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Voltage Divider Calculator

Compute output voltage for two-resistor divider circuits.

Last validated: 2026-02-14

Use this free online Voltage Divider Calculator to compute output voltage from resistor pair values and input voltage. It is useful for classwork, lab checks, design screening, and engineering sanity checks where units and assumptions must stay visible. The form focuses on Vin (V), R1 (Ohm), R2 (Ohm) and returns Voltage Divider Inputs, Result, so you can move from input to answer without setting up a spreadsheet or custom script. Run one realistic example, adjust the inputs, and compare how the result changes before you copy or share it. Check units and formula assumptions carefully; for safety-critical or code-governed work, validate the result with authoritative references.

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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

  1. Enter Vin (V), R1 (Ohm), R2 (Ohm) for the voltage divider calculator, keeping units, dates, or text format consistent with the form labels.
  2. Confirm all units and known variables before running the calculation so the formula is applied consistently.
  3. Click "Run the tool" and review Voltage Divider Inputs, Result for the primary output.
  4. Verify units and assumptions, especially before using the result for design, lab, or safety-sensitive work.

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

Confidence and limitations

Formula References

Assumptions

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