Printable Circular Mil and K Chart
This one-page Letter PDF is for electricians, technicians, and anyone checking wire size data for voltage drop work. It lists conductor size, circular mils, and approximate area in mm² for common wires such as 14 AWG, 12 AWG, and 10 AWG. It also shows K values of about 12.9 for copper and 21.2 for aluminum in ohm-cmil/ft.
Free printable · PDF
- 1 page
- US Letter — choose “Fit to page” for A4
- PDF, 98 KB
Free for personal, family and classroom use.
Use the chart to compare conductor area values, look up circular mils quickly, and reference K factors during voltage drop calculations. It works well as a desk sheet, jobsite reference, or insert in a wire sizing workbook.
Good for
- Check conductor size in circular mils
- Compare copper and aluminum K factors
- Support voltage drop wire sizing
3 files · XLSX, PDF
Get every sheet: Voltage Drop & Wire Sizing Workbook
This sheet plus 2 more in one download, with the editable Excel files. Excel voltage drop workbook for single- and three-phase circuits with automatic wire size check, a printable circular mil and K-factor chart, and a feeder and branch circuit schedule.
$5.00 USD, one-time 3 files · about $1.67 each
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Printable Voltage Drop Workbook
Printable Circuit Schedule