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.
I (try) to make music. Mostly sample based, "boom bap" hip hop type stuff.While I (try) to make the music based on the feel, vibe, and "using my ear"; my more math oriented/logic brain often trumps the other. So this is a great app that I use quite a bit, when that part of my brain is winning over the other. In certain situations.Would looove to see a "pitch shift bpm loop calculator" feature added though. What I mean by that is a calculator that solves for X. Where X would be the number of semitones a loop of 100 bpm needs to be shifted, to make the loop 110 bpm instead. As an example. Or vice versa, etc etc...
Developer Response
Varispeed is coming in Calc 4.3 — built from this exact request. Thanks for the idea.
Really useful app
xjoshbrown
Instantly helped me trouble shoot a problem. A couple of the parameters are the bottom of the screen can’t be adjusted easily because of a UX issue but otherwise fantastic
Developer Response
Thank you so much for taking the time to share your thoughts! Cheers!
Incredibly useful! Now compatible with the current iOS. Get it!
Lutzbone
This app is fantastic. Absolutely indispensable. Thank you so much for a wonderful app!!
Developer Response
should be good now, enjoy!
A needed toolset
Vdrumpro999
Dev updated description to point out app was limited, setting the expectation bar to the proper level.. You say 3 calcs in first part of description, that's what I expect. FREE IS free.. Many of the classic free web apps for similar calcs are flash based.I DO like the thought of all these calcs together-- but give me a bulk buy vs. A la carte. I think I was most bummed about this app because I wished it existed not more than 5 hours before finding it in the store.. It was like a cosmic sign and blessing from above seeing it pop up in the store.. really a sucker punch when upon busting it out it wasn't as promoted (now at this point by me word of mouth) Initial review:Poor marketing model guys.. Next time, make the free version with two (useless nearly) calcs and paid one with all.. Your writeup says "included" but doesn't mention details about seperate purchases until the end.. You set your potential clients up for immediate disappointment..
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.
Version 4.3
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.
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Seller
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.
