25/18

Interval information

Ratio	25/18
Factorization	2-1 × 3-2 × 52
Monzo	[-1 -2 2⟩
Size in cents	568.7174¢
Names	classic augmented fourth, pental augmented fourth
Color name	yy4, yoyo 4th
FJS name	[math]\displaystyle{ \text{A4}^{25} }[/math]
Special properties	reduced
Tenney norm (log2 nd)	8.81378
Weil norm (log2 max(n, d))	9.28771
Wilson norm (sopfr(nd))	18
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25/18, the classic augmented fourth, is a 5-limit tritone that is 325/324 (5.3 cents) sharp of 18/13, and is the interval between 6/5 and 5/3 or 9/5 and 5/2 respectively.

See also

• 36/25 – its octave complement
• Gallery of just intervals