Advanced Resistor Calculator

Complete resistor toolkit with color code converter, value finder, and advanced calculations
Color to Value
Value to Color
Advanced Tools
Reference Chart

Resistor Color Code Calculator

Rotate View
Select band colors to see the resistance value.

Value to Color Code Converter

Enter a resistance value to see the color code.

Standard Resistor Values (E12 Series)

Click on a value to use it:

LED Resistor Calculator

Enter LED specifications to calculate current limiting resistor.

Voltage Divider Calculator

Enter voltage divider specifications to calculate R2.

Power & Current Calculator

Enter resistance and voltage to calculate power and current.

Standard Value Finder

Enter a target value to find the closest standard resistor value.

Resistor Color Code Reference

Color Digit Multiplier Tolerance Temp. Coefficient (ppm/K)
Black 0 1 Ω - -
Brown 1 10 Ω ±1% 100
Red 2 100 Ω ±2% 50
Orange 3 1 kΩ - 15
Yellow 4 10 kΩ - 25
Green 5 100 kΩ ±0.5% 20
Blue 6 1 MΩ ±0.25% 10
Violet 7 10 MΩ ±0.1% 5
Gray 8 100 MΩ ±0.05% 1
White 9 1 GΩ - -
Gold - 0.1 Ω ±5% -
Silver - 0.01 Ω ±10% -
None - - ±20% -

How to Read Resistor Color Codes

The color bands on a resistor are read from left to right, with the tolerance band (usually gold or silver) positioned on the right side.

  • 4-band resistors: First 2 bands are digits, 3rd is multiplier, 4th is tolerance
  • 5-band resistors: First 3 bands are digits, 4th is multiplier, 5th is tolerance
  • 6-band resistors: First 3 bands are digits, 4th is multiplier, 5th is tolerance, 6th is temperature coefficient

Standard Resistor Series

E12 Series (10% tolerance)

10, 12, 15, 18, 22, 27, 33, 39, 47, 56, 68, 82

E24 Series (5% tolerance)

10, 11, 12, 13, 15, 16, 18, 20, 22, 24, 27, 30, 33, 36, 39, 43, 47, 51, 56, 62, 68, 75, 82, 91

E96 Series (1% tolerance)

100, 102, 105, 107, 110, 113, 115, 118, 121, 124, 127, 130, 133, 137, 140, 143, 147, 150...