SMD marking tool3-digit code

SMD Resistor Code Calculator

Decode 3-digit, 4-digit, EIA-96, and R/K/M marked chip resistor values instantly for sourcing and engineering checks.

Type the marking from a chip resistor package to decode the resistance value and move directly into stock search.

Marking reference

Decode the package code fast

3-digit / 4-digit / EIA-96

Code input

Supports common chip resistor marking systems used in purchasing, FA, and design reviews.

Instant decode

SMD resistor code

Examples

472, 1001, 01C, 4R7

Detected type

3-digit code

Decode rule

47 x 10^2

Decoded result

Valid

Resistance value

4.7 kOhm

Code 472 maps to 4.7 kOhm. Use this value for BOM confirmation, alternates, and stock search.

Code type

3-digit code

Formula

47 x 10^2

Suggested search

4.7k 1% 0603 resistor

Need components for your project? Search parts & check stock instantly.

Turn the decoded value into sourcing

Once the marking is decoded, move directly into chip resistor sourcing with search and RFQ shortcuts.

Suggested query

4.7k 1% 0603 resistor

Escalate to BOM

Need multiple resistor lines checked?

Upload the full BOM when a single chip marking turns into a wider replacement or risk-screening task.

Yageo RC Series

Common thick-film SMD resistor family for mainstream BOM fulfillment and quick substitutions.

0201-1206

UniOhm WR Series

Useful when you need stable availability on commodity chip resistor values.

0402-2512

Vishay CRCW

Widely specified series for industrial and design-locked resistor sourcing.

0402-2512

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How to read chip resistor markings

How to calculate SMD resistor codes

An SMD resistor code calculator converts the package marking printed on a chip resistor into its actual resistance value. This is useful during incoming inspection, reverse engineering, repair, and BOM verification.

The most common formats are 3-digit, 4-digit, EIA-96, and decimal letter markings such as 4R7 or 2K2. Each format uses a different rule, so a fast decoder helps buyers and engineers avoid ordering the wrong value.

SMD resistor code formula and decode logic

General rule

R = (s i g) \cdot 10^{m}

R = significant digits \times 10^{multiplier}

3-digit codes use the first two digits as significant figures and the last digit as the power of ten.
4-digit codes use the first three digits as significant figures and the last digit as the power of ten.
EIA-96 uses a lookup number plus a letter multiplier.

Common SMD resistor code examples

Code	Type	Resistance
472	3-digit	4.7 kOhm
1001	4-digit	1 kOhm
01C	EIA-96	10 kOhm
4R7	Decimal	4.7 Ohm

FAQ

Frequently asked questions about SMD resistor codes

What does 472 mean on an SMD resistor?

It means 47 multiplied by 10 squared, which equals 4700 Ohms or 4.7 kOhm.

How do I read EIA-96 resistor codes?

Use the two-digit number as a lookup reference and the trailing letter as the multiplier.

What does R mean in an SMD resistor code?

The letter R acts as a decimal point, so 4R7 means 4.7 Ohms.