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.
Millimeter to Inches Conversion
Hole Sizes of
Gemstone Beads
*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.
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.
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
|
|
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 |
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 |