Estimating animal weight with the weight calculator

Use a Weight Calculator when you need a weight and can't use a scale. Take two tape measurements, and the result shows the estimated weight in pounds and kilograms.

There are calculators for Highland cattle, cattle, sheep, goats, horses, ponies, donkeys, alpacas, llamas, and pigs. They are free, and you don't need an account.

Take the measurements

Stand the animal square on level ground. Keep the tape snug, but don't pull it into the body. The drawing at the top of each calculator shows where to measure.

1. Choose Inches or Centimeters under Unit of Measurement.
2. Measure Heart Girth (C). Wrap the tape around the body just behind the front legs. For cattle, horses, and ponies, pass it over the withers (the top of the shoulders).
3. Measure Body Length (A-B). For most animals, go from the point of the shoulder (A) to the pin bone, or point of the buttock (B).
4. Select Calculate Weight.

Pigs are measured a little differently. For Body Length (A-B), go from between the ears (A) to the base of the tail (B).

For Highland cattle, sheep, alpacas, llamas, and other animals with a thick coat or fleece, press the hair down. The tape should follow the body, not the outer coat.

Read the estimate

Estimated Weight shows the result in pounds and kilograms. Below it, you'll see the two measurements and the formula used for that species.

For cattle and Highland cattle, a Weight Tape Comparison may also appear. That number uses heart girth alone and assumes average cattle proportions. If the two numbers are far apart, measure again. It doesn't mean either one is exact.

Further down the page, Measurement Tips adds advice for that species. Typical Weight Ranges lists common weights, so you can tell if a result looks off.

Know the limit

This is an estimate, not a measured weight. It can be off by 5 to 10%. Body condition, breed shape, coat, pregnancy, posture, and how you measured can all change the result. If the number seems surprising, measure again.

Use a scale when an exact weight matters, such as for medicine, anesthesia, transport safety, or feed plans. Ask your veterinarian about doses and health questions.

Weight and value answer different questions. To see what similar animals sell for at auction, see Check market prices with the Livestock Value Calculator. A weight can also help when you request transport or set up boarding.

Related information

• The Creatures Tools page: which free tool to use
• Check market prices with the Livestock Value Calculator
• Requesting transport for an animal

Updated on: 29/10/2026