Estimate your horse's weight with a measuring tape. Enter the heart girth and body length in inches or centimeters, choose adult horse, pony, yearling or weanling, and get the weight in kilograms and pounds plus a daily forage guide.
Last updated:
Horse type
Around the barrel just behind the elbows and withers, after the horse breathes out.
Point of shoulder to point of buttock, in a straight line.
Enter your values to see the result.
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How to use the Horse Weight Calculator
Stand the horse square on level ground.
Measure the heart girth around the barrel just behind the elbow and over the withers, as the horse breathes out.
Measure the body length from the point of the shoulder to the point of the buttock.
Choose the horse type and units, then press Calculate weight.
Repeat monthly with the same method to track weight changes.
Use the same tape and the same spots every time. A change of one inch of girth on an average horse is roughly 25–30 lb.
Frequently asked questions
How do I calculate my horse's weight with a tape?
Measure heart girth and body length in inches and use weight (lb) = heart girth² × body length ÷ 330. A horse with a 72 inch girth and 66 inch length weighs about 72 × 72 × 66 ÷ 330 = 1,037 lb, or about 470 kg.
What is the formula in centimeters?
Weight (kg) = heart girth² (cm) × body length (cm) ÷ about 11,900. This is the same 330 formula converted to metric units. The calculator converts automatically when you choose centimeters.
How accurate is a weight tape?
Girth and length formulas are usually within about 10 percent of scale weight for average horses, and are more accurate than a girth-only weight tape. Very fit, pregnant, very fat or unusually built horses can be further off.
What formula is used for ponies and foals?
Extension guidelines use the same girth² × length formula with a different divisor: 299 for ponies, 301 for yearlings and 280 for weanlings, instead of 330 for adult horses.
Where exactly do I measure the heart girth?
Run the tape around the barrel just behind the elbows and about 10 cm behind the highest point of the withers. Keep it snug but not tight and read it when the horse has just breathed out.
How much hay does a horse need per day?
Most horses need forage equal to about 1.5 to 2.5 percent of their body weight per day, around 2 percent for maintenance. A 500 kg horse needs roughly 10 kg of hay or equivalent pasture each day. Ask your vet or nutritionist for special cases.
Are all the tools on FreeToolCabin tested for quality and accuracy?
Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.