Sheet 5 of 5 · Reference
Inch fraction to decimal chart
Every mark on a tape measure, from 1/64″ to 1″, in decimal inches and millimetres. The bold rows are the 1/16″ marks most tapes show.
1/64″ to 1″
| Fraction | Inches | mm |
|---|---|---|
| 1/64″ | 0.015625 | 0.397 |
| 1/32″ | 0.03125 | 0.794 |
| 3/64″ | 0.046875 | 1.191 |
| 1/16″ | 0.0625 | 1.588 |
| 5/64″ | 0.078125 | 1.984 |
| 3/32″ | 0.09375 | 2.381 |
| 7/64″ | 0.109375 | 2.778 |
| 1/8″ | 0.125 | 3.175 |
| 9/64″ | 0.140625 | 3.572 |
| 5/32″ | 0.15625 | 3.969 |
| 11/64″ | 0.171875 | 4.366 |
| 3/16″ | 0.1875 | 4.763 |
| 13/64″ | 0.203125 | 5.159 |
| 7/32″ | 0.21875 | 5.556 |
| 15/64″ | 0.234375 | 5.953 |
| 1/4″ | 0.25 | 6.350 |
| Fraction | Inches | mm |
|---|---|---|
| 17/64″ | 0.265625 | 6.747 |
| 9/32″ | 0.28125 | 7.144 |
| 19/64″ | 0.296875 | 7.541 |
| 5/16″ | 0.3125 | 7.938 |
| 21/64″ | 0.328125 | 8.334 |
| 11/32″ | 0.34375 | 8.731 |
| 23/64″ | 0.359375 | 9.128 |
| 3/8″ | 0.375 | 9.525 |
| 25/64″ | 0.390625 | 9.922 |
| 13/32″ | 0.40625 | 10.319 |
| 27/64″ | 0.421875 | 10.716 |
| 7/16″ | 0.4375 | 11.113 |
| 29/64″ | 0.453125 | 11.509 |
| 15/32″ | 0.46875 | 11.906 |
| 31/64″ | 0.484375 | 12.303 |
| 1/2″ | 0.5 | 12.700 |
| Fraction | Inches | mm |
|---|---|---|
| 33/64″ | 0.515625 | 13.097 |
| 17/32″ | 0.53125 | 13.494 |
| 35/64″ | 0.546875 | 13.891 |
| 9/16″ | 0.5625 | 14.288 |
| 37/64″ | 0.578125 | 14.684 |
| 19/32″ | 0.59375 | 15.081 |
| 39/64″ | 0.609375 | 15.478 |
| 5/8″ | 0.625 | 15.875 |
| 41/64″ | 0.640625 | 16.272 |
| 21/32″ | 0.65625 | 16.669 |
| 43/64″ | 0.671875 | 17.066 |
| 11/16″ | 0.6875 | 17.463 |
| 45/64″ | 0.703125 | 17.859 |
| 23/32″ | 0.71875 | 18.256 |
| 47/64″ | 0.734375 | 18.653 |
| 3/4″ | 0.75 | 19.050 |
| Fraction | Inches | mm |
|---|---|---|
| 49/64″ | 0.765625 | 19.447 |
| 25/32″ | 0.78125 | 19.844 |
| 51/64″ | 0.796875 | 20.241 |
| 13/16″ | 0.8125 | 20.638 |
| 53/64″ | 0.828125 | 21.034 |
| 27/32″ | 0.84375 | 21.431 |
| 55/64″ | 0.859375 | 21.828 |
| 7/8″ | 0.875 | 22.225 |
| 57/64″ | 0.890625 | 22.622 |
| 29/32″ | 0.90625 | 23.019 |
| 59/64″ | 0.921875 | 23.416 |
| 15/16″ | 0.9375 | 23.813 |
| 61/64″ | 0.953125 | 24.209 |
| 31/32″ | 0.96875 | 24.606 |
| 63/64″ | 0.984375 | 25.003 |
| 1″ | 1 | 25.400 |
Printed from cutmath.app · CutMath, the free fraction calculator for iPhone & iPad
Decimals are exact. Millimetres are rounded to 0.001 mm (1″ = 25.4 mm exactly).
Decimal to fraction
Times 16
Multiply the decimal part by 16. For 0.37″: 0.37 × 16 = 5.92.
Round it
Round to a whole number of sixteenths: 5.92 ≈ 6/16. Use 32 or 64 instead of 16 for finer work.
Reduce
Halve the top and bottom while both are even: 6/16 = 3/8″. For millimetres, divide by 25.4 first.
Decimal feet to inches
| Feet | Inches | Nearest 1/16″ |
|---|---|---|
| 0.05 ft | 0.6″ | 5/8″ |
| 0.1 ft | 1.2″ | 1 3/16″ |
| 0.15 ft | 1.8″ | 1 13/16″ |
| 0.2 ft | 2.4″ | 2 3/8″ |
| 0.25 ft | 3″ | 3″ |
| 0.3 ft | 3.6″ | 3 5/8″ |
| 0.35 ft | 4.2″ | 4 3/16″ |
| 0.4 ft | 4.8″ | 4 13/16″ |
| 0.45 ft | 5.4″ | 5 3/8″ |
| 0.5 ft | 6″ | 6″ |
| 0.55 ft | 6.6″ | 6 5/8″ |
| 0.6 ft | 7.2″ | 7 3/16″ |
| 0.65 ft | 7.8″ | 7 13/16″ |
| 0.7 ft | 8.4″ | 8 3/8″ |
| 0.75 ft | 9″ | 9″ |
| 0.8 ft | 9.6″ | 9 5/8″ |
| 0.85 ft | 10.2″ | 10 3/16″ |
| 0.9 ft | 10.8″ | 10 13/16″ |
| 0.95 ft | 11.4″ | 11 3/8″ |
Plans often give lengths in decimal feet, like 12.35 ft. Keep the 12 feet, then multiply the decimal part by 12: 0.35 × 12 = 4.2″. The table rounds that to the nearest mark you can measure, 4 3/16″, so the length is 12′ 4 3/16″.
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Questions
What is 3/8 inch as a decimal?
3/8″ is 0.375 inches, or 9.525 mm.
What is 5/16 inch as a decimal?
5/16″ is 0.3125 inches, or 7.9375 mm.
How many millimetres is 1/16 inch?
1/16″ is exactly 1.5875 mm, about 1.6 mm. One inch is exactly 25.4 mm.
What fraction of an inch is 0.625?
0.625″ is exactly 5/8″. Multiply the decimal by 16 to get sixteenths: 0.625 × 16 = 10, so 10/16, which reduces to 5/8.
How do I convert decimal feet to inches?
Multiply the decimal part by 12. For example, 0.35 ft × 12 = 4.2″. To get a tape-measure fraction, multiply the leftover decimal by 16 and round: 0.2 × 16 = 3.2, so about 4 3/16″.