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Voltage Divider Calculator — Compute V_out for a resistor divider. Enter V_in (V), R1 (Ω), R2 (Ω) to get an instant, accurate result.

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Vout = Vin × R2 / (R1 + R2).

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1. Enter the V_in (V).
2. Enter the R1 (Ω).
3. Enter the R2 (Ω).
4. Click Calculate to see your result instantly.

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Example: With V_in (V) = 12, R1 (Ω) = 1000, R2 (Ω) = 2000, the Voltage Divider Calculator gives Vout: 8.

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What is a voltage divider used for?

Scaling down a voltage to a lower level using two resistors in series — common for sensor and reference circuits.

Does the current draw affect the output?

This formula assumes no current is drawn from the output node — a real load will slightly lower Vout.

What inputs does the Voltage Divider Calculator need?

You'll need to provide: V_in (V), R1 (Ω), R2 (Ω). All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.

How accurate is the Voltage Divider Calculator?

The Voltage Divider Calculator applies the formula exactly as calculated — Vout = Vin × R2 / (R1 + R2). — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.

Is the Voltage Divider Calculator free to use?

Yes, the Voltage Divider Calculator is completely free, requires no signup, and runs instantly in your browser.

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The Voltage Divider Calculator uses a real, verifiable formula — Vout = Vin × R2 / (R1 + R2). — so results are accurate every time, not an approximation.