Free Online Resistor Calculator

Calculate resistor values using color codes, series/parallel configurations, and conductor resistance with ease. Perfect for electronics enthusiasts, engineers, and students.

Resistor Color Code Calculator

Color Code Chart

Color1st, 2nd, 3rd BandMultiplierToleranceTemp Coefficient
black0x 1-250 ppm/K
brown1x 10±1%100 ppm/K
red2x 100±2%50 ppm/K
orange3x 1000±0.05%15 ppm/K
yellow4x 10000±0.02%25 ppm/K
green5x 100000±0.5%20 ppm/K
blue6x 1000000±0.25%10 ppm/K
violet7x 10000000±0.1%5 ppm/K
grey8x 100000000±0.01%1 ppm/K
white9x 1000000000--
gold-x 0.1±5%-
silver-x 0.01±10%-
none-x 1±20%-

Parallel Resistor Calculator

Resistors in Series Calculator

Resistance of a Conductor

Resistor Facts

  • Resistors limit current flow in circuits.
  • Color codes indicate resistance values.
  • Parallel resistors reduce total resistance.

Quick Examples