100 ohm resistor color code

The color code for 100 Ω is brown, black, brown, gold on a 4-band resistor (±5%) and brown, black, black, black, brown on a 5-band resistor (±1%).

Color bands

4 bands, ±5%Brown, Black, Brown, Gold

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

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

Open 100 Ω in the color code calculator →

Actual value by tolerance

Tolerance	Band	Minimum	Maximum
±1%	Brown	99 Ω	101 Ω
±2%	Red	98 Ω	102 Ω
±5%	Gold	95 Ω	105 Ω
±10%	Silver	90 Ω	110 Ω

SMD and printed codes

SMD, 3 digits	`101`
SMD, 4 digits	`1000`
SMD, EIA-96	`01A`
Letter code (IEC 60062)	`100R`

Current and power at common voltages

Voltage	Current	Power	Resistor rating
3.3 V	33 mA	109 mW	1/4 W
5 V	50 mA	250 mW	1/2 W
9 V	90 mA	810 mW	2 W
12 V	120 mA	1.44 W	3 W
24 V	240 mA	5.76 W	over 10 W

As an LED resistor

Current through one LED in series with 100 Ω:

Supply	Red LED (2.0 V)	White or blue LED (3.2 V)
3.3 V	13 mA	1 mA
5 V	30 mA	18 mA
12 V	100 mA	88 mA

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

LED Resistor Calculator →

Standard series

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

Nearby values

← 82 Ω 120 Ω →

Same first two colors, different multiplier:

1 Ω 10 Ω 1 kΩ 10 kΩ 100 kΩ 1 MΩ 10 MΩ

Frequently asked questions

What are the colors of a 100 Ω resistor?

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

What is the SMD code for 100 Ω?

101 on 3-digit resistors and 1000 on 4-digit (1%) resistors.

How much current flows through a 100 Ω resistor at 5 V?

50 mA, dissipating 250 mW. A 1/2 W resistor is enough.

Which resistors get mixed up with 100 Ω?

brown, black, black, gold is 10 Ω and brown, black, red, gold is 1 kΩ: only the third band changes, so check it carefully.