Ground pour on PCB in PCB Design - Cell-by-Cell Formula Trace

Sample Data

This data represents PCB copper pour areas for different nets and their copper thickness. Resistance is to be calculated for the ground pour (GND) based on area and thickness.

Cell	Value
A1	Net Name
B1	Area (mm²)
C1	Copper Thickness (µm)
D1	Resistance (mΩ)
A2	GND
B2	1000
C2	35
D2
A3	VCC
B3	500
C3	35
D3

Formula Trace

= (0.017 * 0.035) / 1000

Step 1: 0.017 * 0.035

Step 2: 0.000595 / 1000

Cell Reference Map

    A       B       C       D
1 |Net Name|Area   |Thickness|Resistance
2 |GND     |1000   |35       | 
3 |VCC     |500    |35       | 

Arrows: Resistance D2 depends on B2 (Area) and C2 (Thickness)

Resistance calculation for ground pour uses Area from B2 and Thickness from C2.

Result

    A       B       C       D
1 |Net Name|Area   |Thickness|Resistance
2 |GND     |1000   |35       |0.000000595
3 |VCC     |500    |35       | 

Resistance for GND calculated and shown in D2.

The resistance for the ground pour net GND is calculated and displayed in cell D2.

Sheet Trace Quiz - 3 Questions

What does the value 0.017 represent in the formula?

A Area in mm²

B Copper thickness in µm

C Copper resistivity in mΩ·mm

D Resistance in mΩ

Key Result

Resistance = (Copper Resistivity × Thickness) / Area