Inch to Millimeter Converter

Convert inches (in) to millimeters (mm) by entering a value in inches.

Tip: For fractions, use decimals (e.g., 1/8 = 0.125)

Common Fraction to Decimal Conversions:

  • 1/8" = 0.125"
  • 1/4" = 0.25"
  • 3/8" = 0.375"
  • 1/2" = 0.5"
  • 5/8" = 0.625"
  • 3/4" = 0.75"
  • 7/8" = 0.875"

What is the Inch to Millimeter Converter?

This converter helps you convert measurements from inches to millimeters. It's particularly useful for precise measurements in engineering, construction, and manufacturing where both imperial and metric units are used.

Understanding the Conversion

Basic Formula

The formula to convert inches to millimeters is:

Millimeters = Inches × 25.4

Example Conversions

  • To convert 1 inch to millimeters:
    1 × 25.4 = 25.4 millimeters
  • To convert 0.5 inches to millimeters:
    0.5 × 25.4 = 12.7 millimeters

Common Conversions

  • 1/4 inch = 6.35 mm
  • 1/2 inch = 12.7 mm
  • 1 inch = 25.4 mm
  • 2 inches = 50.8 mm

📏 Complete Inch to MM Conversion Reference Table

Below is a comprehensive conversion table showing the equivalent millimeter values for common inch measurements, including fractional inches. This quick reference guide is perfect for engineering, manufacturing, and DIY projects. The table shows values rounded to one decimal place for practical use.

Inches Millimeters

Key Features:

  • Simple conversion from inches to millimeters
  • Support for fractional and decimal inch values
  • Accurate conversions to one decimal place
  • Complete conversion table for quick reference
  • Common fraction to decimal conversion guide

How to Use the Inch to Millimeter Converter?

  1. Enter the Length
    • Input the value in inches
    • For fractions, use the decimal equivalent (see conversion guide above)
    • You can use up to 4 decimal places for precise measurements
  2. Get Your Result
    • Click "Convert to Millimeters" to see the result
    • The result will show the equivalent length in millimeters

Real-World Applications and Examples

📏 Common Uses

Example 1: Hardware and Tools

  • Drill bit size: 3/8 inch (0.375")
  • Converted to millimeters: 9.5 mm

Example 2: Woodworking

  • Board thickness: 3/4 inch (0.75")
  • Converted to millimeters: 19.1 mm

Frequently Asked Questions (FAQ) About the Inch to Millimeter Converter

1. How do I convert fractional inches?

To convert fractional inches:

  • First convert the fraction to a decimal (use the guide above)
  • Enter the decimal value into the converter
  • Example: For 3/8", enter 0.375

2. How accurate are the conversions?

The converter provides results to one decimal place for practical use. The conversion is based on the standard where 1 inch equals exactly 25.4 millimeters.

3. Why convert from inches to millimeters?

Converting to millimeters is useful when:

  • Working with metric tools or materials
  • Following international specifications
  • Collaborating with international teams
  • Needing precise metric measurements