Sunday, August 29, 2010

Metric Conversion Chart for Jewelry Makers

Converting mm to inches
Some people new to gemstones and beading have never come across the metric measuring system often used in jewelry making. Even some of us who have been at it for a long time need help figuring out just how big 11mm is.
Dr Karen Meador made this chart to help with these conversions.
Conversion of Units
25.4 millimeters (mm) = 1 inch
1 millimeter is less than 1/16 inch
To Convert Inches to Millimeters: Multiply Inches x 25.4
To Convert to Millimeters to Inches: Multiply millimeters x .03937
Conversion Chart: Millimeters to Inches

Mm
Inches in Decimals
*Inches in Fractions
1mm 0.04 inches
Less than 1/16 inch

2mm 0.08 inches Greater than 1/16 inch & less than 1/8 inch
3mm 0.12 inches Greater than 1/16 inch & less than 1/8 inch
4mm 0.16 inches Greater than 1/8 and less than 3/16
5mm 0.2 inches Greater than 3/16 and less than 1/4
6mm 0.24 inches Greater than 3/16 and less than 1/4
7mm 0.28 inches Greater than ¼ and less than 5/16
8mm 0.32 inches Greater than ¼ and less than 5/16
9mm 0.35inches Greater than 5/16 and less than 3/8
10mm 0.40 inches Greater than 3/8 and less than 7/16
12mm 0.47 inches Greater than 7/16 and less than 8/16
14mm 0.55 inches Greater than ½ and less than 9/16
16mm 0.63 inches Greater than 5/8 & less than 11/16
18mm 0.71 inches Greater than 11/16 and less than 3/4
*The third column of this conversion chart is offered to help anyone who thinks more clearly using fractions than using decimals.
Approximate Number of Round Beads on a 16” Strand

2mm
3mm
4mm
6mm
8mm
10mm
12mm
203
136
100
67
50
41
34
Every inch is 25mm so times the number of inches by 25mm and you have how long the strand is in millimeters. Then divide by the width of the bead.

Note: Copied with the permission of:
Karen Meador
Dream Catcher Designs
Share this Blog Post :

No comments:

Post a Comment