Engineering

Voltage Divider Calculator

Compute output voltage for two-resistor divider circuits.

Last validated: 2026-02-14

Voltage Divider Calculator computes output voltage from resistor pair values and input voltage. It is useful in analog circuit prototyping and reference voltage design. The tool helps verify divider behavior before breadboarding. Use it to select resistor values for target outputs.

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Input Pattern

Enter values in the left panel, keep units explicit, run the calculation, then copy or share the result. Invalid fields are highlighted immediately.

Voltage Divider Inputs

Result

Vout: 6.000000 V

How to use this tool

Enter input voltage and resistor values R1 and R2.
Run calculation to compute output voltage.
Adjust resistor values iteratively until output matches target.

Worked Example

Auto-generated from the tool's current default or entered inputs.

Example Inputs

Vin: 12.0
R1: 10000.0
R2: 10000.0
Vout: 6.0

Expected Outputs

Vin: 12
R1: 10000
R2: 10000
Vout: 6

Interpretation

Vin is 12.0. Use this as a decision input, not as a standalone conclusion.
R1 is 10000.0. Use this as a decision input, not as a standalone conclusion.
R2 is 10000.0. Use this as a decision input, not as a standalone conclusion.
Confirm unit consistency and operational constraints before applying this result in production or field conditions.

Scenario Compare (A vs B)

Use this to compare two input sets and quantify change in key outputs.

Confidence and limitations

Outputs are deterministic formula results and depend entirely on input quality and units.
Results are for planning and learning; verify with domain standards before safety-critical use.
Use as a quick estimate only; validate against codes, tolerances, and project constraints.

Formula References

First-order engineering design formulas and unit conversions.
Results are quick estimates, not code-compliance validation.

Assumptions

Outputs are deterministic formula results and depend entirely on input quality and units.
Results are for planning and learning; verify with domain standards before safety-critical use.
Use as a quick estimate only; validate against codes, tolerances, and project constraints.

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