18 Ohm Resistor Color Code: brown, grey, black, gold

18 ohm resistor color code

The color code for 18 Ω is brown, grey, black, gold on a 4-band resistor (±5%) and brown, grey, black, gold, brown on a 5-band resistor (±1%).

Color bands

4 bands, ±5%Brown, Grey, Black, Gold

5 bands, ±1%Brown, Grey, Black, Gold, Brown

6 bands, ±1%, 100 ppm/KBrown, Grey, Black, Gold, Brown, Brown

Open 18 Ω in the color code calculator →

Actual value by tolerance

Tolerance	Band	Minimum	Maximum
±1%	Brown	17.82 Ω	18.18 Ω
±2%	Red	17.64 Ω	18.36 Ω
±5%	Gold	17.1 Ω	18.9 Ω
±10%	Silver	16.2 Ω	19.8 Ω

SMD and printed codes

SMD, 3 digits	`180`
SMD, 4 digits	`18R0`
SMD, EIA-96	not used for this value
Letter code (IEC 60062)	`18R`

Current and power at common voltages

Voltage	Current	Power	Resistor rating
3.3 V	183 mA	605 mW	2 W
5 V	278 mA	1.39 W	3 W
9 V	500 mA	4.5 W	10 W
12 V	667 mA	8 W	over 10 W
24 V	1.33 A	32 W	over 10 W

As an LED resistor

Current through one LED in series with 18 Ω:

Supply	Red LED (2.0 V)	White or blue LED (3.2 V)
3.3 V	72.2 mA	5.56 mA
5 V	167 mA	100 mA
12 V	556 mA	489 mA

Above 20 mA: too much for a common 5 mm LED.

LED Resistor Calculator →

Standard series

18 Ω is a standard value in the E12, E24 series, so it comes in almost every resistor kit.

Nearby values

← 15 Ω 22 Ω →

Same first two colors, different multiplier:

1.8 Ω 180 Ω 1.8 kΩ 18 kΩ 180 kΩ 1.8 MΩ

Frequently asked questions

What are the colors of a 18 Ω resistor?

On a 4-band resistor: brown, grey, black, gold. On a 5-band resistor: brown, grey, black, gold, brown.

What is the SMD code for 18 Ω?

180 on 3-digit resistors and 18R0 on 4-digit (1%) resistors.

How much current flows through a 18 Ω resistor at 5 V?

278 mA, dissipating 1.39 W. A 3 W resistor is enough.

Which resistors get mixed up with 18 Ω?

brown, grey, gold, gold is 1.8 Ω and brown, grey, brown, gold is 180 Ω: only the third band changes, so check it carefully.