Choose band count and direction
State whether the marking has 4, 5, or 6 bands and read it left to right; the tool does not infer orientation.
Colors in · exact ohms out
Read resistor bands without hiding the arithmetic.
Select 4, 5, or 6 bands to decode resistance, tolerance range, and optional temperature coefficient—or enter a value to create an exact supported code. ResistorCode calculates locally from a reviewed color table and never rounds to a nearby marking, identifies a part, or judges circuit suitability.
No camera, part lookup, account, history, backend calculation, or generated result URL.
Three visible steps
Choose, calculate, verify
Select each color by role
Significant digits come first, then multiplier, tolerance, and for six bands the TCR coefficient.
Check value, range, and limits
Use the exact ohms and formula, then confirm the real component and ratings in its datasheet before circuit use.
Finite, focused references
Open the page that matches the marking job
- Decode 4-, 5-, or 6-band colors into an exact resistance.
- Encode an exactly representable resistance without nearest-value rounding.
- Review one color chart for digits, multipliers, tolerance, and TCR.
- Use one of 13 curated common-value pages without generating arbitrary URLs.
Use your own bands
Keep every role and limit visible
Choose band count and colors, or enter a resistance to encode. ResistorCode calculates locally and keeps exact ohms, tolerance range, formula, and optional TCR beside the answer.