Reference

Piano Note Frequencies

The equal-temperament frequency of every key on an 88-key piano, from A0 to C8, at A4 = 440 Hz.

Frequency chart for all 88 keys

Piano key frequencies at A4 = 440 Hz
Key	Note	Frequency (Hz)	MIDI
Octave 0
1	A0	27.50	21
2	A♯0 / B♭0	29.14	22
3	B0	30.87	23
Octave 1
4	C1	32.70	24
5	C♯1 / D♭1	34.65	25
6	D1	36.71	26
7	D♯1 / E♭1	38.89	27
8	E1	41.20	28
9	F1	43.65	29
10	F♯1 / G♭1	46.25	30
11	G1	49.00	31
12	G♯1 / A♭1	51.91	32
13	A1	55.00	33
14	A♯1 / B♭1	58.27	34
15	B1	61.74	35
Octave 2
16	C2	65.41	36
17	C♯2 / D♭2	69.30	37
18	D2	73.42	38
19	D♯2 / E♭2	77.78	39
20	E2	82.41	40
21	F2	87.31	41
22	F♯2 / G♭2	92.50	42
23	G2	98.00	43
24	G♯2 / A♭2	103.83	44
25	A2	110.00	45
26	A♯2 / B♭2	116.54	46
27	B2	123.47	47
Octave 3
28	C3	130.81	48
29	C♯3 / D♭3	138.59	49
30	D3	146.83	50
31	D♯3 / E♭3	155.56	51
32	E3	164.81	52
33	F3	174.61	53
34	F♯3 / G♭3	185.00	54
35	G3	196.00	55
36	G♯3 / A♭3	207.65	56
37	A3	220.00	57
38	A♯3 / B♭3	233.08	58
39	B3	246.94	59
Octave 4
40	C4	261.63	60
41	C♯4 / D♭4	277.18	61
42	D4	293.66	62
43	D♯4 / E♭4	311.13	63
44	E4	329.63	64
45	F4	349.23	65
46	F♯4 / G♭4	369.99	66
47	G4	392.00	67
48	G♯4 / A♭4	415.30	68
49	A4	440.00	69
50	A♯4 / B♭4	466.16	70
51	B4	493.88	71
Octave 5
52	C5	523.25	72
53	C♯5 / D♭5	554.37	73
54	D5	587.33	74
55	D♯5 / E♭5	622.25	75
56	E5	659.26	76
57	F5	698.46	77
58	F♯5 / G♭5	739.99	78
59	G5	783.99	79
60	G♯5 / A♭5	830.61	80
61	A5	880.00	81
62	A♯5 / B♭5	932.33	82
63	B5	987.77	83
Octave 6
64	C6	1046.50	84
65	C♯6 / D♭6	1108.73	85
66	D6	1174.66	86
67	D♯6 / E♭6	1244.51	87
68	E6	1318.51	88
69	F6	1396.91	89
70	F♯6 / G♭6	1479.98	90
71	G6	1567.98	91
72	G♯6 / A♭6	1661.22	92
73	A6	1760.00	93
74	A♯6 / B♭6	1864.66	94
75	B6	1975.53	95
Octave 7
76	C7	2093.00	96
77	C♯7 / D♭7	2217.46	97
78	D7	2349.32	98
79	D♯7 / E♭7	2489.02	99
80	E7	2637.02	100
81	F7	2793.83	101
82	F♯7 / G♭7	2959.96	102
83	G7	3135.96	103
84	G♯7 / A♭7	3322.44	104
85	A7	3520.00	105
86	A♯7 / B♭7	3729.31	106
87	B7	3951.07	107
Octave 8
88	C8	4186.01	108

How the frequencies are calculated

Modern pianos are tuned in equal temperament: each semitone is the same frequency ratio, the twelfth root of 2 (about 1.0595). Starting from A4 = 440 Hz, the frequency of any key n (1–88) is 440 × 2^((n − 49) / 12).

Each octave doubles the frequency, so A5 is 880 Hz and A3 is 220 Hz. Real pianos are tuned slightly "stretched": a little flat in the low bass and a little sharp in the high treble, because stiff strings have overtones that run sharp. The chart shows the theoretical values a tuner starts from.

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