Voltage Divider Calculator

Voltage Divider Calculator

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Voltage Divider Calculator

Calculate the output voltage of a simple resistor voltage divider from the input voltage and resistor values. It is useful for study, lab preparation, engineering notes, or checking a calculation where consistent units matter.

How to use this calculator

Use the fields shown for voltage divider calculator and enter each value in the unit or format requested. Review the labels before calculating, then compare the result with a simple known case or rough estimate when one is available.

Formula

Vout = Vin Γ— Rβ‚‚ Γ· (R₁ + Rβ‚‚).

Quick check

Check the result against a rough estimate. A quick mental check can reveal a misplaced decimal or an incorrect unit. For technical or academic work, write down the units alongside the numbers. A mathematically correct calculation can still be misleading if the units are wrong.

Frequently Asked Questions FAQ

What does the Voltage Divider Calculator find?
It estimates the output voltage from an input voltage and two series resistors in the standard unloaded divider arrangement.
Which resistor belongs in the numerator?
When Vout is measured across R2, R2 is used in the numerator of the standard formula.
What is the voltage-divider formula?
Vout = Vin Γ— Rβ‚‚ Γ· (R₁ + Rβ‚‚).
What happens if R1 and R2 are swapped?
Swapping the resistors changes which resistance is measured at the output, so the calculated voltage changes.
Does a connected load change the result?
Yes. A load can change the effective resistance and reduce the output compared with the ideal unloaded-divider calculation.
How can I sanity-check the output?
With positive resistors in the simple unloaded circuit, Vout should lie between 0 V and Vin. Check the resistor units before calculating.

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