dB Calculator

Convert between decibels and voltage/power ratios. Calculate gain, attenuation, and SPL levels for audio systems.

Calculation Type

Direction

Values

Result

0.00
dB
Ratio: 1.0000

Common dB Values

Unity gain / Reference level0 dB
Double power (+3 dB)+3 dB
Double voltage (+6 dB)+6 dB
Perceived 2x loudness+10 dB
10x voltage / 100x power+20 dB
Half power (-3 dB)-3 dB
Half voltage (-6 dB)-6 dB
Perceived 1/2 loudness-10 dB
1/10 voltage / 1/100 power-20 dB

SPL Reference Levels

Threshold of hearing0 dB SPL
Quiet room30 dB SPL
Normal conversation60 dB SPL
Heavy traffic85 dB SPL
Loud concert100 dB SPL
Threshold of pain120 dB SPL
Jet engine at 30m140 dB SPL

Formulas

Voltage/Amplitude:
dB = 20 × log₁₀(V₁/V₂)
Power:
dB = 10 × log₁₀(P₁/P₂)
SPL:
dB = 20 × log₁₀(p/20µPa)
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FAQ

Frequently Asked Questions

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dB Calculator - Voltage, Power & SPL | Patchify