Free tool from TrotleyHorse weight calculator
Measure the heart girth and the body length with a soft tape. You get the estimated weight in pounds and kilograms, using the formulas in the Merck Veterinary Manual.
- Heart girth. All the way round the body, just behind the shoulder and over the base of the withers, tape snug and level.
- Body length. From the point of the shoulder to the point of the rump, with the horse standing square.
Estimated weight
1,108 lb
503 kg
- Formula used
- girth² × length ÷ 330
- Maximum daily dry matter (2.5–3%)
- 28–33 lb
This formula reads slightly low, and tapes read lower still. Measure the same way each time and follow the trend.
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Horse breeds
- American Paint HorseA Paint Horse stands 14.2 to 15.2 hands and weighs about what a Quarter Horse does, 1,000 to 1,300 pounds.
- American Quarter HorseMost Quarter Horses weigh 1,000 to 1,300 pounds and stand 14.2 to 15.2 hands.
- American SaddlebredAn American Saddlebred weighs 1,000 to 1,200 pounds and stands about 15 to 16.3 hands.
- AppaloosaMost Appaloosas weigh 950 to 1,250 pounds and stand 14 to 16 hands.
- ArabianAn Arabian usually weighs 800 to 1,000 pounds and stands 14.2 to 15.2 hands.
- ClydesdaleA Clydesdale weighs 1,600 to 1,800 pounds and stands 16.2 to 18 hands, and some stallions and geldings reach 2,200 pounds.
- Missouri Fox TrotterA Missouri Fox Trotter weighs 900 to 1,200 pounds and stands 14 to 16 hands.
- MorganA Morgan weighs 900 to 1,100 pounds and stands 14.2 to 15.2 hands.
- PercheronA Percheron averages about 1,900 pounds and stands 16.2 to 17.3 hands, with some up to 2,600 pounds.
- StandardbredMost Standardbreds stand about 15.2 hands and weigh 800 to 1,000 pounds, though one extension source runs to 1,300.
- Tennessee Walking HorseA Tennessee Walking Horse weighs 900 to 1,200 pounds and stands 14.3 to 17 hands.
- ThoroughbredA typical Thoroughbred weighs about 1,000 pounds and stands about 16 hands.
How it works
Heart girth is measured around the body just behind the shoulder, at the base of the withers. Body length is measured from the point of the shoulder to the point of the rump, with the horse standing square.
For an adult horse (over 2 years), weight in pounds = heart girth × heart girth × body length ÷ 330, in inches. For a yearling the divisor is 301 and for a weanling 280. In centimetres, the adult formula is girth² × length ÷ 11,880 for kilograms.
The Merck Veterinary Manual notes that the formula is closer to real weight than a weight tape but tends to slightly underestimate. Measure the same way each time and the trend is reliable even when the number is a little off.
Adult: lb = girth² × length ÷ 330 (inches). Yearling: ÷ 301. Weanling: ÷ 280.
Good to know
- A scale is the only exact method. Use the estimate to follow changes and as a starting point.
- Weight tapes do not suit miniature horses, donkeys or draft horses; treat any girth-based estimate for them with caution.
- Ask your veterinarian before dosing a medicine from an estimated weight.
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<p style="margin:4px 0 0;font-size:14px"><a href="https://lucernel.com/tools/horse-weight-calculator">Horse weight calculator by Trotley</a></p>Frequently asked questions
How accurate is a horse weight tape?
Tapes are the least accurate tool and tend to underestimate. The girth-and-length formula is closer, but still slightly low; a scale is the only exact method.
Where do I measure heart girth?
All the way around the body just behind the shoulder, over the base of the withers, with the tape snug and level.
How much does a horse eat per day?
The Merck Veterinary Manual puts the maximum daily intake at about 2.5 to 3% of body weight in dry matter. Your veterinarian or nutritionist sets the actual ration.
Sources
Checked on September 26, 2026.
For the rest, there is Trotley
Trotley keeps every horse’s record.
Track weight next to vaccination, dental, farrier and feed records for each horse, with reminders and reports for your vet.
- Weight history charts per horse
- Vaccination, dental, farrier and medication records
- PDF reports for the vet or a new owner
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