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70 dB vs 120 dB

120 dB is 50 dB louder than 70 dB — about 100000× the sound energy and roughly 32.0× the perceived loudness. In practice that is the difference between a vacuum cleaner at 3 m and an ambulance siren at 1 m.
70 dB 120 dB 70 120
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.
70 dB120 dB
Typical sourceA vacuum cleaner at 3 mAn ambulance siren at 1 m
CategoryLoudDangerous
Sound pressure0.0632 Pa20.0000 Pa
NIOSH safe timeUnlimited8.9 sec
Protection neededNoYes

Why 50 dB is a bigger jump than it looks

A 50 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 70 dB to 120 dB therefore multiplies the acoustic energy by about 100000× while your ear reports something closer to 32.0× as loud. Both statements are true — they simply measure different things.

Which one is safe?

70 dB is safe for unlimited exposure, but 120 dB is at or above the 85 dBA action level, where safe time is about 8.9 sec without protection.

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 50 dB difference is to think in distance. Outdoors, every doubling of distance removes about 6 dB, so standing at 120 dB versus 70 dB is roughly like standing 316.2× closer to the same source. Conversely, moving about 316.2× further away would bring 120 dB down to 70 dB.

Adding the two levels together

Decibels do not add arithmetically. A 70 dB source running alongside a 120 dB source does not produce 190 dB — the correct total is 120.0 dB, calculated as 10 × log₁₀(10^(70/10) + 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 70 dB?
120 dB carries about 100000 times the sound energy of 70 dB and is perceived as roughly 32.00 times as loud.
What is the difference between 70 dB and 120 dB?
The difference is 50 dB. 70 dB is comparable to a vacuum cleaner at 3 m, while 120 dB is comparable to an ambulance siren at 1 m.
What do 70 dB and 120 dB add up to?
Combined, two sources at 70 dB and 120 dB produce about 120.0 dB — not 190 dB — because decibels add logarithmically.
Which is safe, 70 dB or 120 dB?
70 dB is below the 85 dBA action level and safe, while 120 dB is at or above it and needs an exposure limit.

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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.