Hertz to Note Calculator

Convert frequency in Hertz (Hz) to musical notes on the standard 12-tone equal temperament scale

Input Parameters

Calculation Results

Calculation Results

Click "Calculate" to see results

Calculation Formula

Note = 440 Hz × 2(n/12), where n is the note number

Where:
- 440 Hz is the reference frequency (A4 note)
- n is the note number in the chromatic scale (0=CY, 1=C#, 2=D, etc.)
- The formula calculates the nth semitone above the reference note

Hertz to Note Calculator Usage Guide

Learn how to use the Hertz to Note Calculator calculator and its working principles

How to Use This Calculator

  1. Enter the frequency in Hertz (Hz) that you want to convert to a musical note.
  2. Click the "Calculate" button to determine the corresponding musical note and octave.
  3. The calculator will display the detected note, its frequency, the closest MIDI note number, and the calculation details.

Understanding the Principle

This calculator uses the standard 12-tone equal temperament scale, where each octave doubles the frequency of the note below it. The formula used is:

Note = 440 Hz × 2(n/12)

Where n is the number of semitones away from the reference note (A4 = 440 Hz, which is assigned MIDI note number 69). By calculating the logarithm of the ratio between the input frequency and the reference frequency, we can determine how many semitones away the note is from A4.

Practical Applications

  • Translating sound recordings into musical notes
  • Calibrating musical instruments
  • Acoustic analysis and measurement
  • Electronic music production

Example

If you enter 440 Hz, the calculator will show that it corresponds to A4 (MIDI note 69). If you enter 880 Hz, it will show A5 (MIDI note 81), which is one octave higher.