Actual value by tolerance
| Tolerance | Band | Minimum | Maximum |
|---|
| ±1% | Brown | 1.782 kΩ | 1.818 kΩ |
| ±2% | Red | 1.764 kΩ | 1.836 kΩ |
| ±5% | Gold | 1.71 kΩ | 1.89 kΩ |
| ±10% | Silver | 1.62 kΩ | 1.98 kΩ |
SMD and printed codes
| SMD, 3 digits | 182 |
|---|
| SMD, 4 digits | 1801 |
|---|
| SMD, EIA-96 | not used for this value |
|---|
| Letter code (IEC 60062) | 1K8 |
|---|
Current and power at common voltages
| Voltage | Current | Power | Resistor rating |
|---|
| 3.3 V | 1.83 mA | 6.05 mW | 1/8 W |
| 5 V | 2.78 mA | 13.9 mW | 1/8 W |
| 9 V | 5 mA | 45 mW | 1/8 W |
| 12 V | 6.67 mA | 80 mW | 1/4 W |
| 24 V | 13.3 mA | 320 mW | 1 W |
As an LED resistor
Current through one LED in series with 1.8 kΩ:
| Supply | Red LED (2.0 V) | White or blue LED (3.2 V) |
|---|
| 3.3 V | 0.722 mA | 0.0556 mA |
| 5 V | 1.67 mA | 1 mA |
| 12 V | 5.56 mA | 4.89 mA |
LED Resistor Calculator →
Standard series
1.8 kΩ is a standard value in the E12, E24 series, so it comes in almost every resistor kit.
Nearby values
Same first two colors, different multiplier:
Frequently asked questions
What are the colors of a 1.8 kΩ resistor?
On a 4-band resistor: brown, grey, red, gold. On a 5-band resistor: brown, grey, black, brown, brown.
What is the SMD code for 1.8 kΩ?
182 on 3-digit resistors and 1801 on 4-digit (1%) resistors.
How much current flows through a 1.8 kΩ resistor at 5 V?
2.78 mA, dissipating 13.9 mW. A 1/8 W resistor is enough.
Which resistors get mixed up with 1.8 kΩ?
brown, grey, brown, gold is 180 Ω and brown, grey, orange, gold is 18 kΩ: only the third band changes, so check it carefully.
