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Fraction to Decimal Inch Converter - Free Online Calculator

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Fraction to Decimal Inch Converter

Convert between fractional inches, decimal inches, and millimeters. Essential for technical drawings, woodworking, and precision measurements.

Fraction to Decimal Converter

and / inches
Decimal Inches
0.0000"
Millimeters
0.000 mm
Simplified Fraction
0"

Decimal to Fraction Converter

0"
Exact

Common Fraction Reference Chart

Fraction Decimal mm 64ths
1/64" 0.0156" 0.397 mm 1/64"
1/32" 0.0313" 0.794 mm 1/64"
3/64" 0.0469" 1.191 mm 3/64"
1/16" 0.0625" 1.587 mm 1/64"
5/64" 0.0781" 1.984 mm 5/64"
3/32" 0.0938" 2.381 mm 3/64"
7/64" 0.1094" 2.778 mm 7/64"
1/8" 0.1250" 3.175 mm 1/64"
9/64" 0.1406" 3.572 mm 9/64"
5/32" 0.1563" 3.969 mm 5/64"
11/64" 0.1719" 4.366 mm 11/64"
3/16" 0.1875" 4.762 mm 3/64"
13/64" 0.2031" 5.159 mm 13/64"
7/32" 0.2188" 5.556 mm 7/64"
15/64" 0.2344" 5.953 mm 15/64"
1/4" 0.2500" 6.350 mm 1/64"
17/64" 0.2656" 6.747 mm 17/64"
9/32" 0.2813" 7.144 mm 9/64"
19/64" 0.2969" 7.541 mm 19/64"
5/16" 0.3125" 7.938 mm 5/64"
21/64" 0.3281" 8.334 mm 21/64"
11/32" 0.3438" 8.731 mm 11/64"
23/64" 0.3594" 9.128 mm 23/64"
3/8" 0.3750" 9.525 mm 3/64"
25/64" 0.3906" 9.922 mm 25/64"
13/32" 0.4063" 10.319 mm 13/64"
27/64" 0.4219" 10.716 mm 27/64"
7/16" 0.4375" 11.112 mm 7/64"
29/64" 0.4531" 11.509 mm 29/64"
15/32" 0.4688" 11.906 mm 15/64"
31/64" 0.4844" 12.303 mm 31/64"
1/2" 0.5000" 12.700 mm 1/64"
33/64" 0.5156" 13.097 mm 33/64"
17/32" 0.5313" 13.494 mm 17/64"
35/64" 0.5469" 13.891 mm 35/64"
9/16" 0.5625" 14.287 mm 9/64"
37/64" 0.5781" 14.684 mm 37/64"
19/32" 0.5938" 15.081 mm 19/64"
39/64" 0.6094" 15.478 mm 39/64"
5/8" 0.6250" 15.875 mm 5/64"
41/64" 0.6406" 16.272 mm 41/64"
21/32" 0.6563" 16.669 mm 21/64"
43/64" 0.6719" 17.066 mm 43/64"
11/16" 0.6875" 17.462 mm 11/64"
45/64" 0.7031" 17.859 mm 45/64"
23/32" 0.7188" 18.256 mm 23/64"
47/64" 0.7344" 18.653 mm 47/64"
3/4" 0.7500" 19.050 mm 3/64"
49/64" 0.7656" 19.447 mm 49/64"
25/32" 0.7813" 19.844 mm 25/64"
51/64" 0.7969" 20.241 mm 51/64"
13/16" 0.8125" 20.637 mm 13/64"
53/64" 0.8281" 21.034 mm 53/64"
27/32" 0.8438" 21.431 mm 27/64"
55/64" 0.8594" 21.828 mm 55/64"
7/8" 0.8750" 22.225 mm 7/64"
57/64" 0.8906" 22.622 mm 57/64"
29/32" 0.9063" 23.019 mm 29/64"
59/64" 0.9219" 23.416 mm 59/64"
15/16" 0.9375" 23.813 mm 15/64"
61/64" 0.9531" 24.209 mm 61/64"
31/32" 0.9688" 24.606 mm 31/64"
63/64" 0.9844" 25.003 mm 63/64"
1" 1.0000" 25.400 mm 1/64"

Visual Inch Ruler

Click on the ruler to see measurements

How to use this calculator

๐Ÿ”ข How to Use This Calculator

  1. To convert fractions to decimals: Enter whole inches and fraction parts
  2. Use quick select buttons for common fractions
  3. To convert decimals to fractions: Enter decimal value
  4. Check the reference table for common conversions
  5. Click on the visual ruler to measure specific points

๐Ÿ“ Understanding Inch Fractions

Inches are commonly divided into fractions with denominators that are powers of 2:

  • โ€ข Halves: 1/2"
  • โ€ข Quarters: 1/4", 3/4"
  • โ€ข Eighths: 1/8", 3/8", 5/8", 7/8"
  • โ€ข Sixteenths: 1/16", 3/16", 5/16", etc.
  • โ€ข Thirty-seconds and sixty-fourths for precision work

๐ŸŒŸ Practical Applications

Woodworking

  • โ€ข Measuring lumber thickness
  • โ€ข Setting saw blade depth
  • โ€ข Drilling precise holes

Engineering

  • โ€ข Technical drawings
  • โ€ข Machine part specifications
  • โ€ข Tolerance calculations

๐Ÿ’ก Quick Reference

Common Equivalents:

  • 1/2" = 0.5000" = 12.700 mm
  • 1/4" = 0.2500" = 6.350 mm
  • 1/8" = 0.1250" = 3.175 mm
  • 1/16" = 0.0625" = 1.588 mm

Conversion Factor:

  • 1 inch = 25.4 mm (exactly)
  • To convert: multiply inches by 25.4
  • From mm: divide by 25.4

โš ๏ธ Important Notes

  • โ€ข Always simplify fractions to lowest terms
  • โ€ข Be careful with precision - more decimal places mean more accuracy
  • โ€ข In woodworking, 1/16" is often the practical limit
  • โ€ข For machining, 1/64" or decimal inches are common
  • โ€ข Remember: measuring twice prevents costly mistakes

About this calculator

Convert fractional inches to decimal inches and millimeters. Perfect for woodworking, engineering, and technical drawings.

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