How to Use the Resistor Color Code Calculator

How to Use the Online Calculator

The Resistor Color Code Calculator is designed to instantly compute the resistance value for 4, 5, and 6-band resistors.

1. Select the Band Count: Choose whether you have a 4, 5, or 6-band resistor.
2. Input Colors: Select the specific color found on your resistor for each column (Band 1, Band 2, Multiplier, Tolerance, etc.).
3. Get Result: The calculator will display the resistance value (Ohms, $k\Omega$, $M\Omega$) and the tolerance percentage immediately.

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Understanding Resistor Color Codes

Resistors use a standardized color-coding system to indicate their resistance value, tolerance, and sometimes reliability or temperature coefficient. This is necessary because the components are often too small for printed text.

How to Read the Bands

To read a resistor manually, hold it so the band closest to one end is on the left. The gap between bands is usually wider before the tolerance band (the last band on the right).

• Band 1 & 2 (and 3 for 5/6-band): Represents the significant digits (0-9).
• Multiplier Band: Represents the decimal multiplier (how many zeros to add).
• Tolerance Band: Represents the accuracy of the resistor (e.g., $\pm 5\%$).
• Temperature Coefficient (6-band only): Indicates how the resistance changes with temperature.

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Resistor Color Code Chart

Use this table to decode the colors on your resistor:

Color	Significant Digits	Multiplier	Tolerance	Temp. Coefficient
Black	0	1 ($10^0$)	-	250 ppm/K
Brown	1	10 ($10^1$)	$\pm 1\%$ (F)

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Band Configurations Explained

4-Band Resistors

This is the most common type.

• Band 1 & 2: First two digits of the value.
• Band 3: Multiplier.
• Band 4: Tolerance.

5-Band Resistors

Used for higher precision (1% or 2% tolerance).

• Band 1, 2, & 3: First three digits of the value.
• Band 4: Multiplier.
• Band 5: Tolerance.

6-Band Resistors

High-precision resistors used in temperature-sensitive environments.

• Band 1, 2, & 3: First three digits.
• Band 4: Multiplier.
• Band 5: Tolerance.
• Band 6: Temperature Coefficient (PPM/°C).

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Calculation Examples

1. 10k Ohm Resistor (4-Band)

• Colors: Brown - Black - Orange - Red
• Calculation:
  • Brown (1)
  • Black (0)
  • Orange ($x1,000$ Multiplier)
  • Red ($\pm 2\%$ Tolerance)
• Result: $10 \times 1,000 = 10,000 \Omega$ or

2. 100 Ohm Resistor (4-Band)

• Colors: Brown - Black - Brown - Gold
• Calculation:
  • Brown (1)
  • Black (0)
  • Brown ($x10$ Multiplier)
  • Gold ($\pm 5\%$ Tolerance)
• Result: $10 \times 10 = 100 \Omega$ $\pm 5\%$

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Quick Reference: Common Resistor Color Codes

Resistance	4-Band Code (5% Tolerance)	5-Band Code (1% Tolerance)
1 $\Omega$	Brown - Black - Gold - Gold	Brown - Black - Black - Silver - Brown
10 $\Omega$	Brown - Black - Black - Gold	Brown - Black - Black - Gold - Brown
100 $\Omega$	Brown - Black - Brown - Gold	Brown - Black - Black - Black - Brown
1 k$\Omega$	Brown - Black - Red - Gold	Brown - Black - Black - Brown - Brown
10 k

Standard Resistor Series (E-Series)

Resistors are manufactured in standard logarithmic values known as E-Series to verify component tolerance and reduce inventory complexity.

• E3, E6, E12: Most common for general electronics (tolerances $\ge 5\%$).
• E24, E48, E96: High precision values (tolerances $\le 2\%$).