Convert inch fractions to decimal, convert decimal to inch fractions, convert inches to metric measurements, convert metric measurements to inch fractions, and convert to feet automatically.

You are watching: .31 inches on a ruler

Inch fractions use denominators that are powers of 2 and go up to the 64th of an inch. That means the fraction denominators will be 2, 4, 8, 16, 32, and 64. As a result, converting a decimal to an inch fraction is not as simple as finding the nearest fraction.

Instead, it is necessary to find the nearest fraction with the denominator that is a power of 2, also known as a dyadic fraction or dyadic rational number.<1> Typical inch fractions will look something like 1/64, 1/32, 1/16, 1/8, 1/4, or 1/2. Use our feet and inches calculator to add or subtract feet and inch fractions.

Finding measurements on a ruler or tape measure can be confusing at first, but once you understand how the marks are laid out, then it is far simpler. The markings between the larger inch numbers vary in length.

The longest markings will be the quarter inch markings, i.e. the first marking is 1/4 inch, the second is 1/2 (2/4) inch, the third is 3/4 inch.

The next longest markings will be the eighth-inch markings, i.e. the first marking is 1/8 inch, the second is 3/8 inch, the third is 5/8 inch, etc.

The next longest markings will be the sixteenth-inch markings, i.e. the first marking is 1/16 inch, the second is 3/16 inch, the third is 5/16 inch, etc.

Download a free printable ruler with fraction measurements marked to help learn how to find the inch fractions for a measurement and for easy reading.

To convert inch fractions to metric measurements, use our handy length measurement conversion tools. Convert from inches to metric or imperial measurements or centimeters to inches.

See more: How Many Seconds Are In 31 Years ? How Many Seconds In 31 Years

## Inch Fraction Conversion Chart – Fraction Decimal and Metric Equivalents

See equivalent length measurements in fraction, decimal, and metric up to one inch in 1⁄64” increments. Use this to convert decimals to inches and millimeters.Inch fractions to the 1/64 of an inch and the equivalent decimal values in inches and metric values in millimetersFraction(inches)Decimal(inches)Metric(millimeters)1/64″ | 0.015625″ | 0.396875 mm |

1/32″ | 0.03125″ | 0.79375 mm |

3/64″ | 0.046875″ | 1.190625 mm |

1/16″ | 0.0625″ | 1.5875 mm |

5/64″ | 0.078125″ | 1.984375 mm |

3/32″ | 0.09375″ | 2.38125 mm |

7/64″ | 0.109375″ | 2.778125 mm |

1/8″ | 0.125″ | 3.175 mm |

9/64″ | 0.140625″ | 3.571875 mm |

5/32″ | 0.15625″ | 3.96875 mm |

11/64″ | 0.171875″ | 4.365625 mm |

3/16″ | 0.1875″ | 4.7625 mm |

13/64″ | 0.203125″ | 5.159375 mm |

7/32″ | 0.21875″ | 5.55625 mm |

15/64″ | 0.234375″ | 5.953125 mm |

1/4″ | 0.25″ | 6.35 mm |

17/64″ | 0.265625″ | 6.746875 mm |

9/32″ | 0.28125″ | 7.14375 mm |

19/64″ | 0.296875 | 7.540625 mm |

5/16″ | 0.3125″ | 7.9375 mm |

21/64″ | 0.328125″ | 8.334375 mm |

11/32″ | 0.34375″ | 8.73125 mm |

23/64″ | 0.359375″ | 9.128125 mm |

3/8″ | 0.375″ | 9.525 mm |

25/64″ | 0.390625″ | 9.921875 mm |

13/32″ | 0.40625″ | 10.31875 mm |

27/64″ | 0.421875″ | 10.715625 mm |

7/16″ | 0.4375″ | 11.1125 mm |

29/64″ | 0.453125″ | 11.509375 mm |

15/32″ | 0.46875″ | 11.90625 mm |

31/64″ | 0.484375″ | 12.303125 mm |

1/2″ | 0.5″ | 12.7 mm |

33/64″ | 0.515625″ | 13.096875 mm |

17/32″ | 0.53125″ | 13.49375 mm |

35/64″ | 0.546875″ | 13.890625 mm |

9/16″ | 0.5625″ | 14.2875 mm |

37/64″ | 0.578125″ | 14.684375 mm |

19/32″ | 0.59375″ | 15.08125 mm |

39/64″ | 0.609375″ | 15.478125 mm |

5/8″ | 0.625″ | 15.875 mm |

41/64″ | 0.640625″ | 16.271875 mm |

21/32″ | 0.65625″ | 16.66875 mm |

43/64″ | 0.671875″ | 17.065625 mm |

11/16″ | 0.6875″ | 17.4625 mm |

45/64″ | 0.703125″ | 17.859375 mm |

23/32″ | 0.71875″ | 18.25625 mm |

47/64″ | 0.734375″ | 18.653125 mm |

3/4″ | 0.75″ | 19.05 mm |

49/64″ | 0.765625″ | 19.446875 mm |

25/32″ | 0.78125″ | 19.84375 mm |

51/64″ | 0.796875″ | 20.240625 mm |

13/16″ | 0.8125″ | 20.6375 mm |

53/64″ | 0.828125″ | 21.034375 mm |

27/32″ | 0.84375″ | 21.43125 mm |

55/64″ | 0.859375″ | 21.828125 mm |

7/8″ | 0.875″ | 22.225 mm |

57/64″ | 0.890625″ | 22.621875 mm |

29/32″ | 0.90625″ | 23.01875 mm |

59/64″ | 0.921875″ | 23.415625 mm |

15/16″ | 0.9375″ | 23.8125 mm |

61/64″ | 0.953125″ | 24.209375 mm |

31/32″ | 0.96875″ | 24.60625 mm |

63/64″ | 0.984375″ | 25.003125 mm |

1″ | 1.0″ | 25.4 mm |

## References

The Free Dictionary, dyadic rational, https://encyclopedia2.thefreedictionary.com/Dyadic+rational+number### Measurement Calculatorns

Use our measurement calculators to calculate length, area, or volume of an object or space.

### Are You Planning a Trim Carpentry Project?

Get hassle-free estimates from local trim carpentry professionals and find out how much your project will cost.

Get Free Estimates

### Inch – Unit of Measurement Definititop top

Inches are a unit of measurement equal to 1/12 of a foot or 2.54 centimeters. Learn more about the usage, origin, and history of the inch.