What is the Parallel Resistor Calculator?
The parallel resistor calculator is a free online tool that helps you work out parallel resistor quickly and accurately. It uses the standard formula Series: R = sum. Parallel: 1/R = sum(1/Ri) and shows the result instantly as you type, along with a full breakdown so you can see exactly how the answer was reached.
How to use this calculator
- Enter resistor values separated by commas.
- Choose series or parallel.
- See the equivalent resistance.
Formula used
Series: R = sum. Parallel: 1/R = sum(1/Ri)Explanation of each input
- Resistor values ohm (comma separated) โ the resistor values ohm (comma separated) used in the calculation.
- Configuration โ the configuration used in the calculation.
Understanding your result
- Equivalent resistance โ the calculated equivalent resistance in ohm.
Step-by-step calculation
For the example values 100,220,330 parallel:
- Apply the formula:
Series: R = sum. Parallel: 1/R = sum(1/Ri) - Substitute the values: 1/R = 1/100+1/220+1/330
- Result: about 56.6 ohm
Worked example
| Inputs | 100,220,330 parallel |
|---|---|
| Working | 1/R = 1/100+1/220+1/330 |
| Result | about 56.6 ohm |
Benefits and practical uses
This calculator saves you time and reduces errors when you need parallel resistor. It is useful for students, professionals and anyone who wants a fast, reliable answer without manual calculation. Results update instantly, work in your browser and can be copied or shared in one click.
Assumptions and limitations
- Ideal resistors.
Frequently asked questions
Series vs parallel?
Series resistances add up; parallel resistances combine to less than the smallest.
Disclaimer: Results are provided for general information. Please verify important figures independently.