Parallel Resistors Calculator
Find the combined resistance of two resistors connected in parallel, and in series for comparison. Enter resistor 1 and resistor 2 to see parallel…
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Find the combined resistance of two resistors connected in parallel, and in series for comparison. Enter resistor 1 and resistor 2 to see parallel resistance and series resistance when you calculate.
Worked example
Example calculated from the starting values. Enter your own values and press Calculate to get your result.
With the default inputs (resistor 1 = 100 ohms, resistor 2 = 220 ohms), the results are: parallel resistance 68.750 ohms; series resistance 320.000 ohms.
Quick reference: resistor 1 vs result
Reference table based on the example values; it is not your calculation result.
| Resistor 1 (ohms) | Parallel resistance | Series resistance |
|---|---|---|
| 50 | 40.741 ohms | 270.000 ohms |
| 100 | 68.750 ohms | 320.000 ohms |
| 200 | 104.762 ohms | 420.000 ohms |
| 500 | 152.778 ohms | 720.000 ohms |
| 1,000 | 180.328 ohms | 1,220.000 ohms |
| 2,000 | 198.198 ohms | 2,220.000 ohms |
Frequently asked questions
What formula does this calculator use?
Parallel resistance = 1 ÷ (1 ÷ r1+1 ÷ r2); Series resistance = r1+r2. Variables: r1 = resistor 1 in ohms, r2 = resistor 2 in ohms.
What do I need to enter?
You need resistor 1 (ohms), resistor 2 (ohms). Results update as you type.
What is an example result?
With the default inputs (resistor 1 = 100 ohms, resistor 2 = 220 ohms), the results are: parallel resistance 68.750 ohms; series resistance 320.000 ohms.
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