Audiofile Calc — LUFS, dB, Hz
Delay, SPL & Tempo Calculators
Free · In-App Purchases · Designed for iPad. Not verified for macOS.
NEW: dB Converter (free) and Varispeed pitch/BPM (Pro). 26 free audio engineering calculators. Calc Pro adds LUFS targets, batch mode, PDF share. $4.99 once.
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.
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Two new calculators — one for everyone, one for Calc Pro.
New in this release:
– dB Converter (free) — turn any decibel value into its voltage (amplitude) and power ratios. The perfect companion to Compare Power and Compare Voltage, which go the other direction
– Varispeed (Calc Pro) — the pitch shift BPM calculator you asked for. Enter a source and target tempo and get the pitch shift in semitones, sampler-ready semitones + cents, and the speed change percentage for tape-style and sampler speed changes
Calc Pro keeps growing — one purchase, every new pro calculator included.
The developer, Audiofile Engineering, LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- Audiofile Engineering, LLC
- Size
- 1.2 MB
- Category
- Music
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Audiofile Calc Pro $4.99
- Copyright
- © 2026 Audiofile Engineering, LLC