# Length Converter

> Free length converter: convert between millimeters, centimeters, meters, kilometers, inches, feet, yards, miles and nautical miles instantly.

Convert between millimeters, centimeters, meters, kilometers, inches, feet, yards, miles and nautical miles. Type an amount, pick the units, get the answer instantly.

*Interactive tool: enter your values at https://toollantern.win/length-converter/ and results update instantly in your browser.*

## How the conversion works

Every unit is defined as an exact number of meters: 1 inch is **0.0254 m** exactly, 1 foot is **0.3048 m** exactly, 1 mile is **1609.344 m** exactly. To convert, the tool changes your amount into meters first, then into the target unit, so every pair converts through one consistent path.

## Worked example

Convert **5 miles** to kilometers: 5 × 1609.344 = 8046.72 meters, then 8046.72 ÷ 1000 = **8.04672 km**.

## A note on precision

Results show up to 8 significant digits, more than enough for everyday use. For surveying or engineering, remember that real-world measurements carry their own uncertainty far larger than any rounding here.

## Frequently asked questions
### How many centimeters are in an inch?

2.54 cm, exactly. The inch has been defined as exactly 25.4 millimeters since the 1959 international yard and pound agreement.

### What is a nautical mile?

1,852 meters exactly. It was originally one minute of latitude and is still the standard unit for sea and air navigation.

### Why is a mile 1.609344 kilometers?

It is the exact international definition: 1 yard = 0.9144 m, 1 mile = 1,760 yards, so 1 mile = 1,760 × 0.9144 = 1,609.344 m.

### How precise are the results?

Up to 8 significant digits, using exact defined factors rather than rounded ones. That is plenty for cooking, travel, DIY and schoolwork.

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Interactive version: https://toollantern.win/length-converter/