Interactive Engineering Tool
Resistor Color Code Calculator
Calculate resistance, tolerance, and temperature coefficient instantly across 4, 5, and 6 band resistors with real-time visual color band rendering.
Resistance Value
1 kΩ
Tolerance: ±5%
Range: 950 Ω – 1.05 kΩ
(Supports values like 470, 1k, 4.7k, 100k, 1M)
How Color Coding Works
Resistors use standard color-coded rings to specify resistance rating and manufacturing tolerance:- Bands 1 to 2 (or 3): Significant digits of resistance.
- Multiplier Band: Decimal multiplier (power of 10).
- Tolerance Band: Maximum variance from nominal resistance.
- 6th Band: Temperature coefficient in ppm/°C (parts per million per Kelvin).
Voltage Divider Circuit
Resistors in series divide input voltage predictably:Vout = Vin × (R2 / (R1 + R2))
Example: If R1 = 10 kΩ and R2 = 10 kΩ with Vin = 5V, Vout will be exactly 2.5V.
Common Resistor Types
- Carbon Film: Affordable general-purpose resistors, typically 5% tolerance.
- Metal Film: High accuracy (1% or better), low thermal noise, ideal for precision audio/sensing.
- Wirewound: High power handling (5W+), low resistance, inductive.
- SMD (Surface Mount): Numeric code marked (e.g. 103 = 10 kΩ, 472 = 4.7 kΩ).
