Yoctometre (American spelling: yoctometer, symbol: ym) is an SI measure of length that is equal to 10^-24 (yocto) of a metre. A yoctometer is 1/100 the diameter of an electron, and 1/100 000 the diameter of a proton or neutron.

• 1 ym = 1 × 10^-24 metre

Planck length << yoctometre << zeptometre

See also

• 1 E-24 m
• SI
• SI prefix
• Orders of magnitude