Horse Weight Calculator
Estimate your horse's weight using heart girth and body length measurements.
No livestock scale needed.
Estimated Horse Weight
Estimating a horse’s weight without a scale is essential for proper feeding, medication dosing, and health monitoring. The heart girth method is the most widely used and reasonably accurate technique.
The formula (adult horses):
Weight (lbs) = (Heart Girth² × Body Length) / 330
The formula (ponies):
Weight (lbs) = (Heart Girth² × Body Length) / 299
How to measure:
- Heart girth: Measure around the horse’s barrel, just behind the elbow and withers. Use a flexible tape measure pulled snug but not tight. Measure in inches.
- Body length: Measure from the point of the shoulder (where the neck meets the chest) to the point of the buttock (tuber ischii). Measure in inches.
Accuracy: This method is typically accurate within 5-10% for most horses. Very thin or very obese horses may fall outside this range.
Average weights by type:
- Light pony (under 12 hands): 400-600 lbs (180-270 kg)
- Welsh/large pony (12-14 hands): 600-900 lbs (270-410 kg)
- Light riding horse (14-16 hands): 900-1,100 lbs (410-500 kg)
- Warmblood (16-17 hands): 1,100-1,400 lbs (500-635 kg)
- Draft horse (17+ hands): 1,500-2,200 lbs (680-1,000 kg)
Why weight matters:
- Dewormer dosing is based on weight. Underdosing is ineffective; overdosing can be harmful.
- Feed amounts are typically 1.5-2.5% of body weight per day in forage.
- Weight changes over time indicate health status. A loss of more than 5% warrants veterinary attention.
- Rider weight should ideally not exceed 20% of the horse’s weight.