Length Converter
Convert lengths between metric and imperial units
0.001
Kilometers (km)
100
Centimeters (cm)
1,000
Millimeters (mm)
1,000,000
Micrometers (μm)
0.000621
Miles (mi)
1.0936
Yards (yd)
3.2808
Feet (ft)
39.3701
Inches (in)
0.00054
Nautical Miles (nmi)
1.0570e-16
Light Years (ly)
Click any result to use it as the input value
Length Converter
Convert lengths between metric and imperial units
Features
- Convert between metric (mm/cm/m/km), imperial (in/ft/yd/mi), and specialised units (nautical mile, light-year, parsec)
- Precise factors: 1 in = 0.0254 m, 1 ft = 0.3048 m, 1 mi = 1609.344 m, 1 nmi = 1852 m
- Astronomical units supported for scientific work (AU, ly, pc)
- Decimal precision configurable up to 6 places
- Runs entirely in your browser
How to use
- Enter your input data in the provided field.
- Configure any options as needed.
- View the results instantly and copy or download the output.
Tips & Best Practices
- 1 inch is exactly 25.4 mm by international agreement (1959). All imperial-to-metric values derive from this.
- Nautical mile (1852 m) is the standard for maritime and aviation distances; one minute of latitude.
- For very large distances: 1 AU = 149,597,870.7 km · 1 ly ≈ 9.461 × 10¹⁵ m · 1 pc ≈ 3.262 ly.
- Use scientific notation for very small or large values (the input accepts e-notation: 1.5e6, 2.3e-9).
- Everything is computed locally; no values leave your browser.
FAQ
Is this tool free to use?
Yes, completely free with no registration, no limits, and no hidden costs.
Is my data private?
All processing happens in your browser. No data is ever sent to any server or third party.
Does it work offline?
Once loaded, the tool works entirely offline. All processing is done client-side with JavaScript.
Which browsers are supported?
Works in Chrome, Firefox, Safari, Edge, and all modern browsers on desktop and mobile.
Can I use the results commercially?
Yes, all output is yours to use freely in any personal or commercial project without restrictions.