Pick the tab for the value you don't know. Enter the other three, and optionally include a load resistor (RL) if your output feeds a real load. Formula: Vout = Vin × R2 ÷ (R1 + R2)

Once you have R1 and R2, identify the physical resistors by their bands with the Resistor Color Code Decoder →
Solved for Vout
Vout
—
volts
Copy
Vin
—
volts
R1
—
R2
—
Current (I)
—
mA
Power R1
—
mW
Power R2
—
mW
Total Power
—
mW

Results assume ideal resistors at room temperature. Actual circuit behavior varies with resistor tolerance, temperature, and connected load.

Real resistors are only manufactured in standard E-series values. Here are the closest available matches to your calculated R1 and R2.

ComponentCalculatedNearest E12Nearest E24
R1———
R2———
Power Dissipation
Vout vs. Standard R2 Values