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Resistor Color Code Calculator
A Resistor Color Code Calculator is a tool that helps you decode the value, tolerance, and sometimes the temperature coefficient of a resistor based on the colored bands printed on it. Resistors use a standardized color-coding system to indicate their electrical resistance in ohms (Ω) and their accuracy (tolerance).
How Resistor Color Codes Work:
Resistors typically have 3, 4, 5, or 6 color bands:
3-band resistor: Two digits and a multiplier, no tolerance band.
4-band resistor: Two digits, a multiplier, and a tolerance band.
5-band resistor: Three digits, a multiplier, and a tolerance band (higher precision).
6-band resistor: Three digits, a multiplier, tolerance, and a temperature coefficient band.
Standard Resistor Color Chart:
| Color | Digit | Multiplier | Tolerance | Temperature Coefficient (ppm/°C) |
|---|---|---|---|---|
| Black | 0 | 10010^0 | — | — |
| Brown | 1 | 10110^1 | ±1% | 100 |
| Red | 2 | 10210^2 | ±2% | 50 |
| Orange | 3 | 10310^3 | — | 15 |
| Yellow | 4 | 10410^4 | — | 25 |
| Green | 5 | 10510^5 | ±0.5% | — |
| Blue | 6 | 10610^6 | ±0.25% | 10 |
| Violet | 7 | 10710^7 | ±0.1% | 5 |
| Gray | 8 | 10810^8 | ±0.05% | — |
| White | 9 | 10910^9 | — | — |
| Gold | — | 10−110^{-1} | ±5% | — |
| Silver | — | 10−210^{-2} | ±10% | — |
How to Read a 4-Band Resistor:
Let's say you have a resistor with the following color bands:
Red, Violet, Orange, Gold
Red (2) → 1st digit
Violet (7) → 2nd digit
Orange (1000) → Multiplier
Gold (±5%) → Tolerance
Why Use a Calculator:
Instead of manually looking up each band's meaning, a Resistor Color Code Calculator lets you pick the colors and instantly shows the resistance value, tolerance, and sometimes the temperature coefficient. These tools are especially helpful in electronics when you're working with a lot of resistors and need fast, accurate readings.