Resistor Color Code Workbench

How to use Resistor Color Code Workbench

Significant color digits multiply by the chosen decade/gold/silver multiplier, followed by tolerance. Reverse conversion requires a representable significant-digit value; it does not silently round to another resistor.

1. Enter band color names in order, resistance to encode (ohms).
2. Choose the stated convention and check the units and supported model.
3. Calculate, inspect the result, then copy or download it.

Good to know

• Four/five-band resistance/tolerance only, nonblack first digit. Zero-ohm jumpers, capacitor markings, TCR and military markings are unsupported. Tolerance is a nominal band meaning, not a measurement.
• Runs locally. Text/JSON fields are capped at30,000 characters; stricter page-specific and numeric-string limits also apply. Numeric inputs are bounded to magnitude1e15 and nonzero magnitude at least1e-100 unless an exact-string mode states otherwise. Approximate summaries use12 significant digits; CSV numeric cells retain the complete stored value and potentially formula-like string cells gain a protective apostrophe; unsupported, non-finite or detected underflow states return an error.