Printable Electronics Cheat Sheet
Free printable electronics cheat sheet at exact scale — Ohm's law, series/parallel resistors, capacitor and inductor formulas, the resistor colour code and SI prefixes on one page.
This electronics cheat sheet is the bench reference you keep by the soldering iron — Ohm's law and the power wheel, series and parallel resistor and capacitor formulas, RC and RL time constants, reactance and resonance, Kirchhoff's laws, the LED current-limiting resistor formula, and the full resistor colour code with digits, multipliers and tolerance bands.
It also lists the SI prefixes (p, n, µ, m, k, M, G) you use for component values. Everything prints at exact scale in real millimetres on A4, Letter or any size.
Printing at exact scale
Every sheet is drawn in real millimetres and prints at exact physical scale. For accurate output, set Scale = 100% (Actual size) and Margins = None in your browser's print dialog. Not sure your printer is honest? Run the printer ruler test first to confirm 50 mm really measures 50 mm.
Frequently asked questions
Does it include the resistor colour code?
Yes — the band digit values, multipliers and tolerance colours are all on the sheet.
What formulas are covered?
Ohm's law and power, series/parallel resistance and capacitance, RC/RL time constants, capacitive and inductive reactance, LC resonance, voltage dividers and decibels.
Is it really free?
Yes. Every template on printsheet.io is completely free, with no sign-up, no account and no watermark. Generate as many sheets as you like.
How do I get an exact-scale print?
Choose your paper size, then in the print dialog set Scale to 100% or “Actual size” and Margins to None. The sheet is defined in real millimetres, so it prints at true size. Use the calibration ruler page to verify.
Which paper sizes are supported?
A4, A5, A3, A6, US Letter, Legal and Tabloid, in portrait or landscape. Pick the size that matches the paper loaded in your printer.
Can I save it as a PDF instead of printing?
Yes — choose “Save as PDF” as the printer in your browser's print dialog. The PDF keeps the exact millimetre dimensions.