Calculate
Formula and method
Unloaded: Vout = Vin × R2 / (R1 + R2). Loaded: first find Reffective = R2 × RL / (R2 + RL), then replace R2 with Reffective in the divider formula.
Worked example
At 12 V with R1 = R2 = 10 kΩ, unloaded output is 6 V. A 10 kΩ load makes the lower leg 5 kΩ, so loaded output is 4 V.
Limits and safety
Assumes ideal steady resistors and a fixed source voltage. Loading is shown only when enabled. It does not model source impedance, nonlinear loads, tolerance, power, or safety.
Privacy
The calculation runs locally. Entered circuit values are not submitted to a server or included in analytics events.