Obtain a fabric measuring tape or a piece of string to use as a measure. If using string, mark the dimensions on the string and then measure the dimensions using a steel tape measure.
Place the tape/string under the pig just behind the front legs and measure the circumference of the pig's girth in inches. This measurement is known as the Heart Girth
Then measure the Length of the pig along its back from the base of its ears to the base of its tail, again in inches.
To calculate the pigs weight, first square the Heart Girth to get the Girth Result.
Now multiply the girth result by the length and divide by 400.
You now have the weight of your pig in pounds.
Hudson the Pig has a Heart Girth of 50 inches and a length of 40 inches.
Squaring the Heart Girth (50 x 50) = 2500 = Girth Result
Multiply the Girth Result (2500) by the length (40) and divide by 400 = 250 pounds.