No. 15 of 19

Millimeters to inches

Small parts such as drill bits, bolts and jewelry are often sized in millimeters on one side of the Atlantic and in fractions of an inch on the other. Type millimeters to get both forms.

⇄ Inches to cm
Result–
Nearest fraction (1/64)–
Centimeters–

Key: / jumps to the first field

Results are for information only.

Millimeters to inches chart

Millimeters to inches chart 1
MillimetersInches1/64
1 mm0.0394 in3/64
2 mm0.0787 in5/64
3 mm0.1181 in1/8
4 mm0.1575 in5/32
5 mm0.1969 in13/64
6 mm0.2362 in15/64
7 mm0.2756 in9/32
8 mm0.315 in5/16
9 mm0.3543 in23/64
10 mm0.3937 in25/64
11 mm0.4331 in7/16
12 mm0.4724 in15/32
13 mm0.5118 in33/64
Millimeters to inches chart 2
MillimetersInches1/64
14 mm0.5512 in35/64
15 mm0.5906 in19/32
16 mm0.6299 in5/8
17 mm0.6693 in43/64
18 mm0.7087 in45/64
19 mm0.748 in3/4
20 mm0.7874 in25/32
21 mm0.8268 in53/64
22 mm0.8661 in55/64
23 mm0.9055 in29/32
24 mm0.9449 in15/16
25 mm0.9843 in63/64
30 mm1.1811 in1 3/16
Millimeters to inches chart 3
MillimetersInches1/64
35 mm1.378 in1 3/8
40 mm1.5748 in1 37/64
45 mm1.7717 in1 49/64
50 mm1.9685 in1 31/32
55 mm2.1654 in2 11/64
60 mm2.3622 in2 23/64
65 mm2.5591 in2 9/16
70 mm2.7559 in2 3/4
75 mm2.9528 in2 61/64
80 mm3.1496 in3 5/32
85 mm3.3465 in3 11/32
90 mm3.5433 in3 35/64
95 mm3.7402 in3 47/64
Millimeters to inches chart 4
MillimetersInches1/64
100 mm3.937 in3 15/16

Popular conversions

All conversions →

How to use it

  1. Type the size in millimeters.
  2. Read the decimal inches and the nearest 1/16, 1/32 or 1/64 fraction.
  3. Check the chart for common sizes from 1 to 100 mm.

Frequently asked questions

How many inches is 1 mm?

1 mm = 0.03937 in, or about 1/25 of an inch.

Is 6 mm the same as 1/4 inch?

Close but not equal: 1/4 in is 6.35 mm. For bolts and drill bits, use the exact size the part requires.

Why do fractions go down to 1/64?

Drill bit sets and machinist rulers are marked in 1/64 in, so the finest fraction helps when matching parts.