Audio Frequency Fatigue Calculator
Enter a sound level in dBA to see the maximum safe listening time under the NIOSH and OSHA exposure standards, with a risk rating — plus why the 2–5 kHz range drives listening fatigue.
⚕ Educational, not a substitute for a real measurement or medical advice. A browser can’t measure your actual exposure — enter a level you measured (e.g. with a calibrated meter or our Decibel Meter as a rough guide). The safe-time figures use the official NIOSH/OSHA formulas, but real risk depends on your true dose. If you have ringing, muffling or any hearing concern, see an audiologist.
Reference: levels & NIOSH safe time
Exposure & the Fatigue Zone
Safe exposure time comes from occupational standards. NIOSH recommends a limit of 85 dBA for 8 hours with a 3 dB exchange rate — every 3 dB louder halves the safe time (88 dBA → 4 h, 91 → 2 h, 100 → 15 min). OSHA’s legal limit is more lenient: 90 dBA for 8 hours with a 5 dB exchange rate. This calculator applies those exact formulas, so you can see how quickly safe time shrinks as level rises.
Listening fatigue is different from hearing damage — it’s the tiredness and irritation that builds up well below dangerous levels, and it concentrates in the 2–5 kHz region. That’s no accident: the ear canal resonates around 3 kHz, making us most sensitive there, so harshness, sibilance and cymbal/edge energy in that band feel fatiguing fastest. Taming 2–5 kHz, keeping levels moderate, and taking regular breaks all reduce fatigue.
Reducing fatigue and protecting your hearing
- Keep everyday listening well below 85 dBA where you can; the quieter, the longer it’s safe.
- Take breaks — the "60/60" idea (≤60% volume, ≤60 minutes, then rest) is a simple habit.
- For sustained loud environments (concerts, power tools), wear hearing protection.
- If a mix feels harsh or tiring, look first at the 2–5 kHz range rather than just turning everything down.