dB Calculator
Convert between decibels, voltage ratios, and power ratios. Enter a value in any field and the others update automatically.
Converter
Decibels
dB
Voltage Ratio
V₂ / V₁
Power Ratio
P₂ / P₁
Quick Reference
Double voltage+6 dB
Double power+3 dB
10× power+10 dB
Half voltage-6 dB
Half power-3 dB
Perceived 2× loud+10 dB
Digital full scale0 dBFS
Headroom (typical)-6 dBFS
Noise floor (-24 bit)-144 dB
Threshold of pain~130 dB SPL
Whisper~30 dB SPL
Unity gain0 dB
Remember: Decibels are logarithmic. +3 dB doubles the power, while +6 dB doubles the voltage (amplitude). A +10 dB increase sounds roughly twice as loud. When mixing, aim for -6 dBFS headroom before mastering.