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Formula(Heartgirth X Heartgirth X Body Length) / 330 = Horse’s Weight For those smaller or younger than a mature horse, substitute the 330 for 301 (yearling), 280 (weanling), and 299 (pony).
SuppliesMeasuring tape with inches, calculator, and helper
- Measure for the length by asking your helper to hold the tape at the point of your horse’s shoulder. Run the tape straight along his side and stop at the point of his rear. Plug this number into body length.
- Place the starting point of the tape at your horse’s wither. Run the tape around his girth area by staying as close as possible to his elbow. Bring the tape all the way around to meet back at the wither. Plug this number in as the heartgirth.
- Complete the math. Don’t forget to include the heartgirth twice. Remember this is just an estimate.