Voltage Divider Calculator
Calculate the output voltage of a two-resistor voltage divider from the input voltage and both resistor values (Vout = Vin × R₂ / (R₁ + R₂)).
Formula: Vout = Vin × R₂ / (R₁ + R₂)
About Voltage Divider Calculator
Voltage Divider Calculator is a free online calculator that gives you an instant, accurate result as you type. Calculate the output voltage of a two-resistor voltage divider from the input voltage and both resistor values (Vout = Vin × R₂ / (R₁ + R₂)).
The calculation uses the standard formula Vout = Vin × R₂ / (R₁ + R₂) and updates live with every change to the inputs. Everything runs client-side in your browser — fast, private, and free to use as often as you like.
Voltage dividers are one of the most common circuits in electronics, used to scale sensor signals down to a microcontroller-safe voltage.
Frequently Asked Questions
Is Voltage Divider Calculator free to use?
Yes. Voltage Divider Calculator is completely free, with no sign-up, no downloads, and no usage limits. You can use it as many times as you like on any device with a web browser.
How accurate is this calculator?
The calculator applies the standard formula (Vout = Vin × R₂ / (R₁ + R₂)) with full floating-point precision and rounds only the displayed result. For most practical purposes the results are exact.
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