Trace width calculator usage in PCB Design - Cell-by-Cell Formula Trace

Sample Data

This data represents inputs for a PCB trace width calculator: current in amperes, allowed temperature rise in Celsius, copper thickness in ounces, and the output trace width in mils (thousandths of an inch).

Cell	Value
A1	Current (A)
B1	Temperature Rise (°C)
C1	Copper Thickness (oz)
D1	Trace Width (mil)
A2	3
B2	20
C2	1
D2

Formula Trace

D2 = 0.048 * (A2 ^ 0.44) * (B2 ^ 0.725) / (C2 ^ 0.725)

Step 1: A2 ^ 0.44

Step 2: B2 ^ 0.725

Step 3: C2 ^ 0.725

Step 4: 0.048 * 1.681 * 8.132 / 1

Step 5: D2 = 0.656

Cell Reference Map

    A      B      C      D
1 |Current|Temp   |Copper |Trace 
  |(A)    |Rise   |Thickness|Width 
2 |  3    |  20   |   1    |  ?   

Arrows: D2 depends on A2, B2, C2

Cells A2, B2, and C2 provide inputs for the formula calculating D2, the trace width.

Result

    A      B      C      D
1 |Current|Temp   |Copper |Trace 
  |(A)    |Rise   |Thickness|Width 
2 |  3    |  20   |   1    | 0.656

The calculated trace width in cell D2 is 0.656 mil, based on the inputs.

Sheet Trace Quiz - 3 Questions

What is the value of 3 raised to the power 0.44 in the calculation?

A 3.000

B 0.44

C 1.681

D 2.000

Key Result

Trace width = 0.048 * (Current ^ 0.44) * (Temperature Rise ^ 0.725) / (Copper Thickness ^ 0.725)