Voltage Divider Calculator
Output voltage across a two-resistor divider.
V
Ω
Ω
Output voltage
8V
across R2
Current
4mA
Ratio
0.6667
Power in R1
16mW
ShowHide the working
- 1Vout = Vin × R2 ÷ (R1 + R2) = 12 × 2,000 ÷ 3,000 = 8 V
Formula
Vout = Vin × R2 ÷ (R1 + R2)How it works
Two resistors in series divide a voltage in proportion to their values. Output is taken across R2.
Example
12 V across 1 kΩ and 2 kΩ gives 8 V out.
About the Voltage Divider Calculator
Output voltage across a two-resistor divider. It sits in the Physics & Engineering section of NWS Calc, a free collection of calculators that run entirely in your browser. There is no signup, no paywall and no tracking — open the page, enter your numbers, get an answer.
Frequently asked questions
- Is the Voltage Divider Calculator free to use?
- Yes. Every calculator on NWS Calc is completely free, with no signup, no usage limits and no ads.
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- No. The Voltage Divider Calculator runs entirely in your browser using JavaScript. Nothing you type is uploaded, logged or stored on a server.
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- Yes. The page is fully responsive and works in any modern mobile or desktop browser — there is nothing to install.
- What else is in Physics & Engineering?
- Motion, force, energy, electricity and wave calculations. You can browse the full Physics & Engineering category for related calculators.