Ohm's Law Resistance Calculator
Find the resistance of a component from the voltage across it and the current flowing using R = V ÷ I. Enter voltage and current to see resistance…
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Find the resistance of a component from the voltage across it and the current flowing using R = V ÷ I. Enter voltage and current to see 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 (voltage = 12 V, current = 3 A), the results are: resistance 4.000 ohms.
Quick reference: voltage vs result
Reference table based on the example values; it is not your calculation result.
| Voltage (V) | Resistance |
|---|---|
| 6 | 2.000 ohms |
| 12 | 4.000 ohms |
| 24 | 8.000 ohms |
| 60 | 20.000 ohms |
| 120 | 40.000 ohms |
| 240 | 80.000 ohms |
Frequently asked questions
What formula does this calculator use?
Resistance = v ÷ i. Variables: v = voltage in V, i = current in A.
What do I need to enter?
You need voltage (V), current (A). Results update as you type.
What is an example result?
With the default inputs (voltage = 12 V, current = 3 A), the results are: resistance 4.000 ohms.
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