LED Circuit Simulator
Design and test LED circuits instantly in your browser — no installation, no account required. VoltForge simulates real current flow, resistor values, and voltage drops so you can see exactly how your LED circuit behaves before building it.
How an LED circuit works
An LED requires a current-limiting resistor in series to avoid burning out. Choose your battery voltage, LED forward voltage, and desired current — VoltForge calculates the correct resistor value and shows live current through the circuit as you adjust components.
Try it now
Open the simulator below with a pre-built LED circuit ready to edit, or start from a blank canvas.