Srimad Bhagavatam Canto 12, Chapter 11, Text 09

SB 12.11.9

yavan ayam vai puruso
 yavatya samsthaya mitah
tavan asav api maha-
 puruso loka-samsthaya
 
Translation: 
 
Just as one can determine the dimensions of an ordinary person of this world by measuring his various limbs, one can determine the dimensions of the Mahapurusa by measuring the arrangement of the planetary systems within His universal form.
Srimad Bhagavatam Canto 12, Chapter 11, Text 06-08
Srimad Bhagavatam Canto 12, Chapter 11, Text 10