Convert 1 Inch to Millimeter (1 in to mm)
Looking to convert 1 inch (in) to millimeter (mm)? This page provides the accurate result and a detailed explanation of how the conversion is done. Use this information to understand the relationship between Inch and Millimeter and how to calculate conversions manually or using online tools.

Looking to convert 1 inch (in) to millimeter (mm)? This page provides the accurate result and a detailed explanation of how the conversion is done. Use this information to understand the relationship between Inch and Millimeter and how to calculate conversions manually or using online tools.
What is Inch to Millimeter Conversion?
Inch (in) and millimeter (mm) are both units used to measure length, but they serve different purposes depending on the scale of the measurement. If you ever need to convert inch to millimeter, knowing the exact conversion formula is essential.
In to mm Conversion Formula:
One Inch is equal to 25.4 Millimeter.
Formula: 1 in = 25.4 mm
By using this conversion factor, you can easily convert any length from inch to millimeter with precision.
Convert 1 Inch to Millimeter
To convert 1 inch to millimeter, multiply the value by 25.4 since:
1 inch = 25.4 millimeter
So:
1 × 25.4 = 25.4
Result: 1 inch = 25.4 millimeter
Reverse Conversion
Need the reverse result? You can also convert millimeter back to inch by dividing 25.4:
25.4 millimeter ÷ 25.4 = 1 inch
For more, visit: Millimeter to Inch
Explore Related Conversion Tool
This page focuses specifically on converting 1 Inch to Millimeter. If you're looking to convert a different value, you can use our general conversion tool:
Frequently Asked Questions
What is 1 inch in millimeter?
1 inch is equal to 25.4 millimeter.
How do I convert inch to millimeter?
Multiply the value in inch by 25.4 to get the equivalent in millimeter.