Conversion Result
What is Length Unit Conversion?
Length unit conversion is the process of changing units to express the same length in different measurement systems.
For example, converting 1 meter to centimeters gives 100 cm.
You can convert between SI units, Imperial/US units, and traditional units from Korea, China, and Japan.
How to Use the Length Unit Converter
Enter the value you want to convert.
Select the current unit (e.g., m, cm, in, ft).
Choose the target unit for conversion.
Click the convert button to see the result.
Frequently asked questions (FAQs)
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Which units does this converter support?
It supports SI units (m, cm, mm, km), Imperial/US units (in, ft, yd, mi), and traditional units from Korea, China, and Japan (chon, ja, gan, cheok, ri, etc.).
Additionally, nanometer (nm), micrometer (µm), picometer (pm), and femtometer (fm) are also available. -
How is the conversion calculated?
The conversion uses meters (m) as the base unit, with predefined meter values for each unit.
Conversion formula:
Result = Input × (meter value of source unit) ÷ (meter value of target unit) -
Can I enter decimal values?
Yes, you can. For example, converting 1.5 m to cm gives 150 cm.
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Are Imperial and US units different?
Length units are the same. Inch, foot, yard, and mile have identical definitions, so conversion results are the same.
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Are Korean, Chinese, and Japanese traditional units accurate?
Customary standards are used.
Examples:
Korea: 1 Ja ≈ 30.3 cm, 1 Gan ≈ 1.8 m
China: 1 Chi (尺) ≈ 33.33 cm
Japan: 1 Shaku (尺) ≈ 30.3 cm -
What if the input value is too large or too small?
Conversion is possible, but the UI should recommend appropriate units, such as km for very large values or nm for very small values.
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Can rounding errors occur?
Minor differences may occur depending on displayed precision.
Keep maximum precision internally and display results with about 4–6 decimal places.
Conversion units and descriptions
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Femtometer (fm)
1 fm = 10⁻¹⁵ m, used for measuring atomic nucleus size.
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Picometer (pm)
1 pm = 10⁻¹² m, used for measuring atomic and molecular dimensions.
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Nanometer (nm)
1 nm = 10⁻⁹ m, commonly used in semiconductors and nanotechnology.
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Micrometer (µm)
1 µm = 10⁻⁶ m, about the thickness of a human hair, used in precision engineering and biology.
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Millimeter (mm)
1 mm = 10⁻³ m, used for small components and everyday measurements.
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Centimeter (cm)
1 cm = 10⁻² m, widely used for general length measurements.
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Meter (m)
The base SI unit of length, internationally standardized.
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Kilometer (km)
1 km = 1000 m, used for road distances and geographic measurements.
International System of Units
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Inch (in)
1 in = 25.4 mm, used for small length measurements.
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Foot (ft)
1 ft = 12 in = 0.3048 m, commonly used in construction and body measurements.
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Yard (yd)
1 yd = 3 ft = 0.9144 m, used for sports fields and fabric measurements.
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Mile (mi)
1 mi = 1,609.344 m, used for road and travel distances.
Imperial/US Units
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Chon (Korea) (촌)
Approximately 3.03 cm, equivalent to the length of a finger joint.
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Ja (Korea) (자)
Approximately 30.3 cm, traditionally used in construction and tailoring.
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Gan (Korea) (간)
Approximately 1.8 m, used in traditional Korean architecture to indicate column spacing.
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Cheok (Korea) (척)
Approximately 30.3 cm, similar to Ja, used in woodworking and construction.
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Ri (Korea) (리)
Approximately 393 m, a traditional Korean unit for measuring road and geographic distances.
Korean Traditional Units
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Cun (China) (寸)
Approximately 3.33 cm, equivalent to the length of a finger joint.
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Chi (China) (尺)
Approximately 33.33 cm, traditionally used in construction and tailoring.
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Li (China) (里)
Approximately 500 m, a traditional Chinese unit for measuring distances.
Chinese Traditional Units
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Sun (Japan) (寸)
Approximately 3.03 cm, equivalent to the length of a finger joint.
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Shaku (Japan) (尺)
Approximately 30.3 cm, traditionally used in woodworking and construction.
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Ri (Japan) (里)
Approximately 3,927 m, a traditional Japanese unit for measuring long distances.
Japanese Traditional Units