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Home Fabricated Metal Calculators & Formulas

To calculate the length of Wire required for a Bangle: Add the thickness of the wire you are using to the Inside Diameter, then multiply by Pi (3.1416)

Example:

63mm I.D from 3.0mm Round Wire
63 (the I.D) + 3 (the wire thickness)
66.0 x 3.1416 = 207.35mm therefore length required is approximately 210mm

Calculator:
Inside Diameter (mm) Wire Thicknes (mm) Pi Length of Wire Required (mm)
+ x 3.1416 =

To convert from one alloy to another divide weight by the known alloy density and then multiply by wanted alloy density.

Example:

A ring weighing 3.0 grams in Stg wanted in 18ct Yellow.
3 / 10.4 x 15.5 = 4.5 grams

Calculator:
Weight (grams) Known Alloy Density Wanted Alloy Density Weight (grams)
/ x =

use our ALLOY DENSITY TABLE

Plate Area - Weight

LENGTH(mm) x WEIGHT(mm) x THICKNESS(mm) x ALLOYS DENSITY / 1000

Example:

Stg Silver Plate

100mm x 120mm x0.8mm
100 x 120 x 0.8x 10.4 / 1000 = 99.84 grams

Calculator:
Length (mm) Width (mm) Thickness (mm) Alloys Density Plate Area Weight
x x x / 1000 =

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