Note: Enter resistance values in Ohm. Do not use kilo ohm. convert to ohm and then use.
Enter voltage values in fraction or in decimal. Do not use something like 3v3 or 5v5. Convert it to fraction and then use
Example 1: 10k ohm = 10000 ohm
Example 2: 3v3 = 3.3
How to use this calculator
Enter any three values.
Press the button “Calculate Missing Value”
Explanation of voltage divider
A voltage divider consists of two resistors connected in series across a voltage source. It divides the input voltage into two parts based on the ratio of the resistor values. The output voltage is obtained across one of the resistors.
The voltage divider formula provides a simple way to calculate the output voltage:
Vout = Vin * (R2 / (R1 + R2))where:
- Vin is the input voltage applied across the series resistors.
- R1 is the resistance value of the first resistor.
- R2 is the resistance value of the second resistor.
- Vout is the output voltage obtained across the second resistor.
Exploring Different Resistor Combinations
Voltage dividers offer flexibility in selecting resistor values to achieve specific output voltage ratios. By varying the resistor values while maintaining the same ratio, we can obtain different output voltages. Let’s explore some examples using different resistor combinations, assuming an input voltage of 5 V.
| R1 (Ω) | R2 (Ω) | Vout (V) |
|---|---|---|
| 1000 | 10000 | 0.4545 |
| 2000 | 20000 | 0.4545 |
| 5000 | 50000 | 0.4545 |
| 10000 | 100000 | 0.4545 |
As you can see, regardless of the specific resistor values, as long as the ratio R2 / (R1 + R2) remains constant, the output voltage remains the same. This property allows designers to choose different resistor combinations while maintaining the desired output voltage proportion.
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