1.8 ohm resistor color code

The color code for 1.8 Ω is brown, grey, gold, gold on a 4-band resistor (±5%) and brown, grey, black, silver, brown on a 5-band resistor (±1%).

Color bands

4 bands, ±5%Brown, Grey, Gold, Gold

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

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

Open 1.8 Ω in the color code calculator →

Actual value by tolerance

Tolerance	Band	Minimum	Maximum
±1%	Brown	1.782 Ω	1.818 Ω
±2%	Red	1.764 Ω	1.836 Ω
±5%	Gold	1.71 Ω	1.89 Ω
±10%	Silver	1.62 Ω	1.98 Ω

SMD and printed codes

SMD, 3 digits	`1R8`
SMD, 4 digits	`1R80`
SMD, EIA-96	not used for this value
Letter code (IEC 60062)	`1R8`

Current and power at common voltages

Voltage	Current	Power	Resistor rating
3.3 V	1.83 A	6.05 W	over 10 W
5 V	2.78 A	13.9 W	over 10 W
9 V	5 A	45 W	over 10 W
12 V	6.67 A	80 W	over 10 W
24 V	13.3 A	320 W	over 10 W

As an LED resistor

Current through one LED in series with 1.8 Ω:

Supply	Red LED (2.0 V)	White or blue LED (3.2 V)
3.3 V	722 mA	55.6 mA
5 V	1670 mA	1000 mA
12 V	5560 mA	4890 mA

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

LED Resistor Calculator →

Standard series

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

Nearby values

← 1.5 Ω 2.2 Ω →

Same first two colors, different multiplier:

18 Ω 180 Ω 1.8 kΩ 18 kΩ 180 kΩ 1.8 MΩ

Frequently asked questions

What are the colors of a 1.8 Ω resistor?

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

What is the SMD code for 1.8 Ω?

1R8 on 3-digit resistors and 1R80 on 4-digit (1%) resistors.

How much current flows through a 1.8 Ω resistor at 5 V?

2.78 A, dissipating 13.9 W: more than a standard resistor can handle.

Which resistors get mixed up with 1.8 Ω?

brown, grey, silver, gold is 180 mΩ and brown, grey, black, gold is 18 Ω: only the third band changes, so check it carefully.