1,000,000,000,000,000,100,000,000,000,000,000,000,000 ffl oz
1 Yfl oz (Yottaounce) is equal to 1,000,000,000,000,000,100,000,000,000,000,000,000,000 ffl oz (Femtoounce). To convert from Yottaounce to Femtoounce, multiply by 1,000,000,000,000,000,100,000,000,000,000,000,000,000 or divide by 0.000000000000000000000000000000000000001.