The result of your conversion between perch and square thou appears here
To convert between Perch and Square Thou you have to do the following:
First divide 25.29285264 / 6.4516E-10 = 39204000000.
Then multiply the amount of Perch you want to convert to Square Thou, use the chart below to guide you.
Symbol: perch
No description
Symbol: sq thou
No description