Decibel Chart: Everyday Sounds Compared

At 100 dB, NIOSH says 15 minutes per day. At 120 dB or above, damage can begin within seconds. Brief, very loud impulses (gunshots, fireworks) can cause permanent damage on first exposure.

Yes — they reduce the volume you need to overcome background noise, which typically means lower in-ear dB at the same perceived loudness.

dBA adjusts the measurement to match how the human ear perceives loudness across frequencies. Most safety thresholds quoted here are dBA.

A decibel is a logarithmic unit measuring sound intensity relative to the threshold of human hearing (0 dB SPL). Every 10 dB increase represents a 10x increase in acoustic power and approximately a doubling of perceived loudness. Normal conversation is about 60 dB; a jet engine at 30m is about 140 dB.

The WHO recommends keeping leisure noise below 85 dB for a maximum of 8 hours. At 100 dB exposure should be limited to 15 minutes. At 110 dB, just 2 minutes can cause permanent noise-induced hearing loss (NIHL). Tinnitus risk begins with repeated short exposures above 85 dB.

Sleep researchers recommend white or pink noise at 50–60 dB for sleep — roughly the volume of a quiet conversation or refrigerator hum. This masks disruptive environmental sounds without raising overall noise exposure. Stay well below 70 dB for overnight use.

dB SPL measures raw sound pressure. dB(A) applies an A-weighting filter that de-emphasises low frequencies where the human ear is less sensitive. Occupational health regulations (OSHA, UK HSE) use dB(A) because it better predicts hearing damage risk from real-world noise.

Brown (red) noise has more energy in lower frequencies and sounds deeper and bassier than white noise, which has equal energy across all frequencies. At equal dB SPL, brown noise typically feels less harsh and is perceived as gentler — hence its popularity for sleep.

At 60 dB: normal conversation, background restaurant noise, a window air conditioner, moderate rainfall. This is generally considered a comfortable, non-fatiguing noise level for most adults and is close to the WHO recommendation for average daily exposure.

ASMR is most effective at 40–55 dB — softer than normal conversation. The intimacy of whispers and delicate sounds requires a quiet listening environment and either headphones at low volume or a close-proximity speaker. Cranking the volume reduces the ASMR effect and defeats its purpose.

White noise has equal energy at every frequency. Pink noise reduces energy by 3 dB per octave as frequency rises, matching the natural power spectrum of many natural sounds. Pink noise sounds warmer and is often preferred for sleep and study over the harsher quality of pure white noise.

Yes. Free smartphone apps (NIOSH SLM on iOS, DecibelX, Sound Meter) provide reasonably accurate readings for comparative purposes. Professional grade-1 or grade-2 sound level meters are needed for regulatory compliance measurements. App accuracy varies plus or minus 2–5 dB with built-in microphones.

In very quiet environments (below 20 dB), people often hear tinnitus-like ringing — a normal phenomenon called spontaneous otoacoustic emissions — and also become hyper-aware of bodily sounds like breathing and heartbeat. Low-level background sound (pink noise at 40 dB) can mask these and reduce discomfort.