Sound Level Converter

Convert between all common sound level units instantly. Select your units from the dropdowns below and enter a value to see the conversion in real-time.

SI unit: neper (Np)

Conversion Formula

About Sound Level Units

Common Sound Level Conversions

• 1 Np = 20/ln(10) dB ≈ 8.6859 dB ≈ 0.8686 B
• 1 dB = ln(10)/20 Np ≈ 0.11513 Np = 0.1 B = 10 cB = 100 mB
• 1 B = 10 dB = ln(10)/2 Np ≈ 1.15129 Np
• 0 dB SPL = threshold of human hearing in air (reference: 20 µPa)
• 60 dB SPL = normal conversation at ~1 m distance
• 85 dB SPL = NIOSH/OSHA 8-hour occupational exposure limit
• 120 dB SPL = threshold of pain
• 194 dB SPL = maximum theoretical undistorted sound pressure in air at 1 atm

Direct Converters