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95 dB vs 120 dB

120 dB is 25 dB louder than 95 dB — about 316× the sound energy and roughly 5.7× the perceived loudness. In practice that is the difference between an electric power drill and an ambulance siren at 1 m.

The bars show the two levels on the 0–140 dB scale. The gap looks small as a number, but on a logarithmic scale each 10 dB is a ten-fold jump in energy.

	95 dB	120 dB
Typical source	An electric power drill	An ambulance siren at 1 m
Category	Very loud	Dangerous
Sound pressure	1.1247 Pa	20.0000 Pa
NIOSH safe time	48 min	8.9 sec
Protection needed	Yes	Yes

Why 25 dB is a bigger jump than it looks

A 25 dB gap looks small written down, but decibels are logarithmic. Every 10 dB multiplies sound energy by ten and roughly doubles perceived loudness. Going from 95 dB to 120 dB therefore multiplies the acoustic energy by about 316× while your ear reports something closer to 5.7× as loud. Both statements are true — they simply measure different things.

Which one is safe?

Both levels are at or above the 85 dBA action level, so both need exposure limits. At 120 dB the safe unprotected window is only about 8.9 sec.

Hearing protection

For anything above 85 dB, rated protection matters. Look at the NRR (US) or SNR (EU) figure — real-world reduction is roughly (NRR − 7) ÷ 2.

Electronic ear muffs (NRR 22–25)Shooting, mowing — amplify speech, block bangsLink coming soon

Reusable filtered earplugs (NRR 20)Concerts & musicians — flat attenuationLink coming soon

Foam earplugs (NRR 32)Sleep, travel, DIY — highest raw NRRLink coming soon

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The distance equivalent

One intuitive way to feel a 25 dB difference is to think in distance. Outdoors, every doubling of distance removes about 6 dB, so standing at 120 dB versus 95 dB is roughly like standing 17.8× closer to the same source. Conversely, moving about 17.8× further away would bring 120 dB down to 95 dB.

Adding the two levels together

Decibels do not add arithmetically. A 95 dB source running alongside a 120 dB source does not produce 215 dB — the correct total is 120.0 dB, calculated as 10 × log₁₀(10^(95/10) + 10^(120/10)). Because the louder source dominates, the quieter one contributes only 0.0 dB. Our decibel calculator does this for any combination.

Frequently asked questions

Is 120 dB much louder than 95 dB?

120 dB carries about 316 times the sound energy of 95 dB and is perceived as roughly 5.66 times as loud.

What is the difference between 95 dB and 120 dB?

The difference is 25 dB. 95 dB is comparable to an electric power drill, while 120 dB is comparable to an ambulance siren at 1 m.

What do 95 dB and 120 dB add up to?

Combined, two sources at 95 dB and 120 dB produce about 120.0 dB — not 215 dB — because decibels add logarithmically.

Which is safe, 95 dB or 120 dB?

Both exceed the 85 dBA action level, so both need exposure limits and, ideally, hearing protection.

See each level in detail

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Sources & accuracy. Reference levels are drawn from published data by NIOSH, OSHA, the CDC, the WHO Environmental Noise Guidelines and the American Speech-Language-Hearing Association (ASHA). Real-world readings vary with distance, room acoustics and the specific source, so treat every figure as a typical value rather than an exact constant. Last reviewed 2026-08-11.