Convert various units
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1 inch = 2.54 cm, 1 mile = 1.609 km
1 pound = 453.6 g, 1 ounce = 28.35 g
1 pyeong = 3.3058 m², 1 acre = 4,047 m²
°F = °C × 9/5 + 32, K = °C + 273.15
1 KB = 1,024 B, 1 MB = 1,024 KB
1 Mach ≈ 340.29 m/s (sea level, 15°C)
Unit Converter is a comprehensive online tool that enables instant conversion between units of measurement across seven major categories: length, weight, temperature, area, volume, speed, and data size. Whether you are a student solving physics problems, an engineer working with international specifications, a traveler converting between metric and imperial systems, or a developer calculating data storage requirements, this tool provides accurate, real-time conversion results with an intuitive, easy-to-use interface.
Select a Category
Select the unit category you want to convert from length, weight, temperature, area, volume, speed, or data.
Choose the Source Unit and Enter a Value
Select the unit before conversion and enter a numeric value. For example, to convert from kilometers to miles, select 'Kilometers' and enter a value.
Select the Target Unit
Select the target unit for which you want to check the results. The converted results are displayed in real time as soon as you input them.
View All Results
In the overall conversion results area, you can check the converted values in all units of the category at once, making it convenient to compare multiple units.
Temperature units (Celsius, Fahrenheit, Kelvin) have different reference points, so conversion formulas are used rather than simple multiplication. For example, Fahrenheit = Celsius x 9/5 + 32, and Kelvin = Celsius + 273.15. The tool automatically applies these formulas to provide accurate conversion results.
1 pyeong is approximately 3.3058 square meters (m²). Pyeong is a unit traditionally used to express real estate area in Korea. Legally, square meters are the official unit, but pyeong is still widely used in everyday life. This tool makes it easy to convert between pyeong and square meters.
This tool uses the binary convention common in computing and calculates 1 KB as 1,024 bytes. Under the SI standard, 1 KB is 1,000 bytes and 1,024 bytes is written as 1 KiB (kibibyte), but the 1,024-byte convention remains widely used in practice.
Mach is the ratio of speed relative to the speed of sound, so it depends on temperature and pressure. This tool calculates the speed of sound at 15 degrees C at sea level (approximately 340.29 m/s). The actual speed of sound may change as altitude increases, so please use it as a reference value.
Yes, US and Imperial have different volumes. This tool uses US units as reference. A US gallon is approximately 3.785 liters and an Imperial gallon is approximately 4.546 liters, a difference of approximately 20%. A US pint is approximately 473ml and an Imperial pint is approximately 568ml.