Estimating your Pig's Weight without a Scale

G x G x L / 400 = W

Take the heart-girth measurement (just behind the front legs)
ALL THE WAY AROUND THE PIG.

Multiply that by itself.
Then multiply THAT times the length of your pig {top of the head between the ears to the start of the tail}

Divide the result by 400.

You will have a weight accurate to within 3%.

Example:
30in x30in (heart-girth measurement) x 40in (length of piggy)
divide by 400 = 90 pounds