offlinewebtools.com — free, watermark-free browser tools that stay on your device with nothing uploading to our servers
LED Resistor Calculator
Work out the perfect series resistor to protect LEDs. Enter your supply voltage, LED forward voltage, and desired current to calculate the ideal resistor value.
What this tool does
LED Resistor Calculator helps you work out the perfect series resistor to protect LEDs. Enter your supply voltage, LED forward voltage, and desired current to calculate the ideal resistor value.
What you get
LED Resistor Calculator produces a direct output in this page and keeps all processing on your device, with nothing uploaded to our servers.
Report a bug
If this tool misbehaves, share a quick summary so we can investigate. We include the tool URL automatically—no need to copy and paste.