Audio & Music
10 toolsBPM counters, note frequency calculators, chord finders, subwoofer box calculators, audio file size estimators, and an in-browser instrument tuner.
A practice room in the browser: a metronome with click tracks, an instrument tuner that listens through your microphone, tap tempo for finding a song’s BPM, and reference tools for note frequencies and chords.
The calculators handle the technical side of audio, from subwoofer box volumes to estimating file sizes at different bitrates.
Most popular
- Audio File Size Estimate audio file size for WAV/AIFF (uncompressed) and MP3/AAC/OGG (compressed). Enter sample rate, bit depth, channels, and duration to get file size in MB.
- Chord Finder Find the notes in any musical chord: major, minor, diminished, augmented, 7th, 9th, and more. Select root note and chord quality to see intervals and all enharmonic spellings.
- Chord Progressions Build diatonic triad progressions in 12 keys and six modes. See quality-aware Roman numerals, set playback from 40–200 BPM, and audition chords.
- Note Frequency Convert between note names (C4, A4, Bb3), MIDI note numbers, and frequencies in Hz. Supports A440 and A432 tuning. Shows octave, cents deviation, and wavelength.
- Instrument Tuner Tune any instrument using your browser microphone. Detects pitch via autocorrelation, displays the nearest note name and cents deviation. Nothing is uploaded.
- Metronome Free online metronome with adjustable BPM, beat counts, and subdivisions. Start/stop with a click. Runs in your browser using Web Audio API, no install required.
- Tone Generator Generate browser tones from 20 Hz to 20 kHz. Choose sine, square, sawtooth, or triangle, set a note or frequency, and play sound locally in your browser.
- Subwoofer Box Calculate ported subwoofer box port length from enclosure volume, tuning frequency, and port diameter. Also checks box volume and port velocity recommendations.
- Tap Tempo Tap the button or press Space to measure BPM in real time. Displays rolling average, rejects outliers, and shows milliseconds per beat and musical note values.
- Video Audio Extractor Extract audio from video files in your browser as WAV, Opus, or AAC. Optionally trim volume-based silence. Private, free, and no uploads.
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