Convert length, weight, speed, area, and more. Free, fast, no sign-up.
Length: 1 meter = 3.281 feet | 1 mile = 1.609 km | 1 inch = 2.54 cm
Weight: 1 kg = 2.205 lbs | 1 stone = 6.35 kg | 1 oz = 28.35 g
Speed: 1 km/h = 0.6214 mph | 1 knot = 1.852 km/h
Area: 1 acre = 4047 m² | 1 hectare = 10,000 m²
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Select Category: Choose from length, weight, volume, temperature, area, speed, and more. Enter Value + Unit: Type your number and select the source unit. The result updates instantly in all other units of that category. Common Conversions: Miles to kilometers, pounds to kilograms, gallons to liters, feet to meters, and Fahrenheit to Celsius are the most-used conversions globally. Accuracy: Results use standard conversion factors accurate to 4 decimal places.