# Weighing a Pig Without a Scale

By thePigSite.com - Ever wondered how to weigh a pig without a scale? This article explains how you can obtain a good estimate of a pigs weight by measuring its girth and length and doing some simple math.

The most accurate way to measure the weight of a pig is to use a specialist pig weigh. However, these can be expensive and if you only have a few pigs to weigh and a high degree of accuracy is not necessarily needed, we explain how to obtain a good estimate of a pigs weight using only a measuring tape and a calculator.

To convert KILOGRAMMES to POUNDS multiply by 2.2

To convert POUNDS to KILOGRAMMES multiply by 0.455

#### IMPERIAL - Weight of your pig in POUNDS

- 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 pigs girth in inches. This measurement is known as the
*Heart Girth*(see graphic) - 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. (see graphic) - 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.

__Example:__- Porky 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.

#### METRIC VERSION - Weight of your pig in KILOGRAMMES

- Use the same procedure as above taking your measurement in
*Meters*.

Then use the following formula. - Square the
*Heart Girth*to get the*Girth Result*. - Now Multiply the
*Girth Result*by the*Length*and MULTIPLY by 69.3 - You now have the weight of your pig in Kg.

__Example:__- Porky Pig has a
*Heart Girth*of 1.27 meters and a*Length*of 1.02 meters. - Squaring the
*Heart Girth*(1.27 x 1.27) = 1.6129 =*Girth Result* - Multiply the
*Girth Result*(1.6129) by the*Length*(1.02) and MULTIPLY by 69.3 = 114 Kg.

#### CONVERSIONS

Alternatively use either procedure and convert the result to your chosen units.To convert KILOGRAMMES to POUNDS multiply by 2.2

To convert POUNDS to KILOGRAMMES multiply by 0.455

#### LIVEWEIGHT vs DEADWEIGHT

The above formula gives you the liveweight of your pig. The conversion from liveweight to deadweight can vary somewhat, however using a ratio of 72% will give a good approximation. Thus in our example Pork Pig would have a carcass weight of around 180 pounds (250 x 0.72) or 82 Kg.*Credit for the liveweight formula goes to the Old Farmer's Almanac.*