📐 Decibel Formulas
dB = 10 × log₁₀(P₂/P₁) (Power)
dB = 20 × log₁₀(V₂/V₁) (Voltage)
dB = 20 × log₁₀(I₂/I₁) (Current)
dB = decibels, P = power, V = voltage, I = current, log₁₀ = base-10 logarithm
Decibels:
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Ratio:
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Change Factor:
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Description:
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💡 Tips & Information
- 3 dB = 2× power, 6 dB = 4× power
- 10 dB = 10× power, 20 dB = 100× power
- Negative dB = power reduction
- dB addition is not linear (logarithmic)
- Common reference: 0 dB = 1 mW (dBm)