Horse Weight & Body-Condition Calculator
Two tape-measurements give you a solid weight estimate — then add a body-condition score for an ideal-weight target and a daily forage range.
Your horse's estimated weight
A good starting point, not veterinary advice. Body-condition scoring is most reliable done hands-on by an experienced eye, and any feeding change should be gradual.
How the horse weight formula works
With a soft tape measure, take the heart girth (full circumference around the barrel, just behind the withers and elbow) and the body length (point of shoulder to point of buttock), both in inches. The estimate is:
weight (lb) = (heart girth² × body length) ÷ 330
The 330 divisor is for an adult horse; yearlings (301), weanlings (280) and ponies (299) use a slightly different divisor (the tool picks it for you). This girth-and-length formula is more accurate than a stick-on "weight tape" (which uses girth alone) and usually lands within about 5–10% — but a walk-on scale is the gold standard, the formula reads low for draft and heavy-boned breeds, and it's unreliable for heavily pregnant mares or unusual conformation. Re-measure at the same time of day (morning, before feeding) to track changes over time.
The Henneke body-condition score (1–9)
Weight alone doesn't tell you if your horse is in good shape — a 1,100 lb horse can be ribby or cresty. The Henneke scale rates fat cover at six spots — score them by sight and by feel: neck/crest, withers, behind the shoulder, over the ribs, along the loin/back, and the tailhead. Use your hands — a winter coat or heavy muscling can hide fat, and the score reflects fat cover, not muscle. A 5 is ideal for most horses (4–6 is healthy).
| Score | Condition | What you feel |
|---|---|---|
| 1–3 | Too thin | Ribs, spine and hip bones easily visible; little to no fat cover. Have your vet rule out teeth, parasites and illness, then build calories slowly. |
| 4 | Slightly thin | A faint ridge along the back; ribs faintly visible. Often fine for hard-working horses. |
| 5 | Ideal | Ribs not visible but easily felt; back is level; no crest. The target for most horses. |
| 6 | Slightly heavy | A little fat over the ribs and a slight crest. Watch the calories. |
| 7–9 | Too heavy | Ribs hard to feel, a firm crest, fat pads behind the shoulder and around the tailhead. Higher laminitis and metabolic risk — reduce calories gradually and add controlled exercise with your vet. |
