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Artoo
Binary, decimal and hex converter
Board release tracker: Raspberry Pi, ESP32 and Arduino
GPIO pinout: Raspberry Pi, Pico, ESP32 and Arduino Uno
LED resistor calculator
Maker tools
Ohm’s law calculator
Resistor color code calculator
Ohm’s law calculator
Ohm’s law calculator
Voltage (V)
Current (A)
Resistance (Ω)
Power (W)
Calculate
Clear
Enter any two values. Prefixes work: 4k7 is not supported, but 4.7k, 20m (milli) and 100u (micro) are.
V = I × R and P = V × I. Results are rounded to 4 significant figures.