Length Converter
Convert between length units instantly with our free length converter. Supports 9 units including metric (mm, cm, m, km), imperial (inches, feet, yards, miles), and nautical miles. Get accurate conversions with up to 4 decimal places. Perfect for construction, travel, science, and everyday measurements.
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How to Use
- 1 Enter your value in the "From" field. You can type any number, including decimals (e.g., 5.5, 100, 0.25).
- 2 Select your units from the dropdown menus. Choose the unit you're converting from (e.g., feet) and the unit you want to convert to (e.g., meters).
- 3 See instant results as you type. The conversion happens in real-time with no delay. The result appears in the "To" field with up to 4 decimal places for precision.
- 4 Use the swap button (↔) to quickly reverse the conversion direction. This exchanges the "From" and "To" units and values.
- 5 Try quick conversions by clicking preset buttons like "Feet → Meters" or "Miles → Kilometers" for common conversions.
💡 Pro Tip: The converter handles very large and very small numbers automatically, using scientific notation when needed (e.g., 1.5e10 for 15 billion).
Frequently Asked Questions
What length units are supported?
Our length converter supports 9 units across three systems: Metric (millimeters, centimeters, meters, kilometers), Imperial (inches, feet, yards, miles), and Nautical (nautical miles). This covers the most common length measurements used worldwide for construction, travel, science, and everyday tasks. All conversions are based on internationally recognized standards.
How accurate are the conversions?
All conversions use precise conversion factors based on international standards. For example, 1 inch = exactly 0.0254 meters, and 1 mile = exactly 1609.344 meters. Results are displayed with up to 4 decimal places, which is sufficient for most practical applications. For scientific or engineering work requiring higher precision, the underlying calculations maintain full floating-point precision.
Can I convert very large or very small numbers?
Yes! The converter handles numbers from extremely small (like nanometers: 0.000000001 meters) to extremely large (like astronomical distances: billions of kilometers). For very large or very small numbers, the result automatically uses scientific notation (e.g., 1.5e10) for readability. You can also input numbers in scientific notation (e.g., type "1e6" for one million).
What's the difference between miles and nautical miles?
A statute mile (regular mile) is 5,280 feet or 1,609.344 meters, commonly used for land distances in the US and UK. A nautical mile is 6,076 feet or 1,852 meters, used in maritime and aviation navigation. Nautical miles are based on the Earth's circumference (1 nautical mile = 1 minute of latitude), making them ideal for navigation. Nautical miles are about 15% longer than statute miles.