Horse weight estimator

You measure the heart girth (around the chest, just behind the withers, at the girth line) and the body length (from the point of the shoulder to the point of the buttock), then apply the formula: weight (kg) = heart girth² × length ÷ 11877. That's what this tool does automatically.

The measurement method is accurate to about ±5-10% of the real weight. That's enough to adjust a ration, dose a dewormer or track weight changes, but less precise than a weighbridge.

With a flexible measuring tape, around the chest just behind the withers and elbows, at the girth line. The horse must stand square and balanced on all four legs, on flat ground.

Yes: choose the build (pony, riding horse or draught horse) and the calculation is weighted accordingly, same formula but with an adjusted divisor (a pony has a rounder barrel, a draught horse much denser bone). The estimate stays calibrated for the adult animal: foals, pregnant mares and special cases require a dedicated estimate, ask your vet for advice.

To calculate its ration precisely, to dose dewormers and some medicines correctly (often prescribed by weight), and to track its body condition over time (weight gain or loss).