SMD Resistor Calculator

A free online tool to decode 3 and 4-digit SMD resistor codes.

Surface Mount Device (SMD) Code Calculator

Enter the code printed on your SMD resistor

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How to Read SMD Resistor Codes

SMD resistors use a numerical marking system to indicate their resistance value:

3-Digit Code

  • First two digits: Significant figures
  • Third digit: Number of zeros to add
  • Example: "103" = 10 × 10³ = 10,000Ω = 10kΩ

4-Digit Code

  • First three digits: Significant figures
  • Fourth digit: Number of zeros to add
  • Example: "1002" = 100 × 10² = 10,000Ω = 10kΩ

Common SMD Codes

Code Value
10010 Ω
101100 Ω
1021 kΩ
10310 kΩ
104100 kΩ
1051 MΩ

Tips

  • ✓ Always verify the measured value with a multimeter
  • ✓ Some SMD resistors may use different marking systems
  • ✓ Consider the resistor's tolerance rating
  • ✓ Check the resistor's power rating for your application