How to use the frequency of musical notes calculator
Find the frequency of a note from its distance from A4. Enter semitones from a4, reference a4 in the fields above; the frequency, wavelength in air are computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- n — Semitones from A4
- f0 — Reference A4 (Hz)
Worked example
With semitones from a4 = 3, reference a4 = 440 Hz, the calculator gives frequency ≈ 523.2511 Hz; wavelength in air ≈ 0.655517 m.
Frequently asked questions
What is the formula for the frequency of musical notes calculation?
Frequency (Hz) = f0 × 2^(n / 12). Wavelength in air (m) = 343 / [Frequency]. Here n is semitones from a4, f0 is reference a4 (Hz).
What inputs do I need for the frequency of musical notes calculator?
You need semitones from a4, reference a4 in Hz. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.