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SMD Resistor Code

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Surface Mount Device (SMD) resistors use numeric codes instead of color bands. A 3-digit code has two significant digits plus multiplier. A 4-digit code has three significant digits plus multiplier. This calculator decodes both formats to the actual resistance value.

3-Digit: 473 = 47 × 10³ = 47,000Ω = 47kΩ4-Digit: 4702 = 470 × 10² = 47,000Ω = 47kΩ
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How to use this calculator

Step-by-Step Instructions

1. **Identify the code type** Standard SMD resistors (0805, 0603) use 3-digit codes. Precision resistors (1% tolerance, 0402 and larger) use 4-digit codes.
2. **Read the code** Use a magnifying glass or microscope. The code is printed on the top surface of the resistor.
3. **Select 3-digit or 4-digit** format, enter the code, and click Decode.

Pro Tips

  • The code “000” means 0Ω (zero ohm jumper). This is a common SMD jumper link.
  • For codes with “R” (like “4R7”), the R represents the decimal point: 4R7 = 4.7Ω. This calculator handles numeric codes only.