Decibel Calculator
dB v1.0
85.0
0
30
60
85
100
120
140
100.0
0.1
1
10
100
1000
10.0
0.1
1
10
100
1000
dB SPL
85.0
dB Power
20.0
dB Amplitude
20.0
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Decibel Scale
0 dB
40 dB
60 dB
85 dB
100 dB
120 dB
140 dB
Reference:
20 µPa (SPL)
Perceived Loudness
Loud
Hearing Risk
Moderate
Sound Type
City Traffic
Relative Loudness
1.0×
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Common Sound Levels
Whisper
30 dB
Conversation
60 dB
City Traffic
85 dB
Lawn Mower
95 dB
Rock Concert
110 dB
Jet Takeoff
140 dB
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Formula
dB SPL = 20 × log₁₀(P / P₀)
P = Sound Pressure, P₀ = 20 µPa (reference)
dB Power = 10 × log₁₀(P₂ / P₁)
dB Amplitude = 20 × log₁₀(A₂ / A₁)
Decibels are logarithmic — +10 dB = 10× power
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Decibel Guide
- 1 0-30 dB: Very quiet, whispering
- 2 30-60 dB: Normal conversation
- 3 60-85 dB: Moderate, some risk
- 4 85-120 dB: Loud, hearing damage risk
- 5 120+ dB: Pain threshold, immediate risk