Unit Converter
Convert the units you use every day — length, weight, temperature, area, data storage, and speed — in one place. Enter a number, pick the unit to convert from and the unit to convert to, and the result appears instantly. Handy for overseas shopping, travel, cooking, and workout logs whenever you run into inch-centimeter, pound-kilogram, mile-kilometer, or Fahrenheit-Celsius conversions.
Examples
How many kilometers is 1 mile?
One mile is exactly 1.609344 km. A 5-mile run logged in your running app equals 5 × 1.609344 ≈ 8.05 km, and conversely 10 km is about 6.21 miles.
Converting 30°C to Fahrenheit
Using the formula °F = °C × 9/5 + 32, we get 30 × 9/5 + 32 = 86°F. Conversely, 86°F is (86 − 32) × 5/9 = 30°C.
How many megabytes is 1 GB?
Computers use binary, so 1 GB = 1024 MB and 1 MB = 1024 KB. For example, 4 GB of memory equals 4096 MB.
FAQ
How many centimeters is 1 inch?
One inch is exactly 2.54 cm, a value fixed by the 1959 International Yard and Pound Agreement. For example, the diagonal of a 27-inch monitor is 27 × 2.54 = 68.58 cm.
How many kilograms is 1 pound?
One pound (lb) is exactly 0.45359237 kg, or roughly 0.45 kg. Conversely, 1 kg is about 2.2046 pounds. This conversion comes up often with gym dumbbell weights and shipping weights for overseas orders.
Is data storage based on 1000 or 1024?
Operating systems and software traditionally use 1 KB = 1024 B (binary, strictly KiB), while storage manufacturers use 1 KB = 1000 B (decimal). That is why a hard drive labeled 1 TB shows up as about 931 GB on your computer. This converter uses the 1024 convention.
Can I convert between pyeong and square meters?
Yes, the area mode supports pyeong ↔ m² conversion (1 pyeong = 3.3058 m²). For Korean real estate areas such as exclusive and supply area, however, the dedicated pyeong converter is more convenient.
What is a knot?
A knot is a speed unit used by ships and aircraft. One knot is the speed of traveling one nautical mile (1,852 m) per hour, so 1 knot = 1.852 km/h ≈ 0.514 m/s. A ship sailing at 20 knots moves at about 37 km/h.
What is the SI system of units?
The SI system is the international standard system of units built on seven base units: the meter (m), kilogram (kg), second (s), ampere (A), kelvin (K), mole (mol), and candela (cd). Prefixes such as milli (1/1000), centi (1/100), and kilo (×1000) express magnitude, so conversions between units are simple powers of ten.
In contrast, the customary units used in the United States (inches, feet, miles, ounces, pounds, Fahrenheit) do not convert to SI by neat ratios, making mental math difficult. A converter is the accurate way to read product dimensions, recipes, and weather information from foreign websites.
Common conversion values at a glance
Length and weight: 1 inch = 2.54 cm, 1 foot = 30.48 cm, 1 yard = 0.9144 m, 1 mile = 1.609 km, 1 ounce = 28.35 g, 1 pound = 453.6 g, 1 kg = 2.2046 lb.
Temperature, area, and speed: 0°C = 32°F, 100°C = 212°F, absolute zero 0 K = −273.15°C, 1 pyeong = 3.3058 m², 1 hectare = 10,000 m², 1 acre ≈ 4,047 m², 1 knot = 1.852 km/h, 60 mph ≈ 96.6 km/h.
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