How do I pick resistor ratios?
Use the target Vout to back into resistor ratios, then round to the nearest standard E-series values when selecting parts.
Step-by-step walkthrough
Voltage Divider Calculator Guide
Use this companion guide beside the interactive calculator to make sure you understand the “why” behind every click. Each section includes the classroom explanation, student-friendly language, and quick practice prompts.
Before you start
Collect the data points listed below and double-check their units. Keeping an organized “givens” list is one of the fastest ways to reduce math errors and impress exam graders.
- voltage divider
- resistors
- voltage
Detailed procedure
Step 1
Enter the supply voltage and resistor values.
Step 2
Add an optional load resistance to see how it drags down the divider output.
Step 3
Review the output voltage, current through the chain, and power for each resistor.
Teaching & troubleshooting tips
Does it support potentiometers?
Treat the pot as R1 + R2 segments. Adjust each segment to model different wiper positions.