9/32 inch in decimal and mm
Decimal inches
0.28125 in
0.2813 in to four places
Millimetres
7.14375 mm
From the standard, the international inch, 25.4 mm exactly
The math
- A fraction is its top number divided by its bottom number: 9/32 in = 9 ÷ 32 = 0.28125 in.
- An inch is exactly 25.4 mm, so 0.28125 × 25.4 = 7.14375 mm, or 7.144 mm to three places.
- In feet, divide by 12: 0.28125 ÷ 12 = 0.023438 ft. In centimetres, divide the mm by 10: 0.714375 cm.
- The same size in finer steps: 9/32 = 18/64. A tape marked in 16ths, 32nds or 64ths shows it at those marks.
9/32 to the nearest 1/8, 1/16
A tape or rule marked more coarsely than 32ths can’t show 9/32 exactly. The nearest marks, and how far off each is (plus means the mark is bigger; a size exactly halfway goes to the bigger mark):
| Nearest | Mark | Off by (in) | Off by (mm) |
|---|---|---|---|
| 1/8 | 1/4 in | −0.03125 | −0.794 |
| 1/16 | 5/16 in | +0.03125 | +0.794 |
Drills, plywood and lumber at 9/32 in
| Drill | Size | Off by |
|---|---|---|
| 7.1 mm | 0.2795 in | −0.0438 mm |
| 7.2 mm | 0.2835 in | +0.0563 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.