Note

Note number above middle C
x 
Frequency (Hz)
y 
Ratio

Middle C

0

262
 0 
C#

1

277
 .946 
D

2

294
 .942 
D#

3

311
 .946 
E

4

330
 .942 
F

5

349
 .946 
F#

6

370
 .942 
G

7

392
 .946 
G#

8

415
 .942 
A

9

440
 .946 
A#

10

466
 .942 
B

11

494
 .946 
C above middle C

12

523
 .942 
To find the ratio you have to average the two ratios you have.