Skip to content
Woodworking Math

19/64 inch in decimal and mm

Decimal inches

0.296875 in

0.2969 in to four places

Millimetres

7.540625 mm

From the standard, the international inch, 25.4 mm exactly

The math

  1. A fraction is its top number divided by its bottom number: 19/64 in = 19 ÷ 64 = 0.296875 in.
  2. An inch is exactly 25.4 mm, so 0.296875 × 25.4 = 7.540625 mm, or 7.541 mm to three places.
  3. In feet, divide by 12: 0.296875 ÷ 12 = 0.02474 ft. In centimetres, divide the mm by 10: 0.7540625 cm.

19/64 to the nearest 1/8, 1/16, 1/32

A tape or rule marked more coarsely than 64ths can’t show 19/64 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):

NearestMarkOff by (in)Off by (mm)
1/81/4 in−0.046875−1.191
1/165/16 in+0.015625+0.397
1/325/16 in+0.015625+0.397

Drills, plywood and lumber at 19/64 in

Drills either side of 19/64 in
DrillSizeOff by
7.5 mm0.2953 in−0.0406 mm
7.6 mm0.2992 in+0.0594 mm

Every drill is on the drill bit size chart.

Bits of this size

Sizes either side

FractionDecimalmm
9/32 in0.28125 in7.144 mm
5/16 in0.3125 in7.938 mm

Every size is on the fraction to decimal chart; any other size goes in the fraction to decimal calculator.