Horse Weight Calculator
Estimate your horse’s weight from two tape measurements.
Frequently asked questions
How do I measure heart girth?
Measure around the horse’s body just behind the front legs and over the withers. Use a flexible measuring tape and ensure it’s snug but not tight. The horse should be standing square on level ground.
How do I measure body length?
Measure from the point of the shoulder (front of the chest where it meets the leg) to the point of the buttock (the bony protrusion at the rear). Keep the tape level and straight for accurate results.
Which formula should I use?
The Standard formula (Girth² × Length ÷ 330) is widely used in North America. The Carroll & Huntington formula (Girth² × Length ÷ 301.5) was developed through UK research and may be more accurate for some horse types. Try both and compare results.
How accurate is this calculator?
Weight tape and formula estimates are typically accurate within 3–5% for average-sized horses. Results may vary for very young, very old, pregnant, or unusually proportioned horses. For precise weight, use a livestock scale.
Why is knowing my horse’s weight important?
Accurate weight is essential for calculating correct dosages of medications and dewormers, determining proper feed amounts, monitoring health changes, and ensuring safe trailering. Regular weight checks help detect early signs of illness or nutritional issues.