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Millimeters to Inches Conversion Chart

1 inch = 25.4mm
Size in mm
Closest equivalent in Inches
1mm
just over 1/32 of an inch
2mm
just over 1/16 of an inch
3mm
1/8 of an inch
4mm
5/32 of an inch
5mm
3/16 of an inch
6mm
1/4 of an inch
7mm
9/32 of an inch
8mm
5/16 of an inch
9mm
11/32 of an inch
10mm
3/8 of an inch
11mm
7/16 of an inch
12mm
15/32 of an inch
13mm
1/2 of an inch
14mm
9/16 of an inch
15mm
19/32 of an inch
16mm
10/16 of an inch
17mm
11/16 of an inch
18mm
23/32 of an inch
19mm
3/4 of an inch
20mm
13/16 of an inch
25mm
15/16 of an inch
34mm
1.34 inch

1mm = 1/32"
8mm = 5/16"
2mm = 1/16"
9mm = almost 3/8"
3mm = 1/8"
10mm = 5/16"
4mm = 5/32"
11mm = 7/16"
5mm = 3/16"
12mm = almost 1/2"
6mm = almost 1/4"
20mm = almost 13/16"
7mm = almost 1/4"
25mm = almost 1"
Inches to MM: (in * 25.4)
1/8" = 4mm
1/2" = 12.5mm
1/4" = 6.5mm
1" = 25.4mm
Grams to Pounds: (g * 0.002205)
1g = 0.0022 lb
5g = 0.01 lb
100g = 0.22 lb
453.6g = 1 lb
500g = 1.10 lbs
1 Kg = 2.2046 lbs

Ounces to Pounds

1oz = 0.625 lb
8 oz = 1/2 lb
16 oz= 1 lb
 

Other Measurements

1 Troy oz = 31g
1 Avoirdupois oz = 28g
Wire Gauge
Gauge
Inches
Millimeters
10
0.102
2.59
11
0.091
2.31
12
0.081
2.06
13
0.072
1.83
14
0.064
1.63
15
0.057
1.45
16
0.052
1.32
17
0.045
1.14
18
0.04
1.02
19
0.036
0.91
20
0.032
0.81
21
0.028
0.71
22
0.025
0.64
23
0.023
0.58
24
0.02
0.51
25
0.0179
0.455
26
0.0159
0.404
27
0.0142
0.361
28
0.0126
0.32
29
0.0113
0.287
30
0.01
0.25
31
0.0089
0.226
32
0.008
0.2
33
0.0071
0.18
34
0.0063
0.16
35
0.0056
0.142
36
0.005
0.13
37
0.0045
0.114
38
0.004
0.1

 

Beads Per Inch Chart
Bead Size (mm)
1"
4"
16"
20"
24"
28"
32"
3
8.46
33.8
136
170
204
237
271
4
6.35
25.4
102
127
153
178
204
5
5.08
20.32
82
102
125
143
164
6
4.23
16.9
68
84
101
118
136
7
3.62
14.4
58
70
86
101
116
8
3.17
12.68
51
64
76
89
102
10
2.54
10.16
41
51
61
71
81
12
2.11
8.44
34
42
51
59
68
14
1.81
7.24
29
36
43
50
58
16
1.58
6.32
25
32
38
44
51
18
1.41
5.64
23
28
34
39
45

How big are the bead holes?

Czech Round Beads
Bead
Hole Size (mm)
Hole Size (inches)
Max. Size Metal Wire to Use
4mm
1.03
0.04
18GA
6mm
1.05
0.04
18GA
8mm
1.05
0.045
18GA
10mm
1.31
0.051
18GA
Hemalyke
Bead
Hole Size (mm)
Hole Size (inches)
Max. Size Metal Wire to Use
2mm
0.92
0.036
20GA
3mm
0.92
0.036
20GA
4mm
0.92
0.036
20GA
6mm
0.92
0.036
20GA
8mm
0.92
0.036
20GA
10mm
1.03
0.04
18GA
12mm
1.31
0.051
16GA
shapes
0.92
0.036
20GA
Fire Polish
Bead
Hole Size (mm)
Hole Size (inches)
Max. Size Metal Wire to Use
3mm
0.92
0.036
20GA
4mm
0.92
0.036
20GA
6mm
0.92
0.036
20GA
8mm
0.92
0.036
20GA
10mm
1.03
0.04
18GA
12mm
1.7
0.067
14GA
Seed Beads
Bead
Hole Size (mm)
Hole Size (inches)
Max. Size Metal Wire to Use
Delica 11/0
0.64
0.025
22GA
Hex-2 Cut 11/0
0.65
0.025
22GA
Dyna-Mite 11/0
0.64
0.025
22GA
Ornela Czech 11/0
1.0
0.039
18GA
Rocaille 15/0
0.5
0.02
24GA
8/0
1.2
0.047
18GA
6/0
1.7
0.067
14GA
Bugle
0.82
0.032
21GA
Fringe
0.82
0.032
21GA
Square
1.5
0.059
16GA
Triangle
1.6
0.062
16GA
Bone Beads
Bead
Hole Size (mm)
Hole Size (inches)
Max. Size Metal Wire to Use
3mm
1.03
0.04
18GA
6mm
1.31
0.051
16GA
8mm
1.31
0.051
16GA
10mm
1.31
0.051
16GA
components
1.03
0.04
18GA
Pearls
Bead
Hole Size (mm)
Hole Size (inches)
Max. Size Metal Wire to Use
Natural
0.50-0.75
0.020-0.30
22GA-24GA
Glass
1.0
0.039
18GA
Swarovski® Crystal Pearls
0.9
0.035
20GA
Cane Glass
Bead
Hole Size (mm)
Hole Size (inches)
Max. Size Metal Wire to Use
All Cane Glass
0.75-3.4
0.030-0.134
14GA-22GA
Miracle Beads
Bead
Hole Size (mm)
Hole Size (inches)
Max. Size Metal Wire to Use
4mm
1.31
0.051
16GA
6mm
1.64
0.064
16GA
8mm
1.64
0.064
14GA
Wonder Beads
Bead
Hole Size (mm)
Hole Size (inches)
Max. Size Metal Wire to Use
4mm
1.0
0.039
18GA
6mm
1.0
0.039
18GA
8mm
1.0
0.039
18GA
4x4mm
1.0
0.039
18GA
5x5mm
1.0
0.039
18GA
4x7mm
1.0
0.039
18GA
Crystals (Austrian and Celestial)
Bead
Hole Size (mm)
Hole Size (inches)
Max. Size Metal Wire to Use
3mm
0.90
0.035
22GA
4mm
0.60
0.022
22GA
6mm
0.80
0.030
21GA
8mm
1.00
0.038
20GA
10mm
1.40
0.055
18GA
Gemstone Beads
Bead
Hole Size (mm)
Hole Size (inches)
Max. Size Metal Wire to Use
4mm
0.5
0.020
24GA
6mm
0.6
0.022
22GA
8mm
0.8
0.030
21GA
10mm
1.5
0.059
16GA
12mm
2.0
0.079
14GA
14mm
1.25
0.049
18GA
Chips
0.6-1.0
0.024-0.039
18GA-22GA
Nuggets
0.75-1.9
0.030-0.075
14GA-20GA

Metric Ruler for determining inches versus millimeters
(ruler shown actual size)

This is great for determining jump ring and split ring size, also bead sizes, simply by looking at the top and comparing to the bottom row.

Examples:
6mm bead------------------1/4"
12mm jump ring-----------1/2"
 


 
*Note: Bead hole sizes listed are approximate and may vary.
Number of Beads per 16 inch strand

**Please note that the number of beads listed below is an estimate only. Number of beads may vary.

 
Size
Number of Beads
Rounds
2mm
203
3mm
136
4mm
100
6mm
67
8mm
50
10mm
41
12mm
34