Voltage Divider Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserBasic
Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter the input voltage and two resistors.
- Press Calculate.
How it works
Output = input × R2 ÷ (R1 + R2). Two resistors split a voltage in proportion to their values.
Worked example
12 V, R1 1k, R2 2k. = 8 V.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.