Horse Weight Calculator
Tools you might need next
Calculate daily horse hay and grain feeding requirements by body weight, workload, and life stage. Forage-first ration planning for equine nutrition.
Calculate minimum pasture and paddock acreage for horses by herd size and grazing system. Plan rotational grazing and dry lot dimensions.
Calculate English and Western saddle seat size and tree width from rider measurements and horse conformation. Guide for proper saddle fit.
Measure heart girth (inches) around the barrel behind the elbows. Measure body length (inches) from point of shoulder to point of buttock. Formula applies to adult horses.
Weight (lb) = (Heart girth² × Body length) ÷ 330Same relationship in metric units. Results within 5% of scale weight when measurements are taken consistently.
Weight (kg) = (Girth cm² × Length cm) ÷ 11,900Weight tapes read girth only. Draft breeds run heavier; Thoroughbreds lighter for same girth. Adjust estimates for body condition score extremes.
Tape reading ± breed factor (±5–10%)Updated: July 2026
Heart girth 74 in, body length 68 in estimates 1,050 lb — use for accurate ivermectin tube selection rather than guessing 'average horse' at 1000 lb.
Two horses estimated at 1,100 lb and 950 lb total 2,050 lb — verify against trailer GAWR and tow vehicle limits.
Monthly remeasurement shows weight increased from 980 to 1,020 lb — recalculate hay ration at 1.5% body weight (15.3 lb/day).
Accurate horse weight is essential for dewormer dosing, feed rationing, and trailer load limits — but most owners lack access to a livestock scale. Enter heart girth and body length measurements to estimate body weight using the validated equine weight formula.