Resistor Ratio Calculator


About Resistor Ratio Calculator (Formula)

A Resistor Ratio Calculator is a tool used to calculate the ratio of resistances in a resistor network or circuit. This calculator is important for electronics engineers, technicians, and enthusiasts to determine voltage dividers, current dividers, and impedance matching in various electronic applications.

Resistor ratios are often used in voltage divider circuits, which allow the division of input voltage into smaller fractions based on the resistances of the components.

The formula for calculating the resistor ratio in a voltage divider circuit involves the resistance values of the two resistors:

Resistor Ratio = R2 / (R1 + R2)


  • Resistor Ratio is the ratio of the second resistor’s resistance to the total resistance of both resistors.
  • R1 is the resistance value of the first resistor.
  • R2 is the resistance value of the second resistor.

To use the Resistor Ratio Calculator formula, follow these steps:

  1. Measure the resistance values of both resistors (R1 and R2) in the circuit.
  2. Plug the values of R1 and R2 into the formula: Resistor Ratio = R2 / (R1 + R2).
  3. Calculate the resistor ratio. The result indicates the proportion of resistance contributed by the second resistor in the circuit.

Resistor ratios are essential for designing circuits that require specific voltage division or current distribution between components. Voltage dividers are commonly used in analog circuits and sensors to scale input signals for further processing.

Keep in mind that resistor ratios depend on the specific circuit configuration and the purpose of the voltage division.

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