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Resistor for a red LED on 9 volts
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360 Ω
resistor for a red LED on 9 V at 20 mA (calculated 350 Ω)
Red LED on 9 V by current
| LED current | Exact resistor | Standard value |
|---|---|---|
| 5 mA | 1,400 Ω | 1,500 Ω |
| 10 mA | 700 Ω | 750 Ω |
| 15 mA | 467 Ω | 470 Ω |
| 20 mA | 350 Ω | 360 Ω |
Assumes 2.0 V forward voltage; check your LED datasheet. One LED per resistor; for several LEDs in series subtract each forward voltage from the supply.
Other LED colors on 9 V
FAQ
What resistor for a red LED on 9V?
For a red LED (about 2.0 V forward voltage) at 20 mA on 9 V: R = (9 − 2.0) ÷ 0.020 = 350 Ω. The next standard value is 360 Ω, which gives 19.4 mA.
What resistor is safe for an Arduino or breadboard with a red LED on 9V?
A 750 Ω resistor limits the current to about 9 mA - dimmer but safe and long-lived. Use 360 Ω for full brightness.
What power rating does the resistor need?
At 19.4 mA it dissipates about 136 mW, so a 1/2 W resistor is enough.
LED resistor calculator · all supply voltages · Ohm’s law
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