Note Frequency Calculator – Convert Notes and Frequencies Instantly

Convert notes to frequencies or frequencies to notes in real time with this free online note frequency calculator (based on A4 = 440 Hz tuning).

Note:

Octave:

Frequency (Hz):

Note Frequency Chart – Interactive Musical Pitch Table

Quickly find the frequency of any note or octave (with equal temperament) in this musical pitch table.

Oct → Note ↓	0	1	2	3	4	5	6	7	8	9	10
C	16	33	65	131	262	523	1047	2093	4186	8372	16744
C#	17	35	69	139	277	554	1109	2217	4435	8870	17740
D	18	37	73	147	294	587	1175	2349	4699	9397	18795
D#	19	39	78	156	311	622	1245	2490	4978	9956	19912
E	21	41	82	165	330	659	1319	2637	5274	10548	21096
F	22	44	87	175	349	698	1397	2794	5588	11175	22351
F#	23	46	93	185	370	740	1480	2960	5920	11840	23680
G	25	49	98	196	392	784	1568	3136	6272	12544	25088
G#	26	52	104	208	415	831	1661	3322	6645	13290	26580
A	28	55	110	220	440	880	1760	3520	7040	14080	28160
A#	29	58	117	233	466	932	1865	3730	7459	14917	29834
B	31	62	123	247	494	988	1976	3951	7902	15804	31609

Note Frequency Calculator FAQ

A note frequency calculator converts musical notes into precise frequencies (or vice versa), helping you tune instruments, design sounds, and match notes across tracks seamlessly.

What are notes, octaves & frequencies?

Frequency is the pitch of a sound; notes are distinct pitches (A, B, C, etc.), and octaves (1, 2, 3…) are the same notes at double or half their frequency. Explore more simple music theory.

What is A4 tuning (440 Hz)?

A4 tuning (440 Hz) is the standard reference pitch for music. All other notes are calculated from it.

What is equal temperament tuning?

Equal temperament tuning divides an octave into 12 equal steps, so all notes are spaced evenly in frequency.

How to find the frequency of a musical note?

Select a note and octave in the calculator, then read the value in the “Frequency” field.

How to find the musical note of a frequency?

Enter a frequency value in the calculator to see its corresponding note and octave.

How to calculate note frequencies for any octave manually?

To go up an octave, double a note’s frequency. To go down, halve it. For example, A4 = 440 Hz, so A5 = 880 Hz and A3 = 220 Hz.