Audiofile Calc — LUFS, dB, Hz

The audio engineering calculator you've relied on for years — completely reimagined.

Audiofile Calc has been rebuilt from the ground up with a modern interface, ergonomic controls, and a new Calc Pro tier that takes your calculations further. Now with a free dB Converter for instant decibel-to-ratio conversions, and Varispeed — the pitch shift BPM calculator our users asked for.

FREE CALCULATORS

Length
– Note Length
– Bar Length
– Song Length
– Beats to Tempo
– Time to Samples
– Samples to Time
– Timecode to Time
– Compare Tempos
– Change Tempo
– Add Times

Pitch
– Note Name to Frequency / MIDI / Wavelength
– Frequency to Note Name / MIDI / Wavelength
– Wavelength to Frequency / Note Name / MIDI

Timecode
– Frames to Timecode
– Convert Timecode
– Change Timecode

Electric
– Compare Power
– Compare Voltage
– NEW: dB Converter — turn any decibel value into its voltage (amplitude) and power ratios

Acoustics
– Distance to Time
– Delay
– Time to Distance
– Sound Pressure Level (SPL)
– Panning
– PAG-NAG

Files
– File Size

CALC PRO — $4.99 one-time

Unlock a suite of advanced calculators built for professional engineers and producers:

– NEW: Varispeed — tape-style and sampler speed changes, where tempo and pitch are coupled. Enter any BPM change and get the pitch shift in semitones, sampler-ready semitones + cents, and speed percentage
– LUFS Target — streaming loudness compliance for Spotify, Apple Music, YouTube, and broadcast (EBU R128)
– Nyquist Frequency — sample rate requirements, aliasing thresholds, anti-aliasing filter cutoffs
– Equal Loudness — Fletcher-Munson curves, equal-loudness compensation
– Cable Attenuation / Impedance — signal loss over cable runs, impedance matching
– Batch Conversion — sweep values through any calculator simultaneously
– PDF Share — export any calculation as a clean, professional PDF ready for clients, session notes, or technical documentation

One-time purchase. No subscription.

Audiofile is a boutique technology company building precision tools for the world's musicians and engineers.