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SMD Resistor Code Calculator

Work out smd resistor code instantly with clear inputs, formula shown and shareable results.

About SMD Resistor Code Calculator

Surface-mount resistors are marked numerically rather than with colours. Three-digit codes give two significant digits plus a power of ten (472 is 4.7 kΩ), four-digit codes give three digits plus multiplier (4702 is 47 kΩ), and R marks a decimal point (4R7 is 4.7 Ω). EIA-96 uses a two-digit E96 index plus a multiplier letter.

Formula

SMD codes

Three digit: value = first two digits x 10^third; R indicates the decimal point

Worked example

With the default values below, SMD Resistor Code Calculator returns Resistance of 4,700.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Marking code
472
Marking systemone of Three digit, Four digit, EIA-96 (two digits + letter)
Three digit

Results

Resistance
4,700.00 Ω
Value
4.7 kΩ
How the code was read
Two significant digits then multiplier
Multiplier applied
3 x

Step by step

  1. 1Values used
  2. 2SMD codes
  3. 3Resistance= 4,700.00 Ω
  4. 4Value= 4.7 kΩ
  5. 5How the code was read= Two significant digits then multiplier
  6. 6Multiplier applied= 3 x

Assumptions and limits

  • The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Electrical results are planning estimates only. Verify against the applicable wiring rules (IEC 60364, BS 7671, NEC or local code) and have all installation work designed and checked by a qualified electrician.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Electrical results are planning estimates only. Verify against the applicable wiring rules (IEC 60364, BS 7671, NEC or local code) and have all installation work designed and checked by a qualified electrician.

Frequently Asked Questions

Why does 472 mean 4.7k and not 472 ohms?

The last digit is the number of zeros, not a significant figure. 472 is 47 followed by two zeros, so 4,700 ohms.

How do I read 01C in EIA-96?

01 is E96 index 1, which is 100 (i.e. 1.00), and C multiplies by 100, giving 100 ohms.

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