Voltage Divider Calculator
Find the output voltage of a two-resistor voltage divider from the input voltage and both resistor values. Enter input voltage, resistor r1 and…
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Find the output voltage of a two-resistor voltage divider from the input voltage and both resistor values. Enter input voltage, resistor r1 and resistor r2 to see output voltage 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 (input voltage = 12 V, resistor R1 = 10,000 ohms, resistor R2 = 4,700 ohms), the results are: output voltage 3.837 V.
Quick reference: input voltage vs result
Reference table based on the example values; it is not your calculation result.
| Input voltage (V) | Output voltage |
|---|---|
| 6 | 1.918 V |
| 12 | 3.837 V |
| 24 | 7.673 V |
| 60 | 19.184 V |
| 120 | 38.367 V |
| 240 | 76.735 V |
Frequently asked questions
What formula does this calculator use?
Output voltage = vin × r2 ÷ (r1+r2). Variables: vin = input voltage in V, r1 = resistor r1 in ohms, r2 = resistor r2 in ohms.
What do I need to enter?
You need input voltage (V), resistor r1 (ohms), resistor r2 (ohms). Results update as you type.
What is an example result?
With the default inputs (input voltage = 12 V, resistor R1 = 10,000 ohms, resistor R2 = 4,700 ohms), the results are: output voltage 3.837 V.
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