How big is 1 yocto? 1 yocto is a prefix that is equal to 10 to the power of negative twenty-four.
1 yocto = 10-24
It is a 1 preceded by 23 zeros, a decimal point, and another zero.
1 yocto = 0.000000000000000000000001
Below are a few examples of the word yocto being used as a prefix for meter and second.
1 yoctometer = 0.000000000000000000000001 m
1 yoctosecond = 0.000000000000000000000001 s