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Woodworking Math

29/64 inch in decimal and mm

Decimal inches

0.453125 in

0.4531 in to four places

Millimetres

11.509375 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: 29/64 in = 29 ÷ 64 = 0.453125 in.
  2. An inch is exactly 25.4 mm, so 0.453125 × 25.4 = 11.509375 mm, or 11.509 mm to three places.
  3. In feet, divide by 12: 0.453125 ÷ 12 = 0.03776 ft. In centimetres, divide the mm by 10: 1.1509375 cm.

29/64 to the nearest 1/8, 1/16, 1/32

A tape or rule marked more coarsely than 64ths can’t show 29/64 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)
1/81/2 in+0.046875+1.191
1/167/16 in−0.015625−0.397
1/3215/32 in+0.015625+0.397

Drills, plywood and lumber at 29/64 in

Drills either side of 29/64 in
DrillSizeOff by
11.5 mm0.4528 in−0.0094 mm
11.6 mm0.4567 in+0.0906 mm

Every drill is on the drill bit size chart.

Bits of this size

Sizes either side

FractionDecimalmm
7/16 in0.4375 in11.113 mm
15/32 in0.46875 in11.906 mm

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