Free tool

Voltage Divider Calculator

Enter the total voltage and the resistor values in the chain. The calculator distributes the voltage across each section and gives you a reading ready to validate your circuit.

Tools

Calculate the voltage drop across each resistor in the divider

Add as many resistors as you need, choose their units and get the output voltage on each one from a single workspace.

Voltage Divider Calculator

Work with a total input voltage and a chain of resistors in series. The output shows the voltage drop across each resistor.

Introduce un voltaje total valido y al menos una resistencia mayor que cero.
Summary--The total resistance and the voltage distributed across each section will be shown.

Formula and usage guidance

A classic voltage divider uses resistors in series. Each resistor receives a fraction of the total voltage proportional to its value.

Main relation
  • Rtotal = R1 + R2 + ... + Rn
  • Vn = Vtotal x (Rn / Rtotal)
What to check
  • Que todas las resistencias esten en serie, no en paralelo.
  • Que el consumo de la carga no altere el divisor ideal.
  • Que la suma de caidas encaje con la tension de entrada.

Quick guide

How to interpret a voltage divider when validating a circuit

A voltage divider distributes the total voltage according to the relative weight of each resistor. It is very useful for analogue inputs, level references, sensor scaling or quick prototype checks.

Lectura rapida

  • La resistencia total es la suma de todos los tramos en serie.
  • La caida de tension aumenta cuanto mayor es la resistencia concreta.
  • Si conectas una carga a la salida, el valor real puede desviarse del ideal.
  • Conviene revisar siempre unidades y escalas antes de comparar resultados.

Resistive sum

The total resistance sets the relative distribution across the chain.

Rtotal = R1 + R2 + ... + Rn

Voltage on each section

Each resistor receives a fraction of the input voltage.

Vn = Vtotal x (Rn / Rtotal)

More tools

More useful electronics calculators

If you are reviewing components or sizing a circuit, here are other related tools so you can keep working without leaving the RobotUNO environment.

Resistor calculatorIdentify color bands and calculate series or parallel equivalents. Ohm's law calculatorCalculate voltage, current and resistance in one place. Voltage divider calculatorGet the output voltage when sizing resistors in series. Current divider calculatorCheck how current splits across parallel branches. Series and parallel capacitor calculatorCalculate equivalent capacitance with a clearer interface. Op-amp gain calculatorSize the feedback network for inverting and non-inverting configurations. 555 timer calculatorCalculate charge and discharge times for NE555 designs. RC/RL filter bandwidth calculatorCheck cutoff frequency or bandwidth for the selected filter.

FAQ

Frequently asked questions

A short guide for the most common questions when you size or review a resistive voltage divider.

What does this tool calculate?

It calculates the voltage drop across each resistor in a series chain from the applied total voltage.

Can I add several resistors?

Yes. You can build a chain with as many resistors as you need and the tool will distribute the voltage across all of them.

Does it work if a load is connected?

As an initial reference, yes, but the ideal result changes when the load modifies the total impedance seen at the output.

Is the calculator free?

Yes. You can use it online without registration or downloads.

Next step

Need help with the electronic design of your project?

If you are developing a product and need support with electronics, PCBs, firmware or technical validation, we can review your case and point you in the right direction.

Go to contact View services