Is your indoor humidity in the healthy zone?
Enter your hygrometer reading and room temperature. You'll see where you sit against the EPA's 30–50% target, your dew point, and your mold and dust-mite risk.
Evidence-checked. Facts and figures on this page are verified against published standards and government sources (EPA indoor RH guidance, Magnus dew-point formula). Last verified July 2026 — our methodology.
Your air
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- Your reading
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- Dew point
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- Mold risk
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- Dust mites
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Healthy band: EPA recommends 30–50% RH indoors, and under 60% at all times. Dust mites need sustained RH above ~50%; mold risk climbs above 60%. Dew point uses the Magnus formula.
What to do with your number
If you're above the healthy band, our guide tolowering humidityranks the fixes cheapest first, and thesize calculator matches a dehumidifier to your space. Below 30%, you likely need a humidifier, not a dehumidifier — seewhich one you need.