Voltage Divider Calculator

Voltage Divider Calculator

Voltage Divider Calculator

Volts (V)
Volts (V)
Click "Calculate".

A voltage divider circuit is a common circuit that converts a higher voltage to a lower one using a pair of resistors. The formula for calculating the output voltage is based on Ohm's Law and is shown below:

Voltage Divider Formula: Vout = VS * R2 / (R1 + R2)


  • VS: Source voltage, measured in volts (V)
  • R1: Resistance of the 1st resistor, measured in Ohms (Ω)
  • R2: Resistance of the 2nd resistor, measured in Ohms (Ω)
  • Vout: Output voltage, measured in volts (V)

Enter any three known values and press "Calculate" to solve for the other.

Voltage Divider Calculator

Why we use?

voltage divider calculator is a useful tool in electronics and electrical engineering for designing and analyzing circuits. The voltage divider formula is often employed in various applications, and a calculator makes it easier to perform calculations quickly and accurately. Here are some reasons why a voltage divider calculator is important:

  1. Circuit Design: When designing electronic circuits, engineers often need to set specific voltage levels at certain points. A voltage divider is a simple circuit that can be used to provide a fraction of the input voltage at its output. The calculator helps engineers determine the resistor values needed to achieve the desired voltage division.

  2. Sensor Interface: Many sensors output a voltage signal that needs to be scaled or adapted to match the input requirements of a microcontroller or other electronic components. A voltage divider is a common method for accomplishing this, and the calculator aids in selecting appropriate resistor values.

  3. Biasing Transistors: In transistor amplifier circuits, biasing is crucial for proper operation. A voltage divider is often used to establish the correct bias voltage at the transistor base. The calculator is valuable in determining the resistor values that achieve the desired bias point.

  4. Reference Voltage Generation: Voltage dividers are commonly used to generate reference voltages for various purposes in electronic circuits. The calculator helps in selecting resistor values to obtain a stable and accurate reference voltage.

  5. Battery Monitoring: In battery-powered devices, voltage dividers are employed to monitor battery voltage levels. This information can be crucial for indicating low battery conditions. The calculator facilitates the design of such monitoring circuits.

  6. Filter Circuits: In some cases, voltage dividers are used as part of filter networks to attenuate certain frequency components in a signal. The calculator aids in determining the resistor values for achieving the desired filtering effect.

  7. Education and Learning: For students and beginners in electronics, a voltage divider calculator serves as a valuable learning tool. It helps them understand the principles of voltage division and allows for quick experimentation with different resistor values.

In summary, the voltage divider calculator is an important tool in electronics for simplifying calculations and facilitating the design of circuits with specific voltage requirements. It saves time, reduces errors, and enhances the efficiency of the design process.

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