Length Converter

What this tool does

Length Converter changes any distance between metric, imperial, nautical and astronomical units using exact international definitions. Enter a value once and see it in every supported unit, with adjustable precision.

Length units differ between countries and industries. Builders in India may quote plot sizes in gaj, engineers use millimetres, pilots and sailors use nautical miles and many product listings still give dimensions in inches. Converting by memory is a common source of costly mistakes, from furniture that does not fit to wrongly cut materials.

This converter uses exact definitions: since 1959 the international inch is exactly 2.54 centimetres and the yard exactly 0.9144 metres, and the nautical mile is defined as exactly 1,852 metres. Because every conversion passes through the metre using these fixed factors, the results are precise to the number of decimal places you choose.

How to use Length Converter

1. Type the value you want to convert in the Value field.
2. Pick the unit you are converting from and the unit you want.
3. Read the result instantly; click the copy icon to copy it.
4. Use the swap button to reverse the conversion direction.
5. Adjust Decimal places for more or less precision.
6. Check the table below to see the same value in every supported unit at once.

Tips for better results

• For quick mental estimates, 1 inch is about 2.5 cm and 1 mile is about 1.6 km, but use the exact result for anything you will build or order.
• Very large or very small results switch to scientific notation automatically so they stay readable.
• Your last unit choices are remembered in this browser, which is handy if you repeat the same conversion often.

Common use cases

• Converting product dimensions from inches to centimetres when shopping internationally.
• Translating running or cycling distances between kilometres and miles.
• Converting plot measurements between gaj, feet and metres.
• Checking nautical distances for sailing or aviation planning.

Common mistakes to avoid

• Confusing the nautical mile (1,852 m) with the statute mile (1,609.344 m).
• Rounding too early in a multi-step calculation; keep full precision until the final result.
• Mixing up length and area units: converting square feet needs the Area Converter, not this tool.