Frequency to Note Converter | Hz to Musical Note Instant Lookup

A frequency to note converter translates any sound frequency — measured in Hertz (Hz) — into its corresponding musical note name, octave number, and tuning offset in cents. Type any Hz value and the converter instantly tells you which note it represents, which octave it falls in, and how far it sits from the mathematical center of that note.

This tool is used by musicians identifying notes from raw frequency data, singers checking whether a specific Hz value matches a target note, audio engineers mapping spectrum readings to musical context, and producers working between raw signal data and musical notation.

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How to Use the Frequency to Note Converter

1. Type any frequency value into the Hz input field (e.g., 440, 261.63, 523.25)
2. The converter instantly displays the nearest musical note name and octave number
3. The cents meter shows how far your input frequency sits from the exact mathematical center of that note — 0 cents is perfect, positive is sharp, negative is flat
4. Adjust your input to explore neighboring notes and frequencies
5. To go the other direction — note name to Hz — use the note to frequency converter

For live microphone-based frequency detection (rather than manual Hz entry), use the frequency detector which reads your microphone input and displays the Hz value in real time.

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Hz to Note Converter — Common Reference Frequencies

The table below shows standard note frequencies across the most commonly used octaves, based on the international A4 = 440 Hz tuning standard. Use it as a quick reference when you have a Hz value and need to identify the note, or when you want to verify what the converter is showing you.

Note	Octave 2	Octave 3	Octave 4	Octave 5	Octave 6
C	65.41 Hz	130.81 Hz	261.63 Hz	523.25 Hz	1,046.50 Hz
D	73.42 Hz	146.83 Hz	293.66 Hz	587.33 Hz	1,174.66 Hz
E	82.41 Hz	164.81 Hz	329.63 Hz	659.25 Hz	1,318.51 Hz
F	87.31 Hz	174.61 Hz	349.23 Hz	698.46 Hz	1,396.91 Hz
G	98.00 Hz	196.00 Hz	392.00 Hz	783.99 Hz	1,567.98 Hz
A	110.00 Hz	220.00 Hz	440.00 Hz	880.00 Hz	1,760.00 Hz
B	123.47 Hz	246.94 Hz	493.88 Hz	987.77 Hz	1,975.53 Hz

A4 = 440 Hz is the international concert pitch standard — the reference point from which all other frequencies are calculated. Every note in the table above is derived from A4 using the equal temperament formula. For background on why A440 became the standard and how it was adopted globally, see the A440 tuning standard explained guide.

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How the Frequency to Note Conversion Works

Every musical note in the standard Western equal temperament system has a mathematically defined frequency. The relationship between notes is logarithmic — each semitone step multiplies the frequency by the twelfth root of two (approximately 1.05946). This means doubling a frequency raises the pitch by exactly one octave.

The conversion formula the tool uses is the standard MIDI note formula:

n = 69 + 12 × log₂(f / 440)

Where:

• f = your input frequency in Hz
• n = the MIDI note number (69 = A4)
• The nearest integer value of n gives the note name and octave
• The fractional remainder, converted to cents (×100), gives the tuning offset

For example, entering 432 Hz: the formula gives n = 68.76, which rounds to 69 (A4) with −24 cents — meaning 432 Hz is 24 cents flat of A4. This is the basis of the A432 vs A440 debate: the same note name, different tuning reference, with a measurable cent deviation between them.

For a plain-language explanation of why musical pitch is measured logarithmically rather than linearly, the frequency vs note vs octave breakdown covers the concept clearly. For the full mathematical explanation of how Hz relates to what we perceive as pitch, see the guide on the difference between pitch and frequency.

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Convert Frequency to Musical Note — Use Cases

Singers and vocal coaches A singing voice produces a specific Hz value at every moment. When you use a voice pitch analyzer and see a frequency like 349 Hz in the readout, this converter instantly tells you that’s F4. This bridges the gap between the raw Hz data your microphone captures and the note names you recognize from music.

Instrument tuning and intonation When an instrument reads slightly off pitch, the frequency value tells you how far off it is, but the note name tells you what it should be. Converting Hz to note name helps you understand whether a reading of 442 Hz means you’re 8 cents sharp of A4 — useful context for fine intonation work. For dedicated instrument tuning with visual needle feedback, use the instrument tuner.

Audio engineers and producers Spectrum analyzers, EQ plugins, and DAW displays often show frequencies in Hz. When a problematic resonance appears at 311 Hz, knowing that’s approximately Eb4 (Eb is the note, 4 is the octave) helps you identify whether it’s a room mode, a string resonance, or a vocal formant. The converter makes spectrum data immediately musical rather than purely technical.

Music theory and ear training Understanding which Hz values correspond to which notes builds a stronger mental model of the frequency spectrum. For ear training focused on recognizing intervals and note relationships by ear rather than by frequency, the interval ear training page has dedicated exercises that pair well with frequency-to-note study.

Sound design and synthesis Synthesizers and oscillators are often set by Hz values rather than note names. Converting between the two is essential when building patches that need to sit at a specific pitch relative to a musical key or scale.

Speech and voice research Speaking voices also produce fundamental frequencies — the average male speaking voice sits around 85–180 Hz (roughly E2–F#3), while the average female speaking voice sits around 165–255 Hz (roughly E3–B3). Converting these Hz values to note names gives clinically useful context for voice therapists and speech researchers.

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What the Cents Offset Tells You

The cents display in the converter shows how far your input frequency sits from the exact mathematical center of the nearest note. This is the same measurement used in the pitch accuracy checker and the voice pitch analyzer.

0 cents — your frequency is exactly at the mathematical center of the note. Perfect tuning.

Positive cents (+) — your frequency is sharp of the note center. +50 cents means you’re exactly halfway between this note and the next semitone above.

Negative cents (−) — your frequency is flat of the note center. −50 cents means you’re exactly halfway between this note and the semitone below.

±100 cents — one full semitone. The converter will have already rounded to the next note before this point.

Professional performers and studio recordings typically sit within ±10 cents of the note center. Beyond ±20 cents, most listeners begin to notice tuning issues. For the full explanation of the cents system and why it exists as a unit, see what cents mean in music tuning.

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Frequency Ranges by Voice Type and Instrument

Understanding where your Hz value falls in the musical spectrum tells you a lot about the source. Here’s a quick reference:

Singing voices (fundamental frequency range):

• Bass: E2–E4 (82 Hz – 330 Hz)
• Baritone: A2–A4 (110 Hz – 440 Hz)
• Tenor: C3–C5 (131 Hz – 523 Hz)
• Mezzo-Soprano: A3–A5 (220 Hz – 880 Hz)
• Soprano: C4–C6 (262 Hz – 1,047 Hz)

Common instruments (fundamental frequency range):

• Bass guitar: E1–G4 (41 Hz – 392 Hz)
• Guitar: E2–E6 (82 Hz – 1,319 Hz)
• Piano: A0–C8 (27.5 Hz – 4,186 Hz)
• Violin: G3–A7 (196 Hz – 3,520 Hz)
• Flute: C4–D7 (262 Hz – 2,349 Hz)

For a complete instrument and voice frequency reference chart, see frequency ranges for instruments and voices.

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Tuning Standards — A440 vs A432 vs A442

The converter defaults to A4 = 440 Hz — the ISO 16 international standard adopted in 1955 and used by virtually all modern recording, broadcast, and performance contexts. However, different tuning references are used in specific situations:

A4 = 440 Hz — universal standard for pop, rock, film, broadcast, and most classical recording

A4 = 442 Hz — used by some European orchestras for a slightly brighter string tone. At 442 Hz, A4 is approximately +8 cents sharp of the 440 standard.

A4 = 432 Hz — a historical and alternative tuning preferred by some musicians who find it warmer. At 432 Hz, A4 is approximately −32 cents flat of the 440 standard — a clearly audible difference when the two are played simultaneously.

A4 = 415 Hz — used for Baroque period performance practice, approximately one semitone below modern pitch.

When converting Hz values recorded or measured against a non-440 reference, the note name and cents offset the tool displays will reflect the 440 baseline. For context on the history of tuning standards and why these differences exist, see historical pitch standards.

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Frequently Asked Questions

What is a frequency to note converter? A frequency to note converter is a tool that takes any sound frequency value in Hertz (Hz) and translates it into the corresponding musical note name, octave number, and cents deviation from perfect tuning. It makes raw frequency data immediately meaningful in musical terms — useful for musicians, singers, audio engineers, and producers.

What note is 440 Hz? 440 Hz is A4 — the A above middle C, and the international concert pitch reference. It’s the standard tuning note used across virtually all modern music, defined by ISO 16 in 1955.

What note is 432 Hz? 432 Hz is A4 at −32 cents — meaning it’s 32 cents flat of the standard A4 (440 Hz). It’s the same note name (A, fourth octave) but at a lower tuning reference used by some musicians as an alternative to 440 Hz.

What note is 528 Hz? 528 Hz falls between C5 (523.25 Hz) and C#5 (554.37 Hz), landing at approximately C5 +14 cents — slightly sharp of C5 but closer to C5 than to C#5.

What note is 396 Hz? 396 Hz falls closest to G4 (392.00 Hz) at approximately +18 cents — slightly sharp of G4.

What note is 174 Hz? 174 Hz is approximately F3 (174.61 Hz) at −6 cents — extremely close to the exact center of F3.

What note is 639 Hz? 639 Hz falls closest to Eb5 (622.25 Hz) at approximately +47 cents — almost exactly halfway between Eb5 and E5. Technically the nearest note is Eb5 but it’s very close to the boundary with E5.

How do I convert Hz to a note without a calculator? The full formula is n = 69 + 12 × log₂(f / 440). In practice, it’s far easier to use this converter — just type the Hz value and the result appears instantly. For the step-by-step manual method, see how to convert frequency Hz to musical notes.

What is the difference between Hz and cents? Hz measures the absolute vibration rate of a sound in cycles per second. Cents measure the relative distance between a specific frequency and the mathematical center of the nearest musical note — always a value between −50 and +50. Hz is an absolute measurement; cents is a relative one. For the full explanation, see what cents mean in music tuning.

Can I convert the other direction — note name to Hz? Yes. Use the note to frequency converter to type a note name (e.g., G#4) and get the exact Hz value.

What tuning standard does the converter use? A4 = 440 Hz by default — the international concert pitch standard. See the tuning standards section above for details on how different references (432, 442, 415 Hz) affect the conversion.