What is the formula for SMD Resistor Marking Calculator?

Core formula: 3-digit AB×10^C | 4-digit ABC×10^D | R as decimal point | EIA-96: index (01–96) × multiplier letter. The tool returns results instantly using this formula and the selected parameters.

What engineering notes should I keep in mind when using SMD Resistor Marking Calculator?

3-digit code: the first two digits are significant, the last is the power of 10, e.g. 103 = 10×10³ = 10 kΩ, 472 = 4.7 kΩ. 4-digit code: the first three digits are significant, the last is the power of 10, e.g. 1002 = 100×10² = 10 kΩ, 4992 = 49.9 kΩ. Low values use R for the decimal point: 4R7 = 4.7 Ω, R47 = 0.47 Ω, 0R05 = 0.05 Ω; all zeros (000 / 0000) is a 0 Ω jumper. EIA-96 code: the 2-digit index 01–96 maps to the E96 nominal series and the trailing letter is the multipli…

SMD Resistor Marking Calculator

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Convert SMD resistor markings and resistance in both directions: 3-digit code (103 = 10 kΩ), 4-digit code (1002 = 10 kΩ), R decimal notation (4R7 = 4.7 Ω, R47 = 0.47 Ω) and EIA-96 precision code (01C = 10 kΩ), including all-zero jumpers.

Key points

SMD Resistor Marking Calculator: Convert SMD resistor markings and resistance in both directions: 3-digit code (103 = 10 kΩ), 4-digit code (1002 = 10 kΩ), R decimal notation (4R7 = 4.7 Ω, R47 = 0.47 Ω) and EIA-96 precision code (01C = 10 kΩ), including all-zero jumpers. Formula: 3-digit AB×10^C | 4-digit ABC×10^D | R as decimal point | EIA-96: index (01–96) × multiplier letter. Enter parameters on the DD-CAT IDE online tool page to get results instantly, with a calculation-model diagram that updates with the inputs. 3-digit code: the first two digits are significant, the last is the power of 10, e.g. 103 = 10×10³ = 10 kΩ, 472 = 4.7 kΩ. 4-digit code: the first three digits are significant, the last is the power of 10, e.g. 1002 = 100×10² = 10 kΩ, 4992 = 49.9 kΩ.

Inputs

3-digit AB×10^C | 4-digit ABC×10^D | R as decimal point | EIA-96: index (01–96) × multiplier letter

Calculation model (updates with parameters)

Resistance R	10 kΩ	first two digits 10 are significant; the last digit 3 is the power of 10 → 10 × 10^3 Ω
Marking system	3-digit code
Default tolerance	±5% (general purpose)
Common packages	Larger sizes such as 0805 / 1206

Engineering notes

3-digit code: the first two digits are significant, the last is the power of 10, e.g. 103 = 10×10³ = 10 kΩ, 472 = 4.7 kΩ.
4-digit code: the first three digits are significant, the last is the power of 10, e.g. 1002 = 100×10² = 10 kΩ, 4992 = 49.9 kΩ.
Low values use R for the decimal point: 4R7 = 4.7 Ω, R47 = 0.47 Ω, 0R05 = 0.05 Ω; all zeros (000 / 0000) is a 0 Ω jumper.
EIA-96 code: the 2-digit index 01–96 maps to the E96 nominal series and the trailing letter is the multiplier (Z=10⁻³, Y/X=10⁻²/10⁻¹, A=1, B=10, C=100, D=10³, …), common on 0603/0402 precision resistors.
The marking direction usually starts from the terminal/dot; for resistors with obscured or sanded markings, verify by measurement.

FAQ

What is SMD Resistor Marking Calculator for?: Convert SMD resistor markings and resistance in both directions: 3-digit code (103 = 10 kΩ), 4-digit code (1002 = 10 kΩ), R decimal notation (4R7 = 4.7 Ω, R47 = 0.47 Ω) and EIA-96 precision code (01C = 10 kΩ), including all-zero jumpers.
What is the formula for SMD Resistor Marking Calculator?: Core formula: 3-digit AB×10^C | 4-digit ABC×10^D | R as decimal point | EIA-96: index (01–96) × multiplier letter. The tool returns results instantly using this formula and the selected parameters.
What engineering notes should I keep in mind when using SMD Resistor Marking Calculator?: 3-digit code: the first two digits are significant, the last is the power of 10, e.g. 103 = 10×10³ = 10 kΩ, 472 = 4.7 kΩ. 4-digit code: the first three digits are significant, the last is the power of 10, e.g. 1002 = 100×10² = 10 kΩ, 4992 = 49.9 kΩ. Low values use R for the decimal point: 4R7 = 4.7 Ω, R47 = 0.47 Ω, 0R05 = 0.05 Ω; all zeros (000 / 0000) is a 0 Ω jumper. EIA-96 code: the 2-digit index 01–96 maps to the E96 nominal series and the trailing letter is the multipli…