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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