Four-ring resistor calculator

Ring 1
Black
Brown
Red
Orange
Yellow
Green
Blue
Purple
Gray
White
Ring 2
Black
Brown
Red
Orange
Yellow
Green
Blue
Purple
Gray
White
Ring 3 multiplier
Black
Brown
Red
Orange
Yellow
Green
Blue
Purple
Gray
White
Ring 4 Error rate
Gold %5
Silver %10

Resistance: Ohm

Error±: Ohm
Gold
Silver

What is a Four-Ring Resistor Calculator?

A Four-Ring Resistor Calculator is a tool used to determine the resistance value of a 4-band resistor based on its color code. In this system, the resistor has four color bands that represent:

  1. The first digit (first band)
  2. The second digit (second band)
  3. The multiplier (third band)
  4. The tolerance (fourth band)

The color code uses specific colors to represent numbers, and the calculator translates these colors into a resistance value in ohms (Ω).

Why Use a Four-Ring Resistor Calculator?

  • Quickly calculate resistance values without manually interpreting the color code.
  • Reduce errors in reading color codes.
  • Simplify circuit design by ensuring proper resistor values.
  • Aid in troubleshooting circuits by identifying resistor values easily.

How to Use a Four-Ring Resistor Calculator?

  1. Identify the four color bands on the resistor.
  2. Enter the colors of each band into the calculator.
    • First band → First significant digit.
    • Second band → Second significant digit.
    • Third band → Multiplier (scaling factor).
    • Fourth band → Tolerance (accuracy, typically ±1%, ±5%, etc.).
  3. The calculator computes the resistance value and tolerance.

Example:

  • Red-Red-Brown-Gold → 220Ω ±5%
  • Green-Blue-Orange-Silver → 560kΩ ±10%

When to Use a Four-Ring Resistor Calculator?

  • When working with standard 4-band resistors.
  • In circuit design and electronics projects.
  • For identifying resistors in existing circuits or on PCBs.
  • When repairing or modifying circuits and needing to quickly calculate resistor values.