Inches to Millimeters

Convert Inches to Millimeters

"Inches to Millimeters" Calculator

How to Convert Inches to Millimeters

Inches to Millimeters Conversion Formula

To convert inches to millimeters, use this precise mathematical formula:

millimeters = inches × 25.4

Step-by-Step Guide for Inches to MM Conversion

Take your measurement in inches (in or ″)
Multiply by 25.4 (the exact number of millimeters in one inch)
Get your result in millimeters (mm)

Common Inch to Millimeter Conversions

Inches (″)	Millimeters (mm)	Common Use
0.25″	6.35 mm	Drill bit size
0.5″	12.7 mm	Socket wrench size
1″	25.4 mm	Definition of inch
2″	50.8 mm	Standard pipe diameter
6″	152.4 mm	Ruler length
12″	304.8 mm	1 foot

Practical Inches to MM Conversion Examples

Here are some real-world examples of inches to mm conversion:

Half-inch pipe: 0.5 in × 25.4 = 12.7 mm
Plywood thickness (3/4″): 0.75 in × 25.4 = 19.05 mm
Smartphone screen: 6 in × 25.4 = 152.4 mm
Laptop screen: 15 in × 25.4 = 381 mm

When You Need Inches to MM Conversion

Converting inches to millimeters is essential in:

Engineering design and technical drawings
Manufacturing and quality control processes
Hardware and fastener specifications
Medical measurements and diagnostics
Electronics and precision instruments
Jewelry making and watchmaking

Understanding Inches and Millimeters

Did you know? An inch was historically the width of an adult male's thumb, while a millimeter is one-thousandth of a meter.

The modern definition: 1 inch = 25.4 mm (exactly), established by international agreement in 1959 for precise conversion.

Last Results

2.1 Inches in mm - 2.1 in = 53.34 mm

0.1 Inches in mm - 0.1 in = 2.54 mm

1.12 Inches in mm - 1.12 in = 28.448 mm

0.045 Inches in mm - 0.045 in = 1.143 mm

0.065 Inches in mm - 0.065 in = 1.651 mm

0.05 Inches in mm - 0.05 in = 1.27 mm

0.125 Inches in mm - 0.125 in = 3.175 mm

15 Inches in mm - 15 in = 381 mm

8.25 Inches in mm - 8.25 in = 209.55 mm

0.74 Inches in mm - 0.74 in = 18.796 mm

0.15 Inches in mm - 0.15 in = 3.81 mm

0.017 Inches in mm - 0.017 in = 0.432 mm

0.19 Inches in mm - 0.19 in = 4.826 mm

0.78 Inches in mm - 0.78 in = 19.812 mm

0.49 Inches in mm - 0.49 in = 12.446 mm

0.66 Inches in mm - 0.66 in = 16.764 mm

2.25 Inches in mm - 2.25 in = 57.15 mm

1.4 Inches in mm - 1.4 in = 35.56 mm

1.39 Inches in mm - 1.39 in = 35.306 mm

1.43 Inches in mm - 1.43 in = 36.322 mm

17 Inches in mm - 17 in = 431.8 mm

6 Inches in mm - 6 in = 152.4 mm

15.75 Inches in mm - 15.75 in = 400.05 mm

0.64 Inches in mm - 0.64 in = 16.256 mm

0.18 Inches in mm - 0.18 in = 4.572 mm

20 Inches in mm - 20 in = 508 mm

1.625 Inches in mm - 1.625 in = 41.275 mm

0.015 Inches in mm - 0.015 in = 0.381 mm

0.32 Inches in mm - 0.32 in = 8.128 mm

7.64 Inches in mm - 7.64 in = 194.056 mm

2.36 Inches in mm - 2.36 in = 59.944 mm

7.375 Inches in mm - 7.375 in = 187.325 mm

1.875 Inches in mm - 1.875 in = 47.625 mm

0.23 Inches in mm - 0.23 in = 5.842 mm

3.375 Inches in mm - 3.375 in = 85.725 mm

0.12 Inches in mm - 0.12 in = 3.048 mm

6.5 Inches in mm - 6.5 in = 165.1 mm

0.55 Inches in mm - 0.55 in = 13.97 mm

1.18 Inches in mm - 1.18 in = 29.972 mm

0.79 Inches in mm - 0.79 in = 20.066 mm

0.22 Inches in mm - 0.22 in = 5.588 mm

6.3 Inches in mm - 6.3 in = 160.02 mm

0.94 Inches in mm - 0.94 in = 23.876 mm

0.93 Inches in mm - 0.93 in = 23.622 mm

0.37 Inches in mm - 0.37 in = 9.398 mm

1.97 Inches in mm - 1.97 in = 50.038 mm

0.875 Inches in mm - 0.875 in = 22.225 mm

0.71 Inches in mm - 0.71 in = 18.034 mm

0.96 Inches in mm - 0.96 in = 24.384 mm

8.5 Inches in mm - 8.5 in = 215.9 mm

0.62 Inches in mm - 0.62 in = 15.748 mm

1.45 Inches in mm - 1.45 in = 36.83 mm

0.6 Inches in mm - 0.6 in = 15.24 mm

0.21 Inches in mm - 0.21 in = 5.334 mm

7 Inches in mm - 7 in = 177.8 mm

1.125 Inches in mm - 1.125 in = 28.575 mm