Note to Frequency Converter
Instantly convert any musical note and octave into its precise frequency in Hertz (Hz). Perfect for music producers, sound designers, and students.
Convert Musical Notes to Hz Instantly
Enter any musical note (A4, C3, or F#5) to get its exact frequency in Hertz. Fast, accurate, and privacy-safe — perfect for musicians, vocalists, and sound learners.
Quick Examples
Batch Mode
How to Use the Results
Once you have the exact frequency, you can use it to perfect your music in a variety of powerful ways.
For Music Producers
Tune your 808s, kicks, and synth basses to the precise frequency of a song’s root note. This creates a clean, powerful, and professional low-end in your mix.
For Ear Training
Set a tone generator to the exact target frequency to practice matching pitch. This is a perfect way for singers and instrumentalists to improve their intonation.
For Sound Design
Dial in your synth oscillators and virtual instruments to the exact frequency for any note, helping you create perfectly tuned sounds from scratch.
For Music Theory
Visualize the mathematical relationship between notes. See exactly how the frequency doubles with each octave and explore the logic of 12-TET tuning.
Understanding the Details Note to Frequency Converter
Learn more about the key concepts that power this converter and modern music tuning.
A4 Calibration (440 vs 442 Hz)
While A4 = 440 Hz is the global ISO standard for tuning, many professional orchestras prefer a slightly sharper A4 = 442 Hz for a perceived “brighter” sound in concert halls.
Changing the A4 reference shifts the absolute frequency of every note, but the relative intervals between them remain the same. Our tool allows you to select the correct standard for your context. See our technical methodology for more.
12-TET & Enharmonic Notes
All calculations are based on 12-Tone Equal Temperament (12-TET), the tuning system for most modern music. It divides the octave into 12 perfectly equal semitones.
In this system, notes like C# and Db are “enharmonically equivalent”—they represent the same key on a piano and thus have the exact same frequency.
Converter Questions
Here are some of the most common questions about converting musical notes to frequencies.
MIDI (Musical Instrument Digital Interface) assigns a unique number to each note. Middle C (C4) is MIDI number 60, C#4 is 61, etc. It provides a simple, numerical way to represent notes, which is extremely useful in digital audio workstations (DAWs) and synthesizers.
This tool uses standard Scientific Pitch Notation, where Middle C is C4. Be aware that some systems, like certain keyboards, may refer to Middle C as C3. Our converter supports a wide range, from octave -1 to 9.
Yes. In 12-Tone Equal Temperament (the system used by this tool), enharmonic notes like C# and Db represent the exact same pitch and therefore have the identical frequency. Our tool correctly handles both sharps (#) and flats (b) in the text input.
Changing the A4 reference (e.g., from 440 Hz to 442 Hz) shifts the frequency of every note proportionally. The mathematical intervals between notes remain the same, but their absolute frequencies will all be slightly higher or lower. This is crucial for matching the tuning of a specific orchestra or ensemble.
Frequency is the physical measurement of a note’s pitch. Understanding the specific frequency of notes is essential for tuning instruments accurately, designing sounds in synthesizers, and ensuring that all musical elements in a mix are harmonious and free of clashing tones.
Have more questions? Visit our full FAQ page.