EquineCalc
Weight estimation, feed rations, pasture planning, and body condition assessment. Practical tools for responsible horse care.
Horse Weight Estimator
Estimate horse weight from heart girth and body length measurements.
Hay & Feed Ration Calculator
Calculate daily hay and feed requirements based on body weight and activity level.
Pasture Acreage Calculator
Calculate how much pasture you need based on number of horses and management style.
Body Condition Score Guide
Assess horse body condition on the 1–9 Henneke scale with visual descriptions.
About EquineCalc
EquineCalc is a suite of free calculators built specifically for horse owners, barn managers, and equine professionals. Estimate weight without a scale, plan feed rations, figure pasture requirements, and assess body condition.
Every tool runs in your browser with no data leaving your device. Share results via URL — text them to your vet or barn manager.
Equine weight estimation: the Carroll-Huntington formula is the industry standard: weight (lbs) = (heartgirth in inches² × body length in inches) / 330. Heartgirth is measured around the barrel just behind the elbows after a normal exhale; body length is from point of shoulder to point of buttock in a straight line. Accuracy is ±5–10% for horses of average build. Weight tapes measure heartgirth only and use breed-averaged tables — faster but less accurate (±15–20%).
Daily feed requirements: horses require 1.5–3% of body weight in dry matter forage per day. A 1,200 lb horse needs 18–36 lbs of hay dry matter (DM) daily. Typical grass hay is 90–93% DM; one flake weighs 4–8 lbs depending on hay type and density. Feeding hay at 2% BW is standard maintenance; horses in hard work, lactating mares, and growing foals need 2.5–3%+ of body weight in DM and often additional concentrate calories.
Varroa mite monitoring (bees) vs equine health monitoring share a measurement discipline: regular, standardized checks allow early detection. For horses, monthly body condition scoring (Henneke 1–9 scale) and weight monitoring catch health problems before they become crises. BCS 5 is optimal for most horses; BCS ≥7 significantly increases laminitis risk in predisposed breeds.