Ingénierie et Électronique

Free Resistor Color Code Calculator (4-Band & 5-Band)

Reading electronic component values quickly is a core skill for electrical engineers, robotics hobbyists, and circuit designers. Our free resistor color code calculator translates band colors into exact resistance values in Ohms (Ω), kilohms (kΩ), or megohms (MΩ). Support both 4 band resistor calculator and 5 band resistor code solver modes with interactive band selectors.

Resistor Color Code Calculator

Decode 4-band and 5-band resistor values, multipliers & tolerances

1st Band (Digit)

2nd Band (Digit)

Multiplier Band

Tolerance Band

Resistance Value

Resistance: 4.70 kΩ ±5%

Tolerance Range: 4.46 kΩ to 4.93 kΩ

Mathematical Formulas & Calculation Methods

4-Band Resistor Formula

Combines 2 digit bands, a multiplier band, and a tolerance band using the 4 band resistor calculator.

Resistance = (Band1 × 10 + Band2) × 10^(Multiplier) ± Tolerance%

5-Band Resistor Formula

Combines 3 digit bands, a multiplier band, and a tolerance band for precision resistors using our 5 band resistor code solver.

Resistance = (Band1 × 100 + Band2 × 10 + Band3) × 10^(Multiplier) ± Tolerance%

Tolerance Band Formula

Calculates minimum and maximum expected resistance boundaries using our resistor multiplier and tolerance finder.

Range = Resistance ± (Resistance × Tolerance / 100)

Worked Step-by-Step Examples

Example 1: Reading a 4-Band Resistor (Yellow, Violet, Red, Gold)

"Determine the resistance value of a 4-band resistor with bands: Yellow (4), Violet (7), Red (100x), Gold (±5%). <strong>how to read resistor color bands</strong>."

Steps:

Digits: Yellow (4), Violet (7) = 47.
Multiplier: Red = ×100 (10²).
Resistance = 47 × 100 = 4,700 Ω = 4.7 kΩ.
Tolerance: Gold = ±5%.

Result: 4.7 kΩ ± 5% (Range: 4,465 Ω to 4,935 Ω).

Example 2: Reading a 5-Band Precision Resistor (Brown, Black, Black, Brown, Brown)

"Determine resistance for: Brown (1), Black (0), Black (0), Brown (×10), Brown (±1%)."

Steps:

Digits: 1, 0, 0 = 100.
Multiplier: Brown = ×10.
Resistance = 100 × 10 = 1,000 Ω = 1.0 kΩ.
Tolerance: Brown = ±1%.

Result: 1.0 kΩ ± 1% precision resistor.

What is Calculateur de Resistor Color Code?

A resistor color code calculator decodes colored electronic bands printed on axial resistors into numerical resistance values.

The color code system follows international standard IEC 60062 to standardize component values across electronics manufacturing.

How to Use Calculateur de Resistor Color Code

1Select 4-band or 5-band resistor mode.
2Click the color dropdowns corresponding to each physical color band.
3View instant resistance in Ohms (Ω), kΩ, MΩ, and tolerance range.
4Copy component values for circuit schematics or breadboard assembly.

Key Features

Interactive color selector matching physical resistor bands.
Support for 4-band standard and 5-band precision resistors.
Automatic unit scaling from Ω to kΩ and MΩ.
Displays minimum and maximum resistance tolerance limits.
100% free web utility for electronics labs.

Benefits of Using Calculateur de Resistor Color Code

Prevents misreading component values and burning circuits.

Saves time for electronics students and hardware makers.

Instant visual verification without needing a multimeter.

Works offline in lab environments without internet lag.

Practical Use Cases

Electrical Engineering Students

Decode lab component values and master calculate resistor resistance ohms.

Hobbyists & Arduino Makers

Identify loose resistors for breadboard circuits.

Electronics Technicians

Verify circuit component values during troubleshooting.

Hardware Designers

Select correct resistor tolerances for PCB schematics.

Frequently Asked Questions

What is the tolerance of a gold band?

Gold represents ±5% tolerance, while silver represents ±10% tolerance using our resistor multiplier and tolerance finder.

How do I know which end of the resistor to read first?

Read from left to right starting at the band closest to a metal lead. The tolerance band (gold/silver) is separated by a wider gap at the right end.

What does kΩ and MΩ mean?

1 kΩ (kilohm) = 1,000 Ohms, and 1 MΩ (megohm) = 1,000,000 Ohms.

Is this resistor calculator free?

Yes, this resistor color code calculator is 100% free.

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