conversions using a second method or tool to prevent errors.
Memorize frequently used conversions like inches to centimeters (2.54), pounds to kilograms (0.454), and miles to kilometers (1.609) for quick mental calculations.
For complex conversions, use the factor-label method (dimensional analysis) to ensure units cancel correctly and your final answer has the desired units.
Some conversions are context-dependent. For example, fluid ounces for volume are different from ounces for weight, and a ton can be metric, short, or long.