Voltage Divider Calculator

Voltage Divider Circuit


Voltage Divider Formula


You must enter values into all 3 form fields to compute result.

VIN

R1

R2

VOUT= 0.00V


The voltage divider calculator calculates the output voltage of the voltage divider network based on the value of resistor, R1, resistor, R2, and the input voltage, VIN. This output voltage, which is the voltage that is dropped across resistor, R2, is calculated by the formula, VOUT= VIN (R2/(R1 + R1)).

According to this formula, the resistor with the greater resistance value will drop more voltage across it; and, conversely, the resistor with the smaller resistance value will drop less voltage across it.

To use this voltage divider calculator, a user must enter the value of the input voltage, VIN, the value of resistor R1, and the value of resistor, R2, and click the 'Calculate' button. The voltage output result will then be calculated and automatically displayed. The result of this output voltage is calculated in unit volts (V).

Voltage dividers are very common and used very often in circuits. Many times in circuits, different levels of voltage must be allocated to different parts of a circuit. To do this, a voltage divider circuit, such as that shown above, can be used. This can divide the input voltage that a circuit receives and allocate it accordingly and as needed to different parts of the circuit. For example, a circuit may receive 10V as input. However, one chip in the circuit may need 7 volts, while another chip in the circuit only needs 3 volts. We can allocate these voltages to the different chips by a voltage divider. If we make one resistor have a value of 3KΩ and the other resistor have a value of 7KΩ, this will allocate the 10 volts into 3V and 7V.

Example Calculation

If resistor R1 is 1KΩ and resistor R2 is 2KΩ and the input voltage, VIN is 12V, what is the output voltage, VOUT?

VOUT= VIN(R2/(R1 + R2)= (12V)(2KΩ)/(1KΩ + 2KΩ)= 8V.

So VOUT= 8 volts.

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