Resistor Color Code Calculator

Use this calculator to find out the ohm value and tolerance based on resistor color codes.

Result

Ohm Value: -

Tolerance: -

Min/Max Resistance: -

Temperature Coefficient: -

How to Use the Calculator

  1. Select the number of bands on your resistor (3, 4, 5, or 6 bands)
  2. Choose the colors matching each band on your resistor
  3. View the calculated resistance value, tolerance, and temperature coefficient instantly

Understanding Resistor Color Codes

Band Meanings

  • First Band: First significant figure
  • Second Band: Second significant figure
  • Third Band: Third significant figure (5 & 6 band) or multiplier (3 & 4 band)
  • Multiplier Band: Number of zeros to add
  • Tolerance Band: Resistance variation range
  • Temperature Coefficient: Change in resistance per degree (6 band only)

Common Applications

  • Circuit design and prototyping
  • Electronics repair and maintenance
  • Educational projects and experiments
  • Quality control and testing

Pro Tips

  • Always read resistor bands from left to right, with the tolerance band on the right
  • Gold and silver bands are typically used only as multipliers or tolerance indicators
  • For better accuracy, use 5 or 6 band resistors in precision applications
  • Temperature coefficient becomes crucial in temperature-sensitive applications

Color Code Quick Reference

Color Value Multiplier Tolerance
Black 0 ×1 -
Brown 1 ×10 ±1%
Red 2 ×100 ±2%