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Millimeters to fractional inches

Convert millimeters to the nearest 1/16, 1/32 or 1/64 inch, like the marks on a tape measure, with the math shown step by step.

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Inches (fraction)
1/16 in

1 mm ≈ 1/16 in

Exact size 0.039 in · 1/16 in is 0.59 mm over

Also equals

How it works

in = mm ÷ 25.4

One inch is exactly 25.4 millimeters, so dividing by 25.4 gives inches as a decimal. To read that on a tape measure, count how many 1/16-inch marks it covers, round to the nearest mark, then simplify the fraction.

  1. Divide by 25.4 to get inches 1 ÷ 25.4 = 0.0394 in
  2. Count the 1/16 in marks 0.0394 × 16 = 0.63 → nearest mark: 1
  3. Simplify the fraction 1/16 in = 1/16 in
Picture it

1 mm is 0.039 in, between marks. The nearest mark is 1/16 in (0.59 mm over).

Nearest mark Exact size

Nearby values

Millimeters Inches (fraction) Exact Centimeters
0 mm 0 in 0 0
1 mm 1/16 in 0.04 0.1
2 mm 1/16 in 0.08 0.2
3 mm 1/8 in 0.12 0.3
4 mm 3/16 in 0.16 0.4

Printed from rocketcalc.io/length/mm-to-inch-fractions/1