PCB Trace Resistance Calculator January 24, 2006
This online web calculator finds the resistance of copper PCB traces (a.k.a. tracks) of given width, thickness, length, and temperature. It can also be used for copper bars (e.g. bus bars). Several choices of common units are available. Enter the Width and Thickness below. Optionally, enter the Temperature and Length, or just leave the default values. (To find the needed trace width based on current, see the PCB Trace Width Calculator.)
May 17, 2006 - Added (lateral) thermal resistance calculations.
January 18, 2007 - Clarified equations.
The Calculator
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Find Standard Resistor and Capacitor Values January 21, 2006
This javascript calculator finds the closest standard resistor (or capacitor) value in each of the IEA series. Use this, and get rid of that tattered old standard decade resistance table taped to your cubicle and put a nice photo there instead!
| Desired Value: |
| IEA Series | Closest Value | Error |
| E6 | ||
| E12 | ||
| E24 | ||
| E48 | ||
| E96 | ||
| E192 |
Which IEA series applies to the various component types?
- E6: most capacitors, some inductors
- E12: some capacitors, 10% resistors
- E24: 5% resistors
- E48: 2% resistors
- E96: 1% resistors
- E192: 0.5%, 0.25%, 0.1% resistors
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