A Resistor Color Code Calculator Is a Tool That Allows You to Select the Coloured Bands on a Resistor and Quickly See Its Resistance Value, Tolerance, and Temperature Coefficient.
Formula:
\(Resistance = Significant\ Digits \times Multiplier\)Example: Brown‑Black‑Red → 10 × 100 = 1 000 Ω
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Resistor Color Code Chart
| Color | Digit | Multiplier (Ω) | Tolerance (%) |
|---|---|---|---|
| Black | 0 | 1 | — |
| Brown | 1 | 10 | ±1 |
| Red | 2 | 100 | ±2 |
| Orange | 3 | 1,000 | — |
| Yellow | 4 | 10,000 | — |
| Green | 5 | 100,000 | ±0.5 |
| Blue | 6 | 1,000,000 | ±0.25 |
| Violet | 7 | 10,000,000 | ±0.1 |
| Gray | 8 | 100,000,000 | ±0.05 |
| White | 9 | 1,000,000,000 | — |
| Gold | — | 0.1 | ±5 |
| Silver | — | 0.01 | ±10 |
| None | — | — | ±20 |
Resistance Calculation Formula
\(Resistance = (Digits) \times (Multiplier)\)Examples:
- 4-band: Red–Violet–Yellow–Gold → 27×10,000=270,000 Ω=270 kΩ27 \times 10,000 = 270,000 \, \Omega = 270 \, k\Omega27×10,000=270,000Ω=270kΩ ±5%
- 5-band: Brown–Black–Red–Red–Brown → 102×100=10,200 Ω=10.2 kΩ102 \times 100 = 10,200 \, \Omega = 10.2 \, k\Omega102×100=10,200Ω=10.2kΩ ±1%
4-Band vs 5-Band Resistor Color Code
4‑band resistor uses 2 significant digits + multiplier + tolerance.
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Formula:
\(Resistance = (1\text{st digit} \times 10 + 2\text{nd digit}) \times \text{multiplier}\)5‑band resistor uses 3 significant digits + multiplier + tolerance
Formula:
\(Resistance = (1^\text{st} \times 100 + 2^\text{nd} \times 10 + 3^\text{rd}) \times \text{Multiplier}\)6-Band Resistor Color Code Calculator
A 6‑band resistor has six color bands:
- The first three bands = the significant digits.
- The fourth band = the multiplier.
- The fifth band = tolerance (how much the value can vary).
- The sixth band = temperature coefficient (how much resistance changes with temperature, in ppm/°C).
Example: Brown‑Black‑Orange‑Red‑Gold‑Brown →
- Digits = 1‑0‑3
- Multiplier = ×100
- Tolerance = ±5%
- Tempco = 100 ppm/°C
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FAQs about Resistor Color Code Calculator
What is a resistor color code calculator?
A tool where you choose resistor band colours and it shows the resistance value, tolerance and sometimes temperature coefficient.
How do I read resistor color bands?
Hold the band cluster away from the tolerance band, read left‑to‐right, and map each colour to a digit or multiplier via a chart.
What’s the difference between 4‑band and 5‑band codes?
4‑band: two significant digits + multiplier + tolerance. 5‑band: three digits + multiplier + tolerance (for higher precision).
How do I find tolerance from color bands?
Look at the colour of the tolerance band (commonly gold = ±5%, silver = ±10%, etc).
How does a 6‑band resistor calculator work?
It uses three digits + multiplier + tolerance + temperature coefficient band to give a full precision value and TCR.
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