Enter an interval frequency ratio like the just perfect fifth 3/2, where 3 is the numerator (top box) and 2 is the denominator (bottom) box. Typical values include 4/3, 3/4, 5/4, 81/64, 3/1, 442/440, 1.618/1, etc. Once you have entered the numerator and denominator of the frequency ratio, click the Convert to Cents button.

Cents:

Decimal equivalent:

Reginald Bain, Ratio to Cents, v2.03