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Unit Converters 2026

Free unit converters for length, weight, temperature, volume, speed, and area. Convert metric to imperial and back instantly. No signup required. Results in seconds.

Free unit conversion tools covering the most common everyday and technical measurement needs. Convert length, weight, temperature, volume, area, and speed between metric and imperial units instantly. Results update as you type, no conversion button required.

The unit converter supports meters to feet, kilograms to pounds, Celsius to Fahrenheit, liters to gallons, square meters to square feet, and kilometers per hour to miles per hour, plus dozens more unit pairs across all six categories. Useful for cooking, travel, engineering, science, and everyday calculations.

Converters

Unit Converter

Length, weight, temperature, and more.

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Free unit converters for every measurement type. All conversions run instantly in your browser with no server requests. Results are precise to 10 decimal places.

Length and distance

Convert between metric and imperial length units: millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles. The converter handles both everyday measurements and scientific precision. Common conversions: centimeters to inches (multiply by 0.394), kilometers to miles (multiply by 0.621), meters to feet (multiply by 3.281).

Weight and mass

Convert between grams, kilograms, metric tons, ounces, pounds, and stones. Useful for cooking, shipping, fitness, and scientific work. Key conversions: 1 kilogram equals 2.205 pounds, 1 ounce equals 28.35 grams, 1 stone equals 6.35 kilograms.

Temperature

Convert between Celsius, Fahrenheit, and Kelvin. Celsius to Fahrenheit: multiply by 9/5 and add 32. Fahrenheit to Celsius: subtract 32 and multiply by 5/9. Key reference points: 0°C is 32°F (water freezes), 100°C is 212°F (water boils), 37°C is 98.6°F (body temperature), 20°C is 68°F (room temperature).

Volume and speed

Volume conversions cover liters, milliliters, US gallons, imperial gallons, fluid ounces, and cups. Speed conversions cover kilometers per hour, miles per hour, meters per second, and knots. All conversions use exact internationally defined ratios.

Frequently asked questions

How do I convert Celsius to Fahrenheit?
Formula: °F = (°C × 9/5) + 32. Example: 20°C = (20 × 1.8) + 32 = 68°F. Key reference points: 0°C = 32°F (freezing), 20°C = 68°F (room temperature), 37°C = 98.6°F (body temperature), 100°C = 212°F (boiling). For Fahrenheit to Celsius: °C = (°F - 32) × 5/9. Select Temperature in the unit converter above for instant conversion.
How do I convert kilograms to pounds?
Multiply kilograms by 2.20462. Example: 70 kg × 2.20462 = 154.3 lbs. To convert pounds to kilograms, multiply by 0.453592. Quick reference: 50 kg = 110.2 lbs, 70 kg = 154.3 lbs, 80 kg = 176.4 lbs, 100 kg = 220.5 lbs. For grams to ounces: multiply grams by 0.035274. For ounces to grams: multiply by 28.3495.
How do I convert miles to kilometers?
Multiply miles by 1.60934. Example: 10 miles × 1.60934 = 16.09 km. For kilometers to miles, multiply by 0.621371. Quick reference: 1 mile = 1.609 km, 5 miles = 8.05 km, 26.2 miles (marathon) = 42.2 km, 100 km = 62.1 miles. Most European road signs use km/h while US and UK signs use mph.
What is the difference between US and Imperial gallons?
1 US gallon = 3.785 liters. 1 Imperial (UK) gallon = 4.546 liters. 1 US gallon = 0.833 Imperial gallons. Fluid ounce differences: 1 US fl oz = 29.57 ml, 1 Imperial fl oz = 28.41 ml. The difference matters for fuel economy: 30 miles per US gallon = 36 miles per Imperial gallon. Weight units (pounds, ounces) are identical between US and Imperial. Volume is where the systems differ.
How do I convert square feet to square meters?
Multiply square feet by 0.0929. Example: 1,000 sq ft × 0.0929 = 92.9 sq meters. For square meters to square feet, multiply by 10.764. Quick reference: 500 sq ft = 46.5 sq m, 1,000 sq ft = 92.9 sq m (small apartment), 2,000 sq ft = 185.8 sq m (average US home). For acres to hectares: multiply by 0.404686.
How do I convert liters to gallons?
For US gallons: multiply liters by 0.264172. Example: 10 liters × 0.264172 = 2.64 US gallons. For Imperial gallons: multiply liters by 0.219969. One US gallon = 3.785 liters, one Imperial gallon = 4.546 liters. Common reference: a standard water bottle is 500 ml (0.5 liters), a car fuel tank of 50 liters = 13.2 US gallons.
How do I convert centimeters to inches?
Multiply centimeters by 0.393701. Example: 30 cm × 0.393701 = 11.81 inches. For inches to centimeters, multiply by 2.54. Quick reference: 1 inch = 2.54 cm, 1 foot (12 inches) = 30.48 cm, 1 meter = 39.37 inches, 6 feet = 182.9 cm. Height conversions: 5'10" (70 inches) = 177.8 cm, 6'0" (72 inches) = 182.9 cm.
How do I convert km/h to mph?
Multiply km/h by 0.621371. Example: 100 km/h × 0.621371 = 62.1 mph. For mph to km/h, multiply by 1.60934. Quick reference: 50 km/h = 31.1 mph, 80 km/h = 49.7 mph, 100 km/h = 62.1 mph, 130 km/h = 80.8 mph. Common speed limits: US highways 65-70 mph (105-113 km/h), European motorways 130 km/h (80.8 mph).