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Resistor Color Code Calculator

Identify resistor values by selecting color bands. Supports 4-band and 5-band resistors.

Resistor Color Code

Decode resistor color bands to values.

1 kΩ± 5%

Understanding the Resistor Color Code Calculator

Our Resistor Color Code Calculator is an essential tool for identifying the resistance value and tolerance of axial lead resistors. Easily decode 4-band and 5-band resistors using the standard international color code system.

Guide

How to use the Resistor Color Code Calculator

  • 1Select whether your resistor has '4 Bands' or '5 Bands'.
  • 2Choose the color of each band systematically from left to right using the dropdown menus.
  • 3The band colors in the dropdown menu correspond to their actual appearance on a resistor.
  • 4Instantly view the calculated resistance in Ohms (Ω), kiloohms (kΩ), or megaohms (MΩ), along with the tolerance percentage.
Applications

Common Use Cases

Electronics Prototyping: Quickly identifying resistors while building circuits on breadboards.
Circuit Repair: Determining the value of components on an existing PCB.
Inventory Management: Sorting through mixed batches of electronic components.
STEM Education: Learning the standard color code used by engineers and hobbyists worldwide.

The Maths Behind the Calculation

Value = (Significant Digits) × Multiplier

For a 4-band resistor, the first two bands represent the significant digits, the third band is the multiplier (10^n), and the fourth band is the tolerance. 5-band resistors use three digits for higher precision.

Knowledge Base

Frequently Asked Questions

How do I know which end to start from?

Usually, the tolerance band (often Gold or Silver) is thicker or spaced slightly further away from the other bands. This band should be on the right side.

What does 'Tolerance' mean?

Tolerance is the precision of the resistor. A 100Ω resistor with a 5% tolerance can measure anywhere between 95Ω and 105Ω.

Is there a mnemonic for the colors?

A common one is 'Bad Beer Rots Out Your Guts But Vodka Goes Well', representing Black, Brown, Red, Orange, Yellow, Green, Blue, Violet, Grey, White.

Regional Notice: United States

"Federal tax estimates are based on 2024 brackets. Consult a tax professional for official filing."