3 inch in decimal and mm
Decimal inches
3 in
Millimetres
76.2 mm
From the standard, the international inch, 25.4 mm exactly
The math
- A fraction is its top number divided by its bottom number: 3 in = 3 in = 3 in.
- An inch is exactly 25.4 mm, so 3 × 25.4 = 76.2 mm, or 76.200 mm to three places.
- In feet, divide by 12: 3 ÷ 12 = 0.25 ft. In centimetres, divide the mm by 10: 7.62 cm.
Drills, plywood and lumber at 3 in
| Drill | Size | Off by |
|---|---|---|
| 1 in | 1 in | −2 in |
| 25 mm | 0.9843 in | −51.2 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.