Free calculator · no scale needed

How much does your animal weigh?

Measure the heart girth and body length with a tape, or a string and a ruler, and we give you the weight with its margin of error.

With sample numbers: replace them with yours.

Measure in
Just behind the front legs.
From the point of the shoulder to the pin bone.

How it is calculated

It is Schaeffer’s formula, the same one the app uses: girth² × length ÷ 300 in inches and pounds, which is ÷ 10,838 in centimeters and kilograms, for cattle and buffalo (÷ 14,450 for pigs). The margin is about 5 % for cattle, 7 % for buffalo and 8 % for pigs.

Careful with doses: weight decides the dose of many drugs. That is why we give a range, not an exact number.

Questions

How accurate is the tape?

For cattle it is off by about 5 %: on a 1,000 lb cow, around 50 lb either way. To sell by weight, use a scale.

Does it work for sheep, goats or horses?

No: the formula is validated for cattle, buffalo and pigs. For other species we do not give a number we cannot stand behind.

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