Ohm Finder

Ohm Finder is a practical electronics toolkit for identifying resistors and solving everyday circuit calculations.

Decode 4-band, 5-band and 6-band resistors by color, including resistance, tolerance and operating range. Convert resistance values into the closest standard color bands and decode EIA-3, EIA-4, EIA-96 and R-notation SMD codes.

Use the engineering tools to calculate:

• Resistors in series and parallel
• Ohm’s law: voltage, current, resistance and power
• Voltage and current dividers
• Delta–Wye resistor conversion
• Wheatstone bridge analysis, balance and measurement
• Resistor power dissipation and a practical commercial power recommendation

Calculations are designed for quick bench work and study. Results and recent calculations remain available locally on the device, without requiring an account or an internet connection for the core tools.

Ohm Finder includes a one-time Premium purchase that unlocks advanced tools, image export, history features and an ad-free experience. Always validate calculations and operating limits before applying a result to a real circuit.