Note to Frequency Converter
Convert musical notes to frequencies in Hz and vice versa. Supports all octaves and different concert pitches.
Note to Frequency Converter
Convert musical notes to frequencies and vice versa using equal temperament tuning.
Quick Select
Common Reference Frequencies
Formula (Equal Temperament):
f = 440 × 2^((n - 69) / 12)where n is the MIDI note number (A4 = 69)
How to Use
- 1Choose mode — Select whether you want to convert a note to frequency or frequency to note.
- 2Set reference pitch — Choose your reference pitch (A4 = 440 Hz is standard, but other tunings are available).
- 3Enter your value — Select a note and octave, or enter a frequency in Hz.
- 4View result — See the calculated frequency or the closest note with cents deviation.
- 5Copy if needed — Click the copy button to copy the result to your clipboard.
Frequently Asked Questions
What is A440?
A440 (also known as Stuttgart pitch) is the standard concert pitch where the note A above middle C (A4) is tuned to 440 Hz. This is the most common tuning standard used worldwide.
What are cents in music?
A cent is a unit of measurement for musical intervals. There are 100 cents in a semitone. If a note is 50 cents sharp, it is exactly halfway between two semitones.
What is equal temperament?
Equal temperament is a tuning system where the octave is divided into 12 equal semitones. Each semitone has a frequency ratio of 2^(1/12) ≈ 1.0595. This allows instruments to play in any key.
Why would I use a different reference pitch?
Some orchestras tune to A442 or A443 for a brighter sound. Baroque music is often performed at A415. Some musicians prefer A432 for its purported benefits, though this is debated.
What is the frequency range of human hearing?
Humans can typically hear frequencies from about 20 Hz to 20,000 Hz. Musical instruments generally produce fundamentals between 27.5 Hz (lowest piano note) and 4,186 Hz (highest piano note).