Length Converter
Convert between cm, inch, ft, m, km, and mile
What is a Length Converter?
A length converter converts distances between units such as millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles. It helps with travel, DIY projects, science homework, fitness tracking, and international shopping where measurements use different systems worldwide.
Instant results run client-side with no signup. Whether you are converting a room dimension from meters to feet or a runway length from miles to kilometers, one input updates the output immediately on any device.
How to Use This Length Converter
- Enter the numeric value you want to convert.
- Choose the from unit (e.g., centimeters).
- Choose the to unit (e.g., inches).
- Read the converted result immediately as you type or change units.
- Copy the result for notes, shopping lists, or messages to colleagues.
Common Conversion Factors
1 inch = 2.54 cm (exact). 1 foot = 12 inches. 1 yard = 3 feet. 1 mile = 1.609344 km. 1 meter = 100 cm. 1 kilometer = 1,000 meters. These standard factors are used for consistent results suitable for everyday and educational use.
For scientific work, prefer SI units and document rounding. For construction in the US, feet-inch fractions may still be used on site even when plans list metric — this converter helps bridge both worlds quickly and accurately.
Frequently Asked Questions
How do I convert cm to inches?
Divide centimeters by 2.54 or use this tool: enter your cm value, select centimeters as input and inches as output. Example: 170 cm ≈ 66.93 inches.
How many feet are in a meter?
One meter is approximately 3.28084 feet. Enter 1 in meters and convert to feet for exact figures at the precision displayed.
Is the conversion exact?
Conversions use standard defined ratios (e.g., inch–cm). Displayed decimals are rounded for readability; for engineering tolerances, verify required precision.
Does it support metric and imperial?
Yes. Convert in either direction between common metric and US/imperial length units available in the dropdowns.
Why is 170 cm a common height example?
170 cm is a frequently cited average adult height in metric countries. Converting it to inches (about 66.9 in or 5 ft 7 in) helps when filling US forms that ask for feet and inches.
Can I convert negative lengths?
Length is normally non-negative. If you enter a negative value, results may still compute mathematically but are rarely meaningful for physical distance — use positive magnitudes for real-world measurements.
Related Tools
Also see Area Converter, Weight Converter, and Speed Converter for other unit conversions used in travel, science, and engineering homework.