Voltage Divider Calculator
Compute Vout from Vin, R1, R2 (no-load & with load), divider current, and resistor power. Or invert to solve for R1 or R2 from a desired Vout.
Results
What Is a Voltage Divider?
A voltage divider is a simple yet powerful circuit used to scale down voltage from a power source. It consists of two resistors connected in series, where the output voltage is taken from the junction between them. Engineers use it to obtain reference voltages or reduce signal levels in electronic designs.
The online voltage divider calculator helps you quickly determine Vout, R1, or R2 based on your input voltage and resistor values. It’s ideal for both learning and professional electronics design.
How to Use the Online Voltage Divider Calculator
This voltage divider calculator tool simplifies calculations that would otherwise require manual math. Follow these steps:
- Step 1 – Enter Input Voltage (Vin)
- Type in the source voltage (e.g., 12V). This represents the supply feeding the resistor network.
- Step 2 – Input Resistor Values (R1 and R2)
- Add your resistor values in ohms. The calculator uses these to compute the output voltage according to Ohm’s Law.
- Step 3 – Optional Load Resistance (RL)
- You can include a load resistor if your circuit has one. The calculator will automatically account for load effects, showing the adjusted Vout.
- Step 4 – Click “Calculate”
- Hit the Calculate button or press Enter to instantly get the results, including:
- Vout (Output Voltage)
- Divider Current
- Power Dissipation
Practical Applications of Voltage Dividers
Voltage dividers are used across countless electronics applications:
- Sensor interfacing: Scale down analog signals for microcontrollers.
- Reference voltage generation: Create stable bias voltages for amplifiers.
- Battery monitoring: Measure voltage levels safely.
- Audio electronics: Adjust signal amplitude.
This tool saves time by eliminating manual calculations and ensuring accuracy in circuit design.
Benefits of Using This Calculator
Using the online voltage divider calculator offers several advantages:
- Instant, accurate results
- Handles both no-load and load conditions
- Free and browser-based – no software needed
- Ideal for students, engineers, and hobbyists
FAQ – Voltage Divider Calculator
A voltage divider reduces an input voltage to a lower level based on resistor ratios.
It provides precise mathematical results, assuming ideal resistors and steady DC voltage.
This version is for DC voltage. For AC circuits, impedance and phase shifts must be considered.
The calculator assumes no load and computes a standard divider output.
Yes, simply input values in ohms, kilo-ohms, or mega-ohms with proper notation.
Conclusion
The online voltage divider calculator is a powerful, free, and intuitive tool for anyone working with electronics. It eliminates the need for manual math and gives you instant, precise voltage output results. Whether you’re designing a microcontroller circuit or testing resistor combinations, this calculator ensures accuracy every time. Try it now and streamline your circuit design process!
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