432 Hz is 32 cents flat of A4 (440 Hz). It is close to A4 but 8 Hz lower. Some producers and musicians prefer 432 Hz tuning, though standard tuning is 440 Hz.

How do I tune an 808 to my track?

First, find the key of your track using BeatKey (beatkey.app). Then use the Note Frequency Calculator to look up the Hz for the root note in the relevant octave (usually octave 1 or 2 for 808s). Tune your 808 sample or synth to match that Hz. For example, if your track is in F# minor, tune your 808 to F#1 = 46.25 Hz.

Note Frequency Calculator

Q: What frequency is A4?

A4 is 440 Hz in standard tuning. A4 is the A above middle C and the universal tuning reference for orchestras, pianos, and electronic instruments.

Q: What frequency is middle C?

Middle C (C4) is 261.63 Hz. It is the C in the middle of the piano keyboard and is the central reference point for musical notation.

Convert note names to Hz, or find which note matches a frequency. Free, instant, no signup.

Start from a real workflow

Pick a common music task instead of starting from a blank calculator.

Each card also points to a deeper guide.

Enter a note name

Supports sharps (#), flats (b), and octaves 0-8. Examples: A4, C#3, Bb5, F2, G#1

Quick Reference - Octave 4 (Middle)

Piano Frequency Chart

All natural notes (no sharps) for octaves 1-6. Click any note to look it up.

Note	Hz	MIDI
C1	32.703	24	look up
D1	36.708	26	look up
E1	41.203	28	look up
F1	43.654	29	look up
G1	48.999	31	look up
A1	55.000	33	look up
B1	61.735	35	look up
C2	65.406	36	look up
D2	73.416	38	look up
E2	82.407	40	look up
F2	87.307	41	look up
G2	97.999	43	look up
A2	110.00	45	look up
B2	123.47	47	look up
C3	130.81	48	look up
D3	146.83	50	look up
E3	164.81	52	look up
F3	174.61	53	look up
G3	196.00	55	look up
A3	220.00	57	look up
B3	246.94	59	look up
C4 middle C	261.63	60	look up
D4	293.66	62	look up
E4	329.63	64	look up
F4	349.23	65	look up
G4	392.00	67	look up
A4 standard tuning ref	440.00	69	look up
B4	493.88	71	look up
C5	523.25	72	look up
D5	587.33	74	look up
E5	659.26	76	look up
F5	698.46	77	look up
G5	783.99	79	look up
A5	880.00	81	look up
B5	987.77	83	look up
C6	1046.50	84	look up
D6	1174.66	86	look up
E6	1318.51	88	look up
F6	1396.91	89	look up
G6	1567.98	91	look up
A6	1760.00	93	look up
B6	1975.53	95	look up

What is Note Frequency?

Every musical note corresponds to a specific frequency measured in Hz (cycles per second). The standard reference is A4 = 440 Hz. From there, each octave up doubles the frequency (A5 = 880 Hz), and each octave down halves it (A3 = 220 Hz). Within an octave, the 12 semitones are equally spaced on a logarithmic scale using the formula: Hz = 440 x 2^((MIDI - 69) / 12).

How to Tune an 808 Using Note Frequencies

Find the key of your track using BeatKey (free, browser-based).
Look up the root note of your key in octave 1 or 2 (where 808s live). For example, F# minor: look up F#1 = 46.25 Hz or F#2 = 92.50 Hz.
Tune your 808 sample's pitch until it matches that Hz reading.
In your DAW, most samplers show the pitch in semitones relative to the root note of the sample.
Use the Note Frequency Calculator to find the target Hz, then adjust semitones until your pitch meter reads that frequency.

Common Reference Frequencies for Producers

Note	Hz	Use Case
A0	27.50	Lowest note on a standard piano
C2	65.41	Deep 808 hits, sub-bass kicks
E2	82.41	Open low E string (guitar)
C4	261.63	Middle C, piano center reference
A4	440.00	Standard tuning reference (orchestras, DAWs)
A4 (alt)	432.00	432 Hz alternate tuning used by some artists
A5	880.00	High A, overtone harmonics, string instruments
C8	4186.01	Highest note on a standard piano

Frequently Asked Questions

What frequency is A4?

A4 is 440 Hz. This is the universal tuning standard used by orchestras, pianos, and virtually all digital audio workstations. When you tune a guitar or piano, A4 = 440 Hz is the reference point.

What note is 432 Hz?

432 Hz is 32 cents flat of A4 (440 Hz). It is close to A4 but does not correspond exactly to any standard note. Some producers and musicians prefer 432 Hz tuning as an alternative, though standard tuning is 440 Hz.

What frequency is middle C?

Middle C (C4) is 261.63 Hz. It is the C in the center of the piano keyboard, at MIDI note 60, and is the central reference point for music notation and octave numbering.

What is the difference between Hz and MIDI?

Hz (Hertz) is the physical frequency of a sound wave. MIDI is a numbered scale from 0-127 used in digital music software. MIDI 69 = A4 = 440 Hz. Every semitone up or down is one MIDI number. Hz changes exponentially (each octave doubles Hz), while MIDI numbers change linearly (12 per octave).