Convert inches to mm

Please provide values below to convert inch [in] to millimeter [mm].

Inch

Definition: An inch (symbol: in or ) is a unit of length in the imperial and United States customary measurement systems. One inch is equal to 25.4 millimeters or 2.54 centimeters.

Conversion Inch to Other Units:

  • 1 inch = 25.4 mm
  • 1 inch = 2.54 cm
  • 1 inch = 0.0833 feet (1/12 ft)
  • 1 inch = 0.0278 yards (1/36 yd)

Where is the Inch Used?

The inch is commonly used in the United States, Canada, and the United Kingdom for various measurements, including:

  • Screen sizes (TVs, monitors, smartphones)
  • Paper sizes (e.g., A4 paper margins)
  • Clothing and shoe sizes
  • Construction and carpentry (wood, pipes, nails)
  • Engineering and manufacturing

What Can Be Measured in Inches?

  • Heights of people (especially in the U.S.)
  • Length of small objects (pencils, books, screens)
  • Diameter of pipes, screws, and bolts
  • Waist and clothing measurements

Millimeter

Definition: A millimeter (mm) is a unit of length in the metric system, commonly used for measuring small objects and precise dimensions. It is widely used in engineering, manufacturing, science, and everyday life.

1 millimeter = 0.001 meters (m)
0.1 centimeters (cm)
1,000 micrometers (µm)
1,000,000 nanometers (nm)
0.03937 inches (in)

Conversion Millimeter to Other Units:

  • 10 mm = 1 cm
  • 100 mm = 10 cm = 0.1 m
  • 1,000 mm = 1 meter (m)
  • 25.4 mm = 1 inch

Where is a Millimeter Used?

A millimeter (mm) is a very small unit of length, commonly used in fields requiring precision. It is especially useful for measuring objects that are too small for centimeters but too large for micrometers.

  • Engineering & Manufacturing: Used for precise measurements of small components.
  • Medicine: Used in medical tools and measurements (e.g., syringe needle sizes).
  • Science & Microscopy: Helps measure small biological structures.
  • Daily Life: Used in measuring jewelry, screws, phone thickness, etc.

What Can Be Measured with a Millimeter?

1. Science & Medicine:

  • Medical tools & devices – Needle thickness, surgical instruments
  • Biology – Cell sizes (although smaller units like micrometers are more common)
  • Physics & Chemistry – Measuring wavelengths, thin films, or crystal structures

2. Engineering & Manufacturing:

  • Machinery components – Screws, bolts, nuts, gears
  • Electronics – Circuit boards, chip components, wire diameters
  • Automotive industry – Tolerances in engine parts, brake pads

3. Construction & Architecture:

  • Furniture & interior design – Cabinet gaps, door frame precision
  • Glass cutting – Window and mirror thickness
  • Flooring & tiling – Tile spacing, wood thickness

4. Daily Life Objects:

  • Paper thickness – Standard printer paper is about 0.1 mm thick
  • Credit card thickness – About 0.76 mm
  • Jewelry measurements – Ring sizes, gemstone settings
  • Hair thickness – Human hair is about 0.04–0.1 mm

5. Technology & Gadgets:

  • Smartphones & laptops – Device thickness (e.g., an iPhone is around 7 mm thick)
  • Camera lenses – Precision focus adjustments

Inch to Millimeter Conversion Table

Inch [in] Millimeter [mm]
0.01 in 0.254 mm
0.1 in 2.54 mm
1 in 25.4 mm
2 in 50.8 mm
3 in 76.2 mm
5 in 127 mm
10 in 254 mm
20 in 508 mm
50 in 1270 mm
100 in 2540 mm
1000 in 25400 mm

How to Convert Inch to Millimeter

1 in = 25.4 mm
1 mm = 0.0393700787 in

Example: convert 15 in to mm:
15 in = 15 × 25.4 mm = 381 mm

Popular Length Unit Conversions

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