Musical notes

Note frequency chart

Every note from C0 (16.35 Hz) to B8 (7,902 Hz) in standard A440 equal temperament. Click any value to hear it.

Frequencies in hertz

Octave	C	C♯	D	D♯	E	F	F♯	G	G♯	A	A♯	B
0	16.35	17.32	18.35	19.45	20.60	21.83	23.12	24.50	25.96	27.50	29.14	30.87
1	32.70	34.65	36.71	38.89	41.20	43.65	46.25	49.00	51.91	55.00	58.27	61.74
2	65.41	69.30	73.42	77.78	82.41	87.31	92.50	98.00	103.83	110.00	116.54	123.47
3	130.81	138.59	146.83	155.56	164.81	174.61	185.00	196.00	207.65	220.00	233.08	246.94
4	261.63	277.18	293.66	311.13	329.63	349.23	369.99	392.00	415.30	440.00	466.16	493.88
5	523.25	554.37	587.33	622.25	659.26	698.46	739.99	783.99	830.61	880.00	932.33	987.77
6	1,046.50	1,108.73	1,174.66	1,244.51	1,318.51	1,396.91	1,479.98	1,567.98	1,661.22	1,760.00	1,864.66	1,975.53
7	2,093.00	2,217.46	2,349.32	2,489.02	2,637.02	2,793.83	2,959.96	3,135.96	3,322.44	3,520.00	3,729.31	3,951.07
8	4,186.01	4,434.92	4,698.64	4,978.03	5,274.04	5,587.65	5,919.91	6,271.93	6,644.88	7,040.00	7,458.62	7,902.13

Why is A4 440 Hz?

A4 = 440 Hz was agreed internationally in 1939 and standardised as ISO 16 in 1975, ending centuries of local variation.

How do you calculate a note's frequency?

In equal temperament, f = 440 × 2^((n − 69)/12), where n is the MIDI note number.