SMD Resistor Code Calculator

This tool provides a rapid way to decode the marking systems used on surface-mount resistors. Because physical space is limited, manufacturers use condensed numerical and alphanumeric codes to denote resistance values and tolerances.

Use this tool to:

  • Decode Standard 3-Digit Codes: Found on 5% tolerance resistors where the first two digits are the value and the third is the multiplier.
  • Decode Precision 4-Digit Codes: Used for 1% tolerance resistors, utilizing three digits for the value and one for the multiplier.
  • Translate EIA-96 Alphanumeric Codes: A specialized 1% precision system where a two-digit lookup code (01-96) is followed by a letter multiplier.
  • Handle “R” Decimal Markings: Correctly interpret codes like 4R7 (4.7Ω) or R010 (0.01Ω) used in low-resistance and current-sensing applications.
SMD Resistor Code
Decoded Resistance

*Supports 3-digit (5%), 4-digit (1%), and EIA-96 (1% alphanumeric) marking systems.

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