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Room mode frequencies (axial, tangential, oblique) for a rectangular room, plus Schroeder frequency from RT60.

Frequencies, cents and ratios of the 12 notes in equal, 5-limit just, Pythagorean or quarter-comma meantone tuning.

Add, average or subtract sound levels in dB: total of several sources, N identical sources, or background-corrected lev…

Audio buffer size to latency in ms (one way and round trip) at a sample rate, or the buffer needed for a latency target.

Dynamic range, levels and smallest step for a PCM bit depth, theoretical SNR, and the bit depth needed for a dB range.

Convert between linear amplitude and dBFS, and get the RMS level and crest factor of a sine, square, triangle or sawtoo…

Speed of sound in air at a temperature, wavelength and period for a frequency or the reverse, with delay per metre.

Sound level at another distance (inverse-square law; line sources fall 3 dB per doubling), or the distance for a level.

Convert a frequency ratio (3:2) to cents and semitones or back, name just and Pythagorean intervals and commas, apply t…

Loudness maths: gain to a LUFS target or platform, resulting true peak vs ceiling, or combining segment loudness.

Audio file size from bitrate and duration, or the bitrate or duration it implies; PCM size from rate, depth and channel…

Nyquist frequency for a sample rate, plus the alias frequency and samples per cycle of a tone, and the guard band above…