Tuning Frequency Calculator

Hearing caution: The optional oscillator starts only when you press its button. Lower your device volume before enabling it; stop immediately if sound is uncomfortable. Sustained or loud tones can harm hearing. The fixed browser gain ramp does not control amplifier, headphone, or system volume.

Calculate equal-temperament steps from a configurable reference, with cents, ratios, wavelength, nearest-step lookup, and tables.

Tuning definition

Equal divisions per octave

Reference note

Reference octave

Reference frequency (Hz)

Target note

Target octave

12-EDO spelling

Sound speed and wavelength

Sound speed source

Air temperature (°C)

Table and nearest-step lookup

Table steps below target

Table steps above target

Entered frequency for nearest step (Hz)

Math and scope: Frequency = reference frequency × 2^{steps ÷ divisions}; cents = steps × 1200 ÷ divisions. “Octave” and numeric step form a coordinate system for non-12 tunings and do not assign conventional note identities. Conventional chromatic note names are shown only for 12-EDO. Wavelength = entered/approximated sound speed ÷ frequency. The dry-air approximation is 331.3 + 0.606 × temperature °C and omits humidity, pressure, gas composition, gradients, rooms, instrument inharmonicity, stretch tuning, temperament history, and transducer response. The oscillator is a simple sine reference, not a calibrated tuner or level source, and is cleaned up when stopped or when the page is left.

Tuning Frequency Calculator

Tuning definition

Sound speed and wavelength

Table and nearest-step lookup

Target result

Frequency table