The most accurate method for estimating a horse’s weight using a weight tape is the formula method, which requires two measurements be made in inches. When a weight scale is not available or practical, the formula method is the method of choice.
- First, measure heart girth and body length as indicated below.
- Second, estimate the horse’s body weight using the appropriate weight formula as indicated below.
- Third, to monitor progress over time, measure the horse at the same time of day for greater accuracy, ideally in the morning before feeding.
Measuring the Horse
- Hearth Girth: Measure around the horse’s girth by placing tape across the highest part of the withers and keeping the tape as close behind the elbows as possible. Measure in inches.
- Body Length: Use two people to measure from the point of the shoulder, straight back along the horse’s side to the point of the buttock. Measure in inches.
Equine WEIGHT Formulas (In Inches)
- Adult Horse: (Heart Girth x Heart Girth x Body Length) /330 = Bodyweight in pounds
- Yearling: (Heart Girth x Heart Girth x Body Length) /301= Bodyweight in pounds
- Weanling: (Heart Girth x Heart Girth x Body Length) /280= Bodyweight in pounds