Tools

The bench references I use constantly.

Quick, no-nonsense calculators and lookup tables for everyday hardware work. Free to use — bookmark whatever saves you a search.

Resistor Color Code

Decode a 4-band resistor to resistance and tolerance — and back.

Solve Vout, current, and power for a two-resistor divider.

AWG to diameter, cross-section, resistance, and current capacity.

Pitch, tap-drill, clearance holes, and hex sizes for M-series bolts.