🐴 Horse Weight Calculator
Measure heart girth and body length to calculate an approximate body weight for horses and ponies.
Measure girth just behind the front legs; length from point of shoulder to point of buttock.
Tip
Use a soft measuring tape. For large horses, use a weight tape and multiply the reading alongside this calculation for accuracy.
How to Use This Calculator
Measure girth and length
Wrap the tape snugly around the heart girth and measure body length on level ground.
Select units
Input inches or centimeters—the calculator handles conversions.
Use the result
Apply the estimated weight for feed calculations, medication dosing, or verifying trailer capacity.
Formula
Weight (lb) = (Girth2 × Length) ÷ 300
Weight (kg) = Weight (lb) ÷ 2.20462
Formula assumes a typical mature horse. Ponies, draft breeds, and foals may require breed-specific multipliers—use as a guideline only.
Full Description
Estimating weight without a livestock scale helps manage diet, medications, and body condition. Pair weight estimates with body condition scoring for a complete health picture.
Repeat measurements monthly and record results to monitor weight gain or loss trends.
Frequently Asked Questions
How accurate is the formula?
Expect ±5–10% variance depending on body type. Use actual scales when precision is required.
Can I use weight tapes instead?
Yes. Weight tapes provide quick estimates. This calculator offers a second reference point.
Do foals need a different formula?
Young horses have different proportions. Consult your veterinarian for foal-specific calculations.
How often should I weigh my horse?
Monthly checks help maintain weight. Increase frequency during diet changes or medical treatment.