1 EF (Exafarad) is equal to 999,999,999,999,999,900,000,000,000,000,000,000,000,000 yF (Yoctofarad). To convert from Exafarad to Yoctofarad, multiply by 999,999,999,999,999,900,000,000,000,000,000,000,000,000 or divide by 0.000000000000000000000000000000000000000001.