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1 . Size Info

Inches to Millimeters
InchesMillimeters
1/16 in.1.5mm
1/8 in.3mm
1/4 in6mm
3/8 in9mm
1/2 in12mm
5/8 in15mm
3/4 in18.5mm
7/8 in22mm
1 in25mm
Inches & Millimeters Comparison
JewelryResource
JewelryResource
Please note that this is a close approximation. Screen resolution and monitor size will affect how you view the chart.
How Many Beads Per Inch
Bead SizePer Inch7"16"24"32"36"
3mm8.2557132200265288
4mm6.2543100150200225
5mm5.003582124160180
6mm4.252867100132153
7mm3.50245785114126
8mm3.25225075100112
10mm2.501840608090
12mm2.001533506672
14mm1.751329435663
16mm1.501125385054
18mm1.251023344550
20mm1.20820293843
Please note that it allows for the length of your clasp. If you use spacer beads or mix sizes, this chart may not be accurate.
Wire Gauge to Inches and Millimeters Conversion Chart
GaugeInchesMillimeters
100.1022.59
110.0912.31
120.0812.06
130.0721.83
140.0641.63
150.0571.45
160.0521.32
170.0451.14
180.041.02
190.0360.91
200.0320.81
210.0280.71
220.0250.64
230.0230.58
240.020.51
250.01790.455
260.01590.404
270.01420.361
280.01260.32
290.01130.287
300.010.25
310.00890.226
320.0080.2
330.00710.18
340.00630.16
350.00560.142
360.0050.13
370.00450.114
380.0040.1
Internationnal Ring Size Conversion Chart
Inside circumferenceInside diameterUS SizeUK SizeJP Size
(in)ISO(mm)(in)(mm)
1.5439.10.4912.451B1号
1.6441.70.52213.262D2号
1.7444.20.55414.073F4号
1.8446.80.58614.884H7号
1.9449.30.61815.75J 1?29号
1.9950.60.63416.15 1?2K 1?210号
2.0451.90.6516.516L 1?211号
2.0752.50.65816.716 1?2M12号
2.0953.10.66616.926 1?2M 1?213号
2.1253.80.67417.126 3?4N
2.1454.40.68217.327N 1?214号
2.1755.10.6917.537 1?4O
2.1955.70.69817.737 1?2O 1?215号
2.2256.30.70617.937 3?4P
2.24570.71418.148P 1?216号
2.2757.60.72218.3478 1?4Q
2.2958.30.7318.548 1?2Q 1?217号
2.3258.90.73818.758 3?4R
2.3459.50.74618.959R 1?218号
2.3760.20.75419.159 1?4S
2.3960.80.76219.359 1?2S 1?219号
2.4261.40.7719.569 3?4T
2.4462.10.77819.7610T 1?220号
2.4762.70.78619.9610 1?4U21号
2.4963.40.79420.1710 1?2U 1?222号
2.5464.60.8120.5711V 1?223号
2.6567.20.84221.3912X 1?225号
2.7569.70.87422.213 27号
0.90623.012.8572.314Z3
※US Size applicable for US, Canada, etc.
※UK Size applicable for UK, Australia, Ireland, New Zealand,etc.
※ISO Size applicable for France,Italy,etc.

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