Length Converter
Convert km, meters, inches, yards, miles, feet and light-years
Length conversion: metric vs imperial
The metric system (kilometers, meters, centimeters) is used by most countries. The imperial system (miles, feet, inches) is still common in the US, UK and Canada for some measurements.
Essential conversions to know
1 mile = 1.609 km | 1 km = 0.621 miles | 1 foot = 30.48 cm | 1 inch = 2.54 cm | 1 yard = 0.9144 m. Average human height (5'9") equals 175 cm in metric.
Astronomical units
A light-year is the distance light travels in one year: 9.461 × 10¹⁵ meters. A nautical mile (1,852 m) is used in maritime and aviation navigation, equal to one arcminute of latitude.
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Our tools are used daily by students, real-estate professionals, developers, designers, travelers and curious minds. Each tool comes with detailed documentation, formulas, reference values and practical tips to help you get the most out of it. We regularly ship new tools and improvements based on community feedback.
Frequently asked questions
Is this tool really free?
Yes, OmniTools is completely free, with no sign-up and no usage limit. No credit card required.
Is my data sent to a server?
No. All calculations and conversions run in your browser. Your data stays private on your device.
Does it work on mobile?
Yes, the interface is fully responsive and optimized for smartphones, tablets and desktops.
How often is the tool updated?
We continuously improve our tools based on user feedback to guarantee accuracy and reliability.