抵抗器カラーコード

共有リンク

はじめに

Resistor Color Code — Decode 4-band resistor color codes. Enter Band 1, Band 2, Band 3 (multiplier), Band 4 (tolerance) to get an instant, accurate result.

計算式

4-band decode: value = (digit1×10 + digit2) × 10^(multiplier band), with tolerance read from the 4th band's color.

ステップごとの説明

Enter the Band 1.
Enter the Band 2.
Enter the Band 3 (multiplier).
Enter the Band 4 (tolerance).
Click Calculate to see your result instantly.

実例

Example: With Band 1 = brown, Band 2 = black, Band 3 (multiplier) = red, Band 4 (tolerance) = gold, the Resistor Color Code gives Ohms: 1000, Tolerance Pct: 5.

よくある質問

What does the tolerance band tell me?

How much the actual resistance may vary from the labeled value — gold is ±5%, silver is ±10%.

Does this work for 5-band resistors?

No, this decodes standard 4-band resistors only.

What inputs does the Resistor Color Code need?

You'll need to provide: Band 1, Band 2, Band 3 (multiplier), Band 4 (tolerance). All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.

How accurate is the Resistor Color Code?

The Resistor Color Code applies the formula exactly as calculated — 4-band decode: value = (digit1×10 + digit2) × 10^(multiplier band), with tolerance read from the 4th band's color. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.

Is the Resistor Color Code free to use?

Yes, the Resistor Color Code is completely free, requires no signup, and runs instantly in your browser.