Inductor color code calculator — µH decoder
Interactive engineering and procurement calculator. Instant client-side computation with no sign-up.
Bands
Decoded value
Inductance
10 ×100 = 1000 µH
Tolerance
Color → %
Worked example: brown-black-red-gold = 10 × 100 = 1000 µH = 1 mH ±5%.
Quick reference
| Value | Bands | Tolerance |
|---|---|---|
| 2.2 µH | Red 2 · Red 2 · ×0.1 | Gold ±5% |
| 4.7 µH | Yellow 4 · Violet 7 · ×0.1 | Gold ±5% |
| 10 µH | Brown 1 · Black 0 · ×1 | Gold ±5% |
| 22 µH | Red 2 · Red 2 · ×1 | Gold ±5% |
| 47 µH | Yellow 4 · Violet 7 · ×1 | Gold ±5% |
| 100 µH | Brown 1 · Black 0 · ×10 | Gold ±5% |
| 220 µH | Red 2 · Red 2 · ×10 | Gold ±5% |
| 470 µH | Yellow 4 · Violet 7 · ×10 | Gold ±5% |
| 1 mH | Brown 1 · Black 0 · ×100 | Gold ±5% |
About the model
Military-style radial and axial inductors (MIL-PRF-15305) use the same color code as resistors, but the decoded value is in microhenries: the first two rings are significant digits, the third is the decimal multiplier in µH (silver ×0.01 and gold ×0.1 for sub-µH parts), and an optional fourth ring gives the tolerance. The value is (d1×10 + d2) × multiplier µH.
Modern surface-mount (SMD) inductors use a numeric code instead of bands — for example 4R7 = 4.7 µH, with a multiplier letter like R (×0.1) or n (×0.001).
Browse related parts: