Inch Fraction Calculator
Add, subtract, multiply and divide inch fractions and convert them to decimals and millimeters, rounded to the nearest 1/2 to 1/64 inch.
Change the values and press Calculate to work out your own figures.
Type fractions of an inch with + and −.
Show the working
- Each length is converted to inches exactly, then added, subtracted, multiplied or divided
- 0.625 in, rounded to the nearest 1/16″
How to use it
Type fractions of an inch with + and −.
Lengths can be decimals, fractions or tape entries such as 12' 6 1/2" (in feet or inches). Prices are optional.
Key facts
decimal = numerator ÷ denominator; mm = inches × 25.4
Reading a tape
Most tapes mark 1/16 inch; rounding to 1/16 means the answer is within 1/32 inch of the exact value.
Every 1/64 inch
| Fraction | Decimal inches | 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″ | 1″ | 25.4 mm |
Questions
What is 5/8 inch in decimal?
0.625 in (15.875 mm).
What is 2.695 inches as a fraction?
2 11/16 inches, to the nearest 1/16.
Formulas
decimal = numerator ÷ denominator; mm = inches × 25.4
Sources
Limitations
- Material densities are typical values (the midpoint of the commonly published range); real loads vary with moisture, grading and compaction, so check with your supplier or type in their density.
- Tank results are the geometric volume; real tanks have wall thickness and fittings.