Musical frequency (Hertz) calculator
Convert any frequency to its closest musical note, wavelength, and cycle time. Supports different tuning standards (A440, baroque) and temperaments (equal, just intonation).
Results
Frequency Calculation
Piano Visualization
On a 88-key piano
References
Frequently Asked Questions
What is A440 tuning?
A440 is the modern standard pitch where the A above middle C (A4) vibrates at 440 Hz. Most instruments and orchestras tune to this frequency. Historical tunings used A415 (baroque) or A432.
What is the difference between equal and just temperament?
Equal temperament divides the octave into 12 equal semitones, allowing music in any key. Just intonation uses pure frequency ratios (like 3:2 for a fifth), sounding more natural but only working well in specific keys.
How do I convert Hz to a musical note?
Use the formula: semitones from A4 = 12 × log₂(freq/440). Round to the nearest integer to find the closest note. This calculator handles the math and shows the deviation in semitones.
What is wavelength and why does it matter?
Wavelength is the physical length of one sound wave cycle. At 440 Hz in air (343 m/s), wavelength is about 78 cm. It matters for room acoustics, speaker placement, and understanding bass frequencies.
