Step 1 What is the total square foot area to be topdressed? Record that number in the box to the right (ex. 11000 square feet).
Do not use commas!

sq.ft. 
Step 2 What is your desired depth of topdressing in INCHES. Use decimal equivalent  Do not use fractions ( / sign) in the box!
Example:
1/2" = 0.5 in.
7/16" = 0.438 in.
3/8" = 0.375 in.
5/16" = 0.313 in.
1/4" = 0.25 in.
3/16" = 0.188 in.
1/8" = 0.125 in.
1/16" = 0.063 in.
1/32" = 0.031 in.

in. 
Step 3 What is the diameter in INCHES of your aerification tines? Use decimal equivalent  Do not use fractions ( / sign) in the box!
If you are not aerifying in conjunction with topdressing  simply leave box blank and the calculation will be done without aerification.
Example:
1/2" tines = 0.5 in.
3/8" tines = 0.375 in.
1/4" tines = 0.25 in.
3/16" tines = 0.188 in.

in. 
Step 4 What is the average depth in INCHES that your aerification tines penetrate into the soil? Use decimal equivalent  Do not use fractions ( / sign) in the box!
If you are not aerifying in conjunction with topdressing  simply leave box blank.

in. 
Step 5 How many cores per square foot are you creating with your aerifyer?
If you are not aerifying in conjunction with topdressing  simply leave box blank.

/sq.ft. 