1 petanewton is equal to 1,000,000,000,000,000,100,000,000,000,000,000,000,000 yoctonewton. To convert from petanewton to yoctonewton, multiply by 1,000,000,000,000,000,100,000,000,000,000,000,000,000 or divide by 0.000000000000000000000000000000000000001.