100Ω and 220Ω in parallel = 68.75Ω
Worked answer for a 100Ω and a 220Ω resistor wired in parallel.
Equivalent resistance 68.75Ω 100Ω and 220Ω in parallel
| Resistor 1 (R1) | 100Ω |
| Resistor 2 (R2) | 220Ω |
| Connection mode | parallel |
| Formula | R = 1 / (1/R1 + 1/R2) |
| Equivalent resistance | 68.75Ω |
Resistors in parallel always give an equivalent resistance smaller than the smallest resistor in the group.
Different values? Add as many resistors as you like and switch between series and parallel in the interactive tool:
Open the Series / Parallel Resistor Calculator →Disclaimer: This is the ideal equivalent resistance. Real resistors have a tolerance (typically ±1% to ±5%), so the measured value will vary slightly. Confirm against your components' tolerance band when precision matters.