Horse Weight Calculator
Estimate horse or pony weight from heart girth and body length.
Enter your values
ⓘ Live results
Results
- Estimated weight
- 461 kg
- In pounds
- 1,016 lb
- Daily forage and feed
- 9.2 kg dry matter
- Minimum forage (1.5%)
- 6.9 kg
- Wormer dose basis
- 461 kg — round up to the nearest marked weight
- Rider weight guide (20%)
- 92 kg including tack
Working
- 1185^2 x 160 / 11,877 = 461 kg
Quick answer
Horse weight is estimated from heart girth squared times body length divided by a breed constant, a method within about 5% of a weighbridge.
kg = girth cm^2 x length cm / 11877
How to use the Horse Weight Calculator
- 1Measure heart girth with a tape right behind the withers and elbows, at the end of an exhale.
- 2Measure body length from the point of the shoulder to the point of the buttock.
- 3Pick the type so the right constant is used, then use the weight for feed and wormer dosing.
Worked example
Using the values the calculator loads with:
Inputs
- Heart girth185 cm
- TypeAdult horse
- Body length (point of shoulder to point of buttock)160 cm
- Daily feed as % of bodyweight2 %
Results
- Estimated weight461 kg
- In pounds1,016 lb
- Daily forage and feed9.2 kg dry matter
- Minimum forage (1.5%)6.9 kg
- Wormer dose basis461 kg — round up to the nearest marked weight
- Rider weight guide (20%)92 kg including tack
- 185^2 x 160 / 11,877 = 461 kg
Frequently asked questions
How accurate is a tape estimate?
Within about 5% of a weighbridge for typical adult horses. Very fit, very fat or unusually shaped horses drift further from the formula.
Should I use this for medication dosing?
For wormers, yes, rounding up. For prescription medicines always confirm with your vet, who may want a weighbridge figure.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.