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# Resistor tolerance checker

Check measured resistance readings against a nominal value and tolerance class to get per-reading pass or fail, deviation, and the nearest E-series preferred value.

Enter a nominal value, a tolerance class, and at least one measured value.

Pass or fail is arithmetic against the stated band; it is not a substitute for a calibration-grade meter. Readings near the band edge sit inside meter error, so treat marginal verdicts with suspicion. A batch where every reading sits on one side of nominal usually means a wrong reel or a meter that needs checking; readings scattered around the nominal are a normal batch.
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## More unit & math tools

- [555 timer calculator](/converters/555-timer-calculator)
- [Unit converter](/converters/units)
[All unit & math tools](/converters)

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