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Calculate and design
Loaded voltage divider
Size a divider for the voltage you need with the actual load attached. See loading error, current and resistor dissipation.
From calculation to circuit
Enter your inputs and calculate to see selected components, achieved results and editable circuit source.
How this calculation works
R1 = (R2 || RL) × (Vin / Vtarget − 1)Nominal linear resistors and an ideal DC source. A resistive load connects OUT to ground. Power values describe dissipation, not the component rating you should buy.
Use the same tool locally
Use Kessetsu CLI 1.1.0 or newer. Add --format json for an AI agent. Install or update the CLI.
kess tool divider --vin "12V" --target "3V" --lower "10k" --load "10k" --values e24 --output divider.kess