1 ohm resistor color code

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

Color bands

4 bands, ±5%Brown, Black, Gold, Gold

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

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

Open 1 Ω in the color code calculator →

Actual value by tolerance

Tolerance	Band	Minimum	Maximum
±1%	Brown	990 mΩ	1.01 Ω
±2%	Red	980 mΩ	1.02 Ω
±5%	Gold	950 mΩ	1.05 Ω
±10%	Silver	900 mΩ	1.1 Ω

SMD and printed codes

SMD, 3 digits	`1R0`
SMD, 4 digits	`1R00`
SMD, EIA-96	`01Y`
Letter code (IEC 60062)	`1R0`

Current and power at common voltages

Voltage	Current	Power	Resistor rating
3.3 V	3.3 A	10.9 W	over 10 W
5 V	5 A	25 W	over 10 W
9 V	9 A	81 W	over 10 W
12 V	12 A	144 W	over 10 W
24 V	24 A	576 W	over 10 W

As an LED resistor

Current through one LED in series with 1 Ω:

Supply	Red LED (2.0 V)	White or blue LED (3.2 V)
3.3 V	1300 mA	100 mA
5 V	3000 mA	1800 mA
12 V	10000 mA	8800 mA

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

LED Resistor Calculator →

Standard series

1 Ω is a standard value in the E6, E12, E24, E48, E96 series, so it comes in almost every resistor kit.

Nearby values

1.2 Ω →

Same first two colors, different multiplier:

10 Ω 100 Ω 1 kΩ 10 kΩ 100 kΩ 1 MΩ 10 MΩ

Frequently asked questions

What are the colors of a 1 Ω resistor?

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

What is the SMD code for 1 Ω?

1R0 on 3-digit resistors and 1R00 on 4-digit (1%) resistors.

How much current flows through a 1 Ω resistor at 5 V?

5 A, dissipating 25 W: more than a standard resistor can handle.

Which resistors get mixed up with 1 Ω?

brown, black, silver, gold is 100 mΩ and brown, black, black, gold is 10 Ω: only the third band changes, so check it carefully.