Printable formula sheets
Pocket references you can print or save as a PDF straight from your browser — no email, no sign-up, nothing to install. Every sheet is built from public mathematics and physics: the arithmetic relationships, not code-book data. When you need a value that lives in the code — an ampacity, a fill, a box volume — that stays in your code book, on purpose.
-
Bending multipliers & shrink
Offset multipliers and shrink per inch for the common angles, with the field rules of thumb beside them.
-
Ohm's law & power wheel
The two core laws and every rearrangement, on one page.
-
Fraction / decimal / mm chart
Every sixteenth of an inch as a decimal and in millimetres.
-
Single & three phase formulas
Power, kVA and the motor-current formula, single and three phase.
-
Trade math cheat sheet
Right triangles, area, percentages and conversions in one place.
Each sheet has a print button that opens your browser's own print dialog; choose "Save as PDF" there if you want a file. The site chrome drops away so the sheet comes out clean at pocket size.
Learn one thing a week
Now and then a new diagram, drill, or reference sheet goes up. Leave your email for a short heads-up when it does — no spam, no selling it on, one click to leave.