Frequency to Note Calculator
Convert a sound frequency in Hz to the nearest musical note, octave, and cents offset.
How to Use the Frequency to Note Calculator
- Enter the frequency in Hz (e.g. 440 for A4).
- Click Calculate to see the musical note and octave.
- Check the cents offset to see how in-tune the frequency is.
- Use the nearest note frequency for precise tuning reference.
Use Cases
- •Tuning musical instruments by frequency.
- •Identifying notes from audio analysis tools.
- •Checking synth oscillator or sample pitch.
- •Learning music theory and the physics of sound.
Formula
n = 12 × log₂(f / 440) + 69. Note = n mod 12. Octave = floor(n / 12) − 1. Cents offset = (n − round(n)) × 100.
Frequently Asked Questions
What is A440?
A440 is the standard concert pitch where the A above middle C is tuned to 440 Hz.
What are cents?
Cents measure the difference between two frequencies. 100 cents = 1 semitone. Positive cents = sharp, negative = flat.
Is it free?
Yes, all calculators on OhMyCalc are completely free.