Skip to content

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.

Favorite
Inches (fraction)
11/16 in

17.88 mm ≈ 11/16 in

Exact size 0.704 in · 11/16 in is 0.42 mm under

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 17.88 ÷ 25.4 = 0.7039 in
  2. Count the 1/16 in marks 0.7039 × 16 = 11.26 → nearest mark: 11
  3. Simplify the fraction 11/16 in = 11/16 in
Picture it

17.88 mm is 0.704 in, between marks. The nearest mark is 11/16 in (0.42 mm under).

Nearest mark Exact size

Nearby values

Millimeters Inches (fraction) Exact Centimeters
14.88 mm 9/16 in 0.59 1.49
15.88 mm 5/8 in 0.63 1.59
16.88 mm 11/16 in 0.66 1.69
17.88 mm 11/16 in 0.7 1.79
18.88 mm 3/4 in 0.74 1.89
19.88 mm 13/16 in 0.78 1.99
20.88 mm 13/16 in 0.82 2.09

Printed from rocketcalc.io/length/mm-to-inch-fractions/17.88