MM to Inches

If you're new working with beads or jewelry findings, the international unit of measure for them can be somewhat confusing.

We hope you find the information below helpful.

Bead Hole Sizes General Information Chart Can be Found at Bottom of this Page

The Math : Multiply the millimeter size by .03937 to get the inch equivalent.

1-inch = 25.40 millimeters

GET A PAIR OF CALIPERS -- IT'S LIKELY THE BEST INVESTMENT YOU'LL MAKE!!!

When given, all sizing information listed on the Website is average size per item, listed as overall outer dimensions.

mm to inches

visual mm to inches chart

size comparison mm to inches chart

Millimeter to Inches Conversion
1mm
1/32 Inch
 
14mm
9/16 Inch
2mm
1/16 Inch
 
15mm
Just under 5/8 Inch
3mm
3/32 Inch
 
16mm
5/8 Inch
4mm
1/8 Inch
 
17mm
Just under 11/16 Inch
5mm
3/16 Inch
 
18mm
Just under 3/4 Inch
6mm
Just under 1/4 Inch
 
19mm
Just over 3/4 Inch
7mm
Just over 1/4 Inch
 
20mm
Just under 13/16 Inch
8mm
5/16 Inch
 
21mm
Just over 13/16 Inch
9mm
Just under 3/8 Inch
 
22mm
Just under 7/8 Inch
10mm
Just over 3/8 Inch
 
23mm
Just over 7/8 Inch
11mm
7/16 Inch
 
24mm
15/16 Inch
12mm
Just under 1/2 Inch
 
25.4mm
1 Inch
13mm
Just over 1/2 Inch
     

Another mm to inches Chart
MM
Inches
 
MM
Inches
1
.0394
 
26
1.0236
2
.0787
 
27
1.0630
3
.1181
 
28
1.1024
4
.1574
 
29
1.1417
5
.1969
 
30
1.1820
6
.2362
 
31
1.2205
7
.2756
 
32
1.2598
8
.3150
 
33
1.2992
9
.3543
 
34
1.3386
10
.3937
 
35
1.3780
11
.4331
 
36
1.4173
12
.4724
 
37
1.4567
13
.5118
 
38
1.4961
14
.5512
 
39
1.5354
15
.5906
 
40
1.5748
16
.6299
 
41
1.6142
17
.6693
 
42
1.6535
18
.7087
 
43
1.6929
19
.7480
 
44
1.7323
20
.7874
 
45
1.7717
21
.8268
 
46
1.8110
22
.8661
 
47
1.8504
23
.9055
 
48
1.8898
24
.9449
 
49
1.9291
25
.9843
 
50
1.9685


B & S Gauge Conversion
( Gauge is used when measuring thickness of wire )

Gauge
MM
Thickness in Inches
8
3.25
.128
10
2.60
.102
12
2.06
.081
14
1.60
.063
16
1.30
.051
18
1.0
.039
20
0.82
.032
22
0.64
.025
24
0.50
.020


Ring Size Conversion
US/Canada
Diameter
in Inches
UK
France
Germany
Japan
Switzerland
1/2
0.462
A
--
--
--
--
1
0.487
B
--
--
1
--
1-1/2
0.563
C
--
--
--
--
2
0.520
D
41-1/2
13-1/4
2
1-1/2
2-1/2
0.536
E
42-1/8
13-1/2
--
2-3/4
3
0.553
F
44
14
4
4
3.5
0.569
G
45-1/4
14-1/2
5
5-1/4
4
0.586
H-1/2
46-1/2
15
7
6-1/2
4-1/4
0.594
I
47-1/8
15-1/4
--
7-1/8
4-3/4
0.610
J
48-3/8
--
--
8-3/8
5-1/4
0.627
K
49-5/8
16
--
9-5/8
5-3/4
0.643
L
50-7/8
--
11
10-7/8
6-1/4
0.660
M
52-1/8
16-3/4
--
12-1/8
6-3/4
0.676
N
53-3/8
--
--
13-3/8
7
0.685
O
54
17-1/4
14
14
7-1/2
0.701
P
55-1/4
17-3/4
15
15-1/4
8
0.717
Q
56-1/2
18
16
16-1/2
8-1/2
0.734
R
57-3/4
18-1/2
17
17-3/4
9
0.750
S
59
19
18
19
9-3/4
0.775
T
60-7/8
19-3/4
--
20-7/8
10-1/4
0.792
U
62-1/8
20-1/4
21
22-1/8
10-3/4
0.808
V
63-3/8
--
--
23-3/8
11-1/4
0.825
W
64-5/8
--
--
24-5/8
11-3/4
0.841
X
65-78
--
--
25-7/8
12
0.849
Y
66-1/2
21-1/4
25
26-1/2
12-1/2
0.856
Z
67-3/4
21-3/4
6
27-3/4
13
0.882
--
69
22
27
29
Hole Sizes of Gemstone Beads

Bead Size (mm)

Hole Size (mm)

2 mm

0.4 mm

4 & 5 mm 0.5 mm
6 & 7 mm 0.6 mm
8 & 9 mm 0.8 mm
10 mm 1.2 mm
12 mm 1.5 mm
14 mm 1.5 mm
*These are approximations based on gemstone beads. Actual hole sizes may vary

How to figure how many beads you will need to make a necklace...

Example :
To find out how many 6mm beads you will need to make a 16" necklace.
> 6mm=.2362 inches so 16 inches divided by .2362 inches per bead = 67.73
> You will need approximately 64 beads.
> Don't Forget, You'll want to subtract a few beads from the total above for your clasp or other type of closure.


If You have any Questions, Please Do Not Hesitate Contacting Us.
-- Michelle, DiAnna & Joe --


mm to Inch
Conversion Chart
mm Inches (approximate)
  Simple
Conversion
To the nearest
1/32 inch
Decimal
1   1/32   1/32 0.04
2   1/16   3/32 0.08
3   1/8   4/32 0.12
4   3/16   5/32 0.16
5   3/16   6/32 0.20
6   1/4   8/32 0.24
7   1/4   9/32 0.28
8   5/16  10/32 0.31
9   3/8  11/32 0.35
10   3/8  13/32 0.39
11   7/16  14/32 0.43
12   1/2  15/32 0.47
13   1/2  16/32 0.51
14   9/16  18/32 0.55
15   9/16  19/32 0.59
16  5/8  20/32 0.63
17  11/16  21/32 0.67
18  11/16  23/32 0.71
19  3/4  24/32 0.75
20  13/16  25/32 0.79
21  13/16  26/32 0.83
22  7/8  28/32 0.87
23  7/8  29/32 0.91
24  15/16  30/32 0.94
25 1       31/32 0.98
26 1 1/32 1  1/32 1.02
27 1  1/16 1  2/32 1.06
28 1  1/8 1  3/32 1.10
29 1  1/8 1  5/32 1.14
30 1  3/16 1  6/32 1.18
31 1  1/4 1  7/32 1.22
32 1  1/4 1  8/32 1.26
33 1  5/16 1 10/32 1.30
34 1  5/16 1 11/32 1.34
35 1  6/16 1 12/32 1.38
36 1  7/16 1 13/32 1.42
37 1  7/16 1 15/32 1.46
38 1  8/16 1 16/32 1.50
39 1  9/16 1 17/32 1.54
40 1  9/16 1 18/32 1.57
41 1 10/16 1 20/32 1.61
42 1 10/16 1 21/32 1.65
43 1 11/16 1 22/32 1.69
44 1 12/16 1 23/32 1.73
45 1 12/16 1 25/32 1.77
46 1 13/16 1 26/32 1.81
47 1 14/16 1 27/32 1.85
48 1 14/16 1 28/32 1.89
49 1 15/16 1 30/32 1.93
50 1 15/16 1 31/32 1.97
51 2      2      2.01