Enter values
Formula and methodology
Four-band codes use two significant digits; five- and six-band codes use three. The next band is the decimal multiplier, followed by tolerance; a sixth band records temperature coefficient.
How to use the result
Check that each input uses the intended unit, then compare the displayed result with the assumptions above. Recalculate when the source values or operating conditions change. Do not use an estimate as a substitute for equipment documentation or professional review where safety depends on the result.
Reviewed sources
- Resistor Color Code Chart — Vishay Intertechnology; reviewed September 1, 2026.
Method reviewed September 1, 2026. Scheduled review by 2028-08-31.