Ohms to Kilohms Converter (Ω to kΩ)
Convert ohms to kilohms (Ω to kΩ). See results in kilohms, megaohms, and milliohms. Essential for electronics, Arduino projects, and resistor selection.
RESISTANCE IN KILOHMS
4.70 kΩ
0.004700 MΩ
4,700,000 mΩ
0.213 mS
4,700÷1000
Ω to kΩ — Quick Reference
| Ω | kΩ | MΩ | Common Use |
|---|---|---|---|
| 1 Ω | 0.001 kΩ | 0.000001 MΩ | Current sense resistor |
| 10 Ω | 0.010 kΩ | 0.000010 MΩ | LED current limiter (low) |
| 47 Ω | 0.047 kΩ | 0.000047 MΩ | LED current limiter (5V) |
| 100 Ω | 0.100 kΩ | 0.000100 MΩ | Signal termination |
| 220 Ω | 0.220 kΩ | 0.000220 MΩ | LED series (3.3V) |
| 470 Ω | 0.470 kΩ | 0.000470 MΩ | Logic level shifter |
| 1,000 Ω | 1.0 kΩ | 0.001000 MΩ | General purpose (1kΩ) |
| 4,700 Ω | 4.7 kΩ | 0.004700 MΩ | Pull-up / pull-down (Arduino) |
| 10,000 Ω | 10.0 kΩ | 0.010000 MΩ | Pull-up (I²C bus) |
| 100,000 Ω | 100.0 kΩ | 0.100000 MΩ | Voltage divider (high-Z) |
How to Convert Ohms to Kilohms
Divide by 1,000:
Example: 4,700 Ω (common pull-up resistor)
= 4,700 ÷ 1,000 = 4.7 kΩ
Example: 10,000 Ω (I²C pull-up)
= 10,000 ÷ 1,000 = 10 kΩ
Example: 220 Ω (LED current limiter)
= 220 ÷ 1,000 = 0.22 kΩ
Remember: "Kilo" means thousand. 1 kΩ = 1,000 Ω. Schematics and datasheets often use kΩ to keep numbers small and readable. A "4.7k" resistor means 4,700 Ω.
E12 Standard Resistor Values
| Ω Value | kΩ | Color Code | Common Use |
|---|---|---|---|
| 100 Ω | 0.1 kΩ | Brown-Black-Brown | Signal termination |
| 220 Ω | 0.22 kΩ | Red-Red-Brown | LED current limiter (5V) |
| 330 Ω | 0.33 kΩ | Orange-Orange-Brown | LED series (3.3V) |
| 470 Ω | 0.47 kΩ | Yellow-Violet-Brown | Logic level shifter |
| 1,000 Ω | 1 kΩ | Brown-Black-Red | General purpose |
| 2,200 Ω | 2.2 kΩ | Red-Red-Red | Audio circuits |
| 4,700 Ω | 4.7 kΩ | Yellow-Violet-Red | Pull-up (Arduino default) |
| 10,000 Ω | 10 kΩ | Brown-Black-Orange | I²C pull-up, voltage divider |
| 47,000 Ω | 47 kΩ | Yellow-Violet-Orange | Audio tone control |
| 100,000 Ω | 100 kΩ | Brown-Black-Yellow | High-impedance input |
Common Arduino/Maker Resistor Values
| Project | Resistor (Ω) | In kΩ | Why This Value |
|---|---|---|---|
| LED on 5V Arduino | 220 Ω | 0.22 kΩ | Limits to ~15mA for standard LED |
| LED on 3.3V ESP32 | 100 Ω | 0.1 kΩ | Limits to ~13mA |
| Push button pull-down | 10,000 Ω | 10 kΩ | Prevents floating input |
| I²C pull-up (3.3V) | 4,700 Ω | 4.7 kΩ | Standard I²C specification |
| Voltage divider (sensors) | 10,000 Ω × 2 | 10 kΩ × 2 | Divides voltage by 2 |
| Piezo buzzer | 100 Ω | 0.1 kΩ | Current limiter |
| Potentiometer (volume) | 10,000 Ω | 10 kΩ | Audio taper standard |
Resistance Unit Scale
| Unit | Symbol | = How Many Ω | Typical Range |
|---|---|---|---|
| Milliohm | mΩ | 0.001 Ω | Wire & contact resistance |
| Ohm | Ω | 1 Ω | Speakers, power resistors |
| Kilohm | kΩ | 1,000 Ω | Most circuit resistors |
| Megaohm | MΩ | 1,000,000 Ω | Insulation, high-Z |
| Gigaohm | GΩ | 1,000,000,000 Ω | PCB leakage |
Ohm's Law Quick Reference
Ohm's Law relates voltage (V), current (I), and resistance (R):
Example: What current flows through a 4.7 kΩ (4,700 Ω) resistor at 5V?
I = 5V ÷ 4,700 Ω = 0.00106 A = 1.06 mA
What Is a Kiloohm (kΩ)?
Kiloohm (kΩ) = 1,000 ohms. It's the most common unit for resistors in electronic circuits. When you see "4.7k" or "10k" on a schematic, it means 4.7 kΩ (4,700 Ω) or 10 kΩ (10,000 Ω). The kilohm range (1 kΩ – 100 kΩ) covers most resistors used in Arduino, Raspberry Pi, and general electronics projects.
What Is an Ohm (Ω)?
Ohm (Ω) is the SI unit of electrical resistance. Named after Georg Simon Ohm, it measures opposition to current flow. Low-value resistors (under 1 kΩ) are typically expressed in ohms: 100 Ω, 220 Ω, 470 Ω. High-value resistors use kΩ or MΩ for readability.