Cattle Weight Calculator (Tape Method)
Estimate a bovine's live weight from heart girth and body length with the Schaeffer formula — no scale needed.
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Weighing Cattle with a Tape
The Schaeffer formula estimates live weight from two tape measurements: weight (kg) = girth² × length ÷ 10,838 (girth and length in cm). Heart girth wraps just behind the front legs and shoulder blades; body length runs from the point of the shoulder to the pin bone under the tail. A 180 cm girth with 160 cm length estimates ≈ 478 kg.
Accuracy is ±5-10% on standing, calm animals with the tape snug but not compressing. Gut fill alone swings real weight several percent through the day — measure mornings before feeding for consistency. For medicine dosing and sale negotiations the estimate is workable; for official trade a scale rules.
Frequently Asked Questions
Does the formula work for calves and sheep?
It is calibrated for grown cattle. Calves run lighter than predicted; sheep and goats need their own formulas. For those, breed-specific tapes or a scale serve better.
Why does my result differ from the market scale?
Gut fill (up to 15-20 kg), pregnancy, breed frame differences and tape tension all shift it. Treat the number as a band of ±5-10%, not a point.
How do I measure girth correctly?
Animal standing square, head neutral. Pass the tape right behind the front legs, over the shoulder hump low point, snug against the hair without denting flesh. Take two readings and average.
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Cattle Weight Calculator (Tape Method)