A4 = 432 Hz

432 Hz tuner.

Tune any instrument to A = 432 Hz. Every note moves down about 32 cents from standard pitch: roughly a third of a half step.

Tuner · Any tuning

Tune your guitar.

Pluck a string and the meter shows how far off it is. Tap any string to hear it at its true pitch and tune by ear.

Pick any instrument and tuning
Shift it down or up by half steps
Set A to anything: 440, 432, 442…

E A D G B E · A = 432

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Keys: Space start or stop · ← → half step · ↑ ↓ A (Shift: bigger steps) · 1–9 string · M mode · R hear · − + volume · L copy link · Esc done

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−31.77 ¢ vs 440

What A = 432 changes

A4 = 432 Hz is −31.77 cents from 440. Every note moves by the same amount, so note names, chord shapes and tunings all stay the same; only the pitch moves. String tension changes by about −3.6% (approx.).

The tuner on this page starts at A = 432 for every instrument and tuning. Change it anytime with the A chip, and choose whether to keep 432 as your usual A4.

Guitar in standard tuning at A = 440 and A = 432 (Hz)
String	Note	A = 440	A = 432
6	E2	82.41	80.91
5	A2	110.00	108.00
4	D3	146.83	144.16
3	G3	196.00	192.43
2	B3	246.94	242.45
1	E4	329.63	323.63

History

The honest history

Standard pitch is A4 = 440 Hz. It was agreed at an international conference in London in 1939 and became the ISO 16 standard in 1955. Before that, pitch varied a lot from city to city, from about 435 to well over 450 Hz.

432 Hz became popular online in the 2000s and 2010s. Claims that it is healthier, more natural or "in tune with the universe" have no good evidence behind them, and the story that 440 Hz was imposed for sinister reasons is a myth. Verdi argued for a lower pitch in the 19th century, and his name is often linked to 432, but the official French standard of 1859 was 435 Hz.

So play at 432 if you like the sound or your band uses it. The one thing that matters is that everyone in the room tunes to the same A.

A4 = 432 Hz

Every note at A = 432

Equal-tempered note frequencies in Hz at A4 = 432, octaves 0 to 8
Note	0	1	2	3	4	5	6	7	8
C	16.05	32.11	64.22	128.43	256.87	513.74	1027.47	2054.95	4109.90
C♯ / D♭	17.01	34.02	68.04	136.07	272.14	544.29	1088.57	2177.14	4354.29
D	18.02	36.04	72.08	144.16	288.33	576.65	1153.30	2306.60	4613.21
D♯ / E♭	19.09	38.18	76.37	152.74	305.47	610.94	1221.88	2443.76	4887.52
E	20.23	40.45	80.91	161.82	323.63	647.27	1294.54	2589.07	5178.15
F	21.43	42.86	85.72	171.44	342.88	685.76	1371.51	2743.03	5486.06
F♯ / G♭	22.70	45.41	90.82	181.63	363.27	726.53	1453.07	2906.14	5812.28
G	24.05	48.11	96.22	192.43	384.87	769.74	1539.47	3078.95	6157.89
G♯ / A♭	25.48	50.97	101.94	203.88	407.75	815.51	1631.01	3262.03	6524.06
A	27.00	54.00	108.00	216.00	432.00	864.00	1728.00	3456.00	6912.00
A♯ / B♭	28.61	57.21	114.42	228.84	457.69	915.38	1830.75	3661.50	7323.01
B	30.31	60.61	121.23	242.45	484.90	969.81	1939.61	3879.23	7758.46

Questions

How do I tune to 432 Hz?

Use the tuner on this page: it is already set to A = 432. Pick your instrument, pluck each string and follow the meter: Low means tighten, High means loosen. For a guitar in standard tuning the targets are E2 80.91, A2 108.00, D3 144.16, G3 192.43, B3 242.45, E4 323.63 Hz.

Is 432 Hz better for health?

There is no good evidence for that. A few small studies exist, but none show a clear, repeatable benefit. Choose 432 because you like how it sounds, not for health reasons.

Will I be out of tune with other musicians?

With anyone at 440, yes: about 32 cents apart, which is clearly audible in chords. Recordings and keyboards are almost always at 440, so tune everyone in the group to the same A.