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Interval information
Ratio 8/3
Factorization 23 × 3-1
Monzo [3 -1
Size in cents 1698.045¢
Name perfect eleventh
Color name w11, wa 11th
FJS name [math]\text{P11}[/math]
Tenney height (log2 nd) 4.58496
Weil height (log2 max(n, d)) 6
Wilson height (sopfr (nd)) 9
Harmonic entropy
(Shannon, [math]\sqrt{nd}[/math])
~4.04762 bits

[sound info]
open this interval in xen-calc

8/3 is the ratio between the 3rd and 8th harmonics; one octave above 4/3. In non-microtonal music, it is often referred to as the perfect eleventh.