Ohm's Law core
Enter any two values among voltage, current, resistance, and power to calculate the remaining linked values.
Tools
Calculator Tools Included On The Homepage
The homepage keeps the original tool-first layout and preserves every calculator function from the original file.
LED resistor
Estimate a current-limiting resistor for a 5 V LED circuit.
Cable voltage drop
Estimate voltage loss and power loss in a copper cable run.
Current draw
Estimate load current from power and supply voltage.
PCB trace current
Review simplified trace current capacity using copper thickness, width, and temperature rise.
Dynamic diagrams
Canvas diagrams remain on the homepage to make calculations easier to understand.