1 Ymol (yottamole) is equal to 1,000,000,000,000,000,100,000,000,000,000,000,000,000 fmol (femtomole). To convert from yottamole to femtomole, multiply by 1,000,000,000,000,000,100,000,000,000,000,000,000,000 or divide by 0.000000000000000000000000000000000000001.