Semitones from A4 to hertz
Type a value in semitones to get it in Hz instantly.
4.8×10¹³Hz
That's 11,466,211,813× as high as the top of a piano — nothing on our list beats it. That is about 440 semitones from concert A.
Convert the other way: Hz to semitones
What it means
What does that sound like?
Based on equal temperament with A4 at 440 Hz. Orchestras sometimes tune to 442 or 443, shifting everything slightly.
The math
How to convert semitones to Hz
Pitch is logarithmic: f = 440 × 2^((note − 69) ÷ 12). Every octave doubles the frequency and holds 12 semitones.
Example: 440 semitones = 4.8×10¹³ Hz.
Every unit
Your pitch in every unit
Tables
semitones to Hz conversion table
| semitones | Hz |
|---|---|
| 55 semitones | 10,548.1 Hz |
| 110 semitones | 252,868 Hz |
| 220 semitones | 145,324,000 Hz |
| 261.63 semitones | 1.609×10⁹ Hz |
| 330 semitones | 8.352×10¹⁰ Hz |
| 440 semitones | 4.8×10¹³ Hz |
| 523.25 semitones | 5.883×10¹⁵ Hz |
| 660 semitones | 1.585×10¹⁹ Hz |
| 880 semitones | 5.236×10²⁴ Hz |
| 1,760 semitones | 6.23×10⁴⁶ Hz |
Hz to semitones conversion table
| Hz | semitones |
|---|---|
| 55 Hz | -36 semitones |
| 110 Hz | -24 semitones |
| 220 Hz | -12 semitones |
| 261.63 Hz | -8.99971 semitones |
| 330 Hz | -4.98045 semitones |
| 440 Hz | 0 semitones |
| 523.25 Hz | 2.99996 semitones |
| 660 Hz | 7.01955 semitones |
| 880 Hz | 12 semitones |
| 1,760 Hz | 24 semitones |
Quick answers
Quick answers
- How many Hz is 1 semitones?
- 1 semitones is 466.164 Hz.
- How many Hz is 10 semitones?
- 10 semitones is 783.991 Hz.
- How many Hz is 440 semitones?
- 440 semitones is 4.8×10¹³ Hz.
The units
About these units
Semitones from A4 (semitones)
How many half-steps above or below concert A the note sits.
Hertz (Hz)
Cycles per second, the physical frequency of the note.
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