Inch (in) to Millimeter (mm)

Convert Inch (in) to Millimeter (mm) instantly with our free online converter. Enter a value and get the result immediately — no signup, no ads, works entirely in your browser.

How to use Inch to Millimeter

1. Enter the value in Inch (in) in the input field.
2. The result in Millimeter (mm) is calculated instantly as you type.
3. Copy the result using the Copy button or click Clear to start over.

What is Inch to Millimeter?

FAQ

How do I convert Inch to Millimeter?

Enter the value in Inch in the input field above. The equivalent Millimeter value will be calculated automatically. Multiply the value in Inch by 25.4000 to get Millimeter.

What is the formula to convert in to mm?

1 in = 25.4000 mm. Multiply the Inch value by 25.4000 to get Millimeter.

Is this converter accurate?

Yes, this converter uses standard conversion factors and provides results to high precision. All calculations happen in your browser using JavaScript's floating-point arithmetic.