5/16 inch to decimal and mm
5/16" = 0.3125" = 7.938 mm
5/16 is the bolt size you find on lots of car parts, trailer hitches and lag screws. It's also a common pilot hole for 3/8" lag bolts.
To get the decimal, divide the top number by the bottom: 5 ÷ 16 = 0.3125. For millimeters, multiply that by 25.4, which gives 7.938 mm (about 7.9 mm if you're working with a metric ruler).
Nearby sizes in 64ths
| Fraction | Decimal (in) | Millimeters |
|---|---|---|
| 1/4" | 0.250000 | 6.350 mm |
| 17/64" | 0.265625 | 6.747 mm |
| 9/32" | 0.281250 | 7.144 mm |
| 19/64" | 0.296875 | 7.541 mm |
| 5/16" | 0.312500 | 7.938 mm |
| 21/64" | 0.328125 | 8.334 mm |
| 11/32" | 0.343750 | 8.731 mm |
| 23/64" | 0.359375 | 9.128 mm |
| 3/8" | 0.375000 | 9.525 mm |
Need a different value or want to round to 1/32 or 1/64? Use the full converter.