Read 3-digit, 4-digit, and R-notation codes.
Unlike traditional through-hole resistors that use painted color bands to indicate their value, modern PCB (Printed Circuit Board) designs utilize microscopic Surface Mount Device (SMD) resistors. Because these components are often smaller than a grain of rice, printing a full numerical value on them is impossible. Instead, manufacturers use a standardized 3-digit or 4-digit coding system. Our SMD Code Calculator helps electronics repair technicians and DIY hobbyists instantly decipher these codes back into measurable Ohms (Ω).
The standard system relies on base numbers and multipliers. For a 3-digit code (like `103`), the first two digits form the base value (10), and the third digit is the multiplier (add 3 zeros), making it 10,000 Ω or 10kΩ. The 4-digit system works identically but provides more precision, using three base digits and one multiplier. Finally, the "R" Notation (like `4R7`) is used for very small values, where the "R" simply acts as a decimal point, meaning `4R7` is exactly 4.7 Ohms. Input any of these standard formats into the tool above to get instant results!
AI-generated estimates. No guarantee of accuracy. We assume no liability for decisions based on these results. Independent verification is recommended.