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Music

Reddit-sourced calculators and references for music producers and audio engineers — BPM/ms, note frequency, semitone transpose, chord progressions, circle of fifths, LUFS targets, dBFS↔dB SPL, true-peak headroom, dynamic range, sample-rate bitrate, audio file size, time-stretch math, and mixing reverb / EQ / sidechain helpers.

26 tools available

Sub-categories

BPM Tap Detector

Tap along with your track and get the tempo in beats per minute.

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BPM ↔ Millisecond Converter

Convert BPM into the millisecond value used for delay and reverb time.

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Note Duration Calculator

See the millisecond value of every standard note duration at any BPM.

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Swing Percent Calculator

See how swing % changes the gap between off-beat eighths at any BPM.

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Note Frequency Calculator (Hz ↔ Note)

Convert any frequency to its nearest equal-temperament note and back.

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Semitone Transpose

Transpose any root note up or down by N semitones.

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Chord Progression Builder

Build a Roman-numeral chord progression from a key and see the diatonic chords.

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Circle of Fifths Explorer

See the key signatures, relative minors, and sharp/flat counts for every key.

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LUFS Target Calculator

Pick a streaming platform and see the integrated LUFS, true peak, and short-term targets.

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dBFS ↔ dB SPL Converter

Convert a digital level (dBFS) into a sound pressure level (dB SPL) for a speaker.

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True Peak & Limiter Headroom

See how much true-peak headroom to leave under 0 dBFS for any codec.

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Dynamic Range (DR) Calculator

Compute the crest factor and dynamic range of a track from peak and RMS.

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Sample Rate & Bit Depth Bitrate Calculator

Compute the bitrate of any PCM audio file from sample rate and bit depth.

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Audio File Size Estimator

Estimate the file size of a WAV, AIFF, FLAC, or MP3/AAC export.

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Time-Stretch Percent Calculator

Convert a tempo or length change percentage to BPM, length, and pitch artifacts.

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Reverb Pre-Delay Calculator

Set reverb pre-delay to keep the dry signal upfront and the tail behind.

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EQ Q-Factor Calculator

Convert EQ bandwidth in semitones into a Q value and back.

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Sidechain Filter Frequency Calculator

Set the sidechain high-pass frequency to keep the kick pumping without ducking the bass.

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Headphone Power Match

Will your USB DAC actually drive your headphones?

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Semitone ↔ Frequency

Convert any frequency to its semitone offset and note name from A4.

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Amp Power for Room Size

How many watts do you need for a room at a target SPL?

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Streaming LUFS / dBTP Target

Set your master loudness for Spotify, Apple, YouTube, or a club rig.

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Audio Recording Storage Estimator

Estimate the file size of an audio recording at any sample rate / bit depth.

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DAW Round-Trip Latency Estimator

Estimate the monitoring latency of your digital audio workstation.

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Room Acoustic RT60 Estimator

Estimate the reverberation time of a room using the Sabine formula.

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Acoustic Treatment Calculator

Estimate how much bass trap and panel area you need for a target RT60.

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