Convert Centinepers to Millibels

Convert Centinepers (cNp) to Millibels (mB) instantly and accurately.

Conversion Formula

mB = cNp × 8.685889638

About Centinepers

The centineper (cNp) is one-hundredth of a neper (1 cNp = 0.01 Np ≈ 0.08686 dB). In fibre-optic engineering, next-generation ultra-low-loss G.654.E optical fibre achieves below 0.15 dB/km ≈ 1.73 cNp/km at 1550 nm. Transmission-line textbooks (Pozar, Collin) use nepers per metre for the attenuation constant α; the centineper resolves sub-1-dB precision commonly needed in filter and amplifier characterisation. In underwater acoustics, seawater absorption at 100 kHz (relevant for high-frequency sonar) is ≈ 0.04 dB/m ≈ 4.6 × 10⁻³ cNp/m (ISO 18405). In hearing science, adaptive psychophysical procedures probe detection thresholds at 0.1 dB step sizes ≈ 1.15 cNp, precision necessary to map fine structure in the auditory threshold contour. 1 cNp = 0.01 Np ≈ 0.08686 dB ≈ 8.686 × 10⁻³ B.

About Millibels

The millibel (mB) is one-thousandth of a bel (1 mB = 10⁻³ B = 0.01 dB), the finest routine subdivision of the bel family in widespread practical use. The AES17-2015 standard for digital audio converter measurement requires frequency response flatness within ±0.01 dB (±1 mB) across 10 Hz–20 kHz for a reference-quality interface. Audiometer calibration (IEC 60645-1, ANSI S3.6) specifies attenuator step accuracy to ±0.1 dB (10 mB) for research-grade psychoacoustic instruments. Modern audio codec chips (ESS Sabre ES9038PRO) specify passband ripple to 0.01 dB = 1 mB. In broadcast loudness metering (EBU R128, ITU-R BS.1770), integrated loudness is calculated at 0.1 LU = 10 mB resolution. IEC 61672-1 Class 1 sound level meters achieve frequency response flatness within ±0.7 dB (70 mB) from 31.5 Hz to 8 kHz. 1 mB = 0.001 B = 0.01 dB ≈ 1.151 × 10⁻³ Np.

Quick Reference Table

→ Full Sound Level Converter