5/8 inch in decimal and mm
Decimal inches
0.625 in
Millimetres
15.875 mm
From the standard, the international inch, 25.4 mm exactly
The math
- A fraction is its top number divided by its bottom number: 5/8 in = 5 ÷ 8 = 0.625 in.
- An inch is exactly 25.4 mm, so 0.625 × 25.4 = 15.875 mm.
- In feet, divide by 12: 0.625 ÷ 12 = 0.052083 ft. In centimetres, divide the mm by 10: 1.5875 cm.
- The same size in finer steps: 5/8 = 10/16 = 20/32 = 40/64. A tape marked in 16ths, 32nds or 64ths shows it at those marks.
Drills, plywood and lumber at 5/8 in
| Drill | Size | Off by |
|---|---|---|
| 15.5 mm | 0.6102 in | −0.375 mm |
| 16 mm | 0.6299 in | +0.125 mm |
Every drill is on the drill bit size chart.
Bits of this size
Sizes either side
Every size is on the fraction to decimal chart; any other size goes in the fraction to decimal calculator.