PCB material and copper weight basics in PCB Design - Cell-by-Cell Formula Trace

Sample Data

This table shows common PCB materials with their copper weight in ounces and corresponding copper thickness in mils (thousandths of an inch).

Cell	Value
A1	Material
B1	Copper Weight (oz)
C1	Thickness (mils)
A2	FR4
B2	1
C2	1.4
A3	CEM-1
B3	0.5
C3	0.7
A4	Polyimide
B4	2
C4	2.8

Formula Trace

=B2 * 1.4

Step 1: B2

Step 2: 1 * 1.4

Cell Reference Map

    A       B       C
1 Material Copper  Thickness
2 FR4      1       1.4
3 CEM-1    0.5     0.7
4 Polyimide 2       2.8

Formula references B2 (Copper Weight for FR4) and multiplies by 1.4 (thickness per oz).

The formula uses the copper weight value from cell B2 and multiplies it by the thickness per ounce (1.4 mils) to calculate copper thickness.

Result

    A       B       C       D
1 Material Copper  Thickness Thickness (calculated)
2 FR4      1       1.4      1.4
3 CEM-1    0.5     0.7      
4 Polyimide 2       2.8      

The calculated copper thickness for FR4 is 1.4 mils, matching the thickness value in column C.

Sheet Trace Quiz - 3 Questions

What is the copper weight value used in the formula?

A 1.4 oz

B 1 oz

C 0.5 oz

D 2 oz

Key Result

Copper thickness = Copper weight (oz) * Thickness per ounce (mils)