This voltage divider calculator estimates the missing parameter from input voltage, R1 R2 or output from a two resistor voltage divider. Below the form you can discover more information on this subject and the formulas employed.


Complete any of the three fields to discover the fourth value!
Input voltage:
R1:
R2:
Ouput voltage:

How does this voltage divider calculator work?

This is an electrical use tool that determines the missing parameter from input voltage, R1, R2 or output voltage from a two resistor voltage divider. All you have to do is provide three of the variables by choosing from the 4 fields and press the calculate button, it is as simple as that.

The formulas are applicable to the following circuit:

Voltage Divider

The voltage divider

This is also known as the potential divider and is basically a linear circuit with an input and output voltage. The divider usually has some components, the resistor pair and the output voltage emerges from them. The basic circuit is composed of the series of two resistors across which a voltage source is applied.

One of the most common uses is in reducing the voltage magnitude or in signal attenuation. The capacitive voltage divider is used in electric power transmission to measure high voltage. The resistor closest to input voltage is R1 and the one closest to ground is R2.

This voltage divider calculator finds the missing parameter value from a two voltage divider based on the other 3 given parameters. The equation is the designed to determine the output voltage but of course can be modeled to extract the other three elements.

Input voltage

This represents the voltage source entering the circuit and is measured in volts.

Vin = Vout * (R1 + R2) / R2

R1 - This is the first resistor in the circuit and is measured in ohms.

R1 = (Vin * R2 / Vout) - R2

R2 - This is the second resistor in the circuit, as well measured in ohms.

R2 = Vout * R1 / (Vin – Vout)

*If R2 is bigger than R1 leads to a larger output voltage.

Output voltage

This represents the value directly proportional to the input voltage and the ratio of R1 and R2, coming out of the divider circuit and is measured in volts.

Vout = Vin * R2 / (R1 + R2)

Example calculations

In the table below you can find some scenarios with the four components of the divider equation.

No

Voltage in (volts)

R1 (ohm)

R2 (ohm)

Voltage out(volts)

1

10

1500

2300

6.05

2

8

900

1500

5

3

15

727.27

2000

11

4

5.4

800

1000

3

26 Mar, 2015 | 0 comments

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