SMD Resistor Decoder
Enter the marking
Type the code printed on the top of the SMD resistor.
Examples — 223 (3-digit), 1002 (4-digit), C00 / R05 (EIA-96).
Decoded value
How SMD markings work
3-digit: the first two digits are the significant figures and the third is the power-of-ten multiplier of zeros — e.g. 223 = 22 × 10³ = 22 kΩ. 4-digit: three significant figures plus a multiplier — e.g. 1002 = 100 × 10² = 10 kΩ. EIA-96 (the 1%/3% series): a letter prefix plus two digits encodes the value from the preferred EIA-96 table — e.g. C00 = 200 Ω — with an optional fourth digit as the multiplier.
Why it matters
SMD resistors are too small to print a full value, so the code is the only label. Decoding it correctly is essential when substituting parts, debugging a board, or building a Bill of Materials — a misread multiplier turns a 2.2 kΩ into a 22 kΩ and can quietly break a bias or timing network. The decoder validates the format, shows the exact arithmetic, and flags unrecognized codes so you never solder in a wrong part on a guess.