Resistor Color Code
⚡ Electrical-Electronics · 4-band resistor value solver — live visual display
Traditional axial (non-SMD) resistors use colored bands instead of printed numbers — this provides a marking method that’s independent of print orientation during manufacturing and readable from any angle. The standard is defined in IEC 60062.
On a 4-band resistor: the first two bands give the significant digits, the third band gives the multiplier (a power of 10), and the fourth gives the tolerance. Gold and silver bands can serve as either a multiplier or a tolerance band, which helps determine the reading direction — the tolerance band (usually gold or silver) is always on the far right, farthest from the first digit band.
Memory tip: the color order “Black Brown Red Orange Yellow Green Blue Violet Gray White” (0 through 9) can be memorized — many engineering students use various mnemonic sentences for this.
This tool's calculation logic has been checked against a hand-computed numerical verification test. Test source: src/lib/calc/renk.test.ts.
- [7] IEC. IEC} 60062 — Dirençler ve Kondansatörler için İşaretleme Kodları. International Electrotechnical Commission. (TODO(oz): güncel baskı yılı doğrulanmalı) ↗
Resistor Color Code — EngineersLab calc card
Formula: value = (10×digit1 + digit2) × multiplier
Sources: [7] IEC} 60062 — Dirençler ve Kondansatörler için İşaretleme Kodları
Tool version: 1.0.0 · Date:
Source URL: https://engineerslab.com.tr/en/araclar/renk
Results are for educational and preliminary-sizing purposes; final engineering design decisions must reference the relevant standards and a licensed engineer's approval.