Note Frequency Calculator
Find the frequency of a note a number of semitones from A4.
Compare Your Options And Get Clear Answers
Find the frequency of a note a number of semitones from A4.
Note Frequency Estimator
Enter your numbers below for an instant estimate.
How It Works
Key concepts behind this calculator
Enter Values
Fill in each field with your own numbers.
Calculate
Results update as you change the inputs.
Review
Read the breakdown and the explanation.
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Note Quick Guide
Typical values for reference.
| Semitones from A4 | A4 tuning (Hz) | Octaves shift | Frequency |
|---|---|---|---|
| 3 | 440 | 0 | 523 Hz |
| -9 | 440 | 0 | 262 Hz |
| 12 | 440 | 0 | 880 Hz |
| 0 | 440 | -1 | 220 Hz |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Note Frequency Calculator FAQ
Answers to common questions about this calculator.
It uses the formula shown with your inputs. Real conditions vary, so treat it as a guide.
Middle C is 9 semitones below A4.
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.
Yes. Replace each input with your own figures and the result updates instantly.