Voltage Divider Calculator
Calculate voltage division in resistor circuits. Find output voltage, resistor values, current flow, and power dissipation.
Circuit Diagram
Vin (+)
│
[R1]
│
├──── Vout
│
[R2]
│
GND (-)
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Calculate Voltage Division in Resistor Circuits
A voltage divider is one of the most fundamental circuits in electronics. This calculator helps you determine output voltage, find required resistor values, and analyze current and power characteristics.
Understanding Voltage Dividers
A voltage divider uses two resistors in series to produce an output voltage that is a fraction of the input voltage. The output is taken from the junction between the resistors. This simple circuit is used in sensor interfaces, reference voltages, and signal conditioning.
Voltage Divider Formula
V_{out} = V_{in} × R₂ / (R₁ + R₂)Why Use This Calculator?
Multiple Calculation Modes
Calculate Vout, R1, or R2 based on your known values.
Complete Circuit Analysis
Get current flow and power dissipation for each resistor.
Visual Circuit Diagram
See the circuit configuration and understand component placement.
How to Use
Common Applications
Sensor Interfaces
Scale sensor signals to match ADC input ranges.
Reference Voltages
Create stable reference voltages for comparators.
Level Shifting
Interface between different voltage logic levels.
Potentiometer Analysis
Understand how variable resistors affect voltage.
Frequently Asked Questions
Yes! An unloaded voltage divider provides the calculated voltage. Adding a load draws current and reduces the output. For light loads, use lower resistance values or add a buffer amplifier.