SMD resistor code calculator — 3-digit, 4-digit & EIA-96
Decode the tiny markings on SMD resistors — 3-digit, 4-digit or the EIA-96 two-digit-plus-letter code.
Marking format
Decoded value
Resistance
IEC 60062 marking — E24 / E96 preferred series
About the model
SMD resistor markings follow IEC 60062. A 3-digit code uses two significant figures followed by a power-of-ten exponent — 472 means 47 × 10² = 4.7 kΩ — and suits tolerances down to ±5%. A 4-digit code adds one more significant figure (1002 = 100 × 10² = 10 kΩ) for ±1% parts. The EIA-96 code, also ±1%, replaces all the digits with a two-digit lookup into a preferred number series (01 = 100 … 96 = 976) followed by a letter multiplier (Z = 0.001 … F = 100 000). In any format the letter R sits in for the decimal point, so 4R7 = 4.7 Ω.
For the parts themselves: SMD resistors and resistor kits carry these markings on their bodies.
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Frequently asked questions
How do I read a 3-digit SMD resistor code?
The first two digits are the value and the third is the multiplier (10^n) in ohms. 472 = 47 × 100 = 4.7 kΩ. An "R" marks the decimal point — 4R7 = 4.7 Ω.
How do I read a 4-digit SMD resistor code?
The first three digits are the value and the fourth is the multiplier: 1002 = 100 × 100 = 10 kΩ. 4-digit codes are used on 1% (E96) precision parts.
What is the EIA-96 code?
EIA-96 is the marking on 1% SMD resistors: two digits select a mantissa from the E96 table (01 = 100, 02 = 102 … 96 = 976) and a letter sets the multiplier (A = 1, B = 10, C = 100, D = 1k, E = 10k, F = 100k). 51D = 332 × 1k = 332 kΩ.
ICBOMS provides this tool for reference only.