# Audiofile Calc — LUFS, dB, Hz

> Delay, SPL & Tempo Calculators

Canonical page: [https://chrome-stats.com/d/id337547274](https://chrome-stats.com/d/id337547274)

## Overview

- **ID:** `id337547274`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Audiofile Engineering, LLC
- **Category:** Music
- **Rating:** 4.50 / 5 (13 ratings)
- **Version:** 4.3
- **Last updated:** 2026-06-11
- **First published:** 2009-12-04
- **Size:** 1.16 MB
- **Data as of:** 2026-09-20
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/audiofile-calc-lufs-db-hz/id337547274)
- **Website:** [http://audiofile.engineering/](http://audiofile.engineering/)
- **Privacy policy:** [http://audiofile.engineering/privacy](http://audiofile.engineering/privacy)

## Description

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.

## Rankings

- #300,100 — Overall

## Review summary

Audiofile Calc is widely praised as indispensable for audio work, offering a comprehensive, free toolkit that streamlines workflows and is easy to use. However, reviewers repeatedly note compatibility issues with newer iOS versions and 32-bit support, input/precision and UI usability gaps, and concerns about ads or upgrade pricing. Despite these, its usefulness, breadth of tools, and solid design keep it highly regarded when it runs smoothly.

### Pros

- Extremely useful and time-saving for audio engineers.
- Broad, integrated set of calculators and tools for studio workflows.
- Free to use with a clean, intuitive, easy-to-learn interface.
- Generally accurate and stable when it runs properly with good design.

### Cons

- OS compatibility issues with newer iOS versions and 32-bit device support, leading to non-functionality on some devices/updates.
- Input and UI limitations, including limited decimal precision, hard-to-adjust bottom controls, and occasional input problems.
- Monetization and upgrade model concerns, such as ads after upgrading and confusion about what is free vs paid.
- Desire for more calculations and features (e.g., additional acoustic calculations) and improved precision in certain functions.

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Source: [Chrome-Stats](https://chrome-stats.com/d/id337547274)