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FurCalc

Cattle Weight Calculator — Heart Girth Estimation Method

What does your steer, heifer or calf weigh without a livestock scale? This calculator estimates body weight from heart girth × body length with separate divisors for beef adults, dairy cows, feeders, weanlings and calves — matching the extension-service standard documented by USDA livestock resources. Accuracy is ±3-5%, enough for accurate dewormer dosing, market weight estimates, and stocker-feeder transitions.

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Measurements

Around the chest, just behind the front legs.

Point of shoulder to point of pin bone (rear).

Estimated weight
1,037lb · 470 kg
±5–10 % accuracy with careful measurement.
Use for feed ration calculation, veterinary dosing, and market weight estimation. Scale is still preferred for calving-adjusted weights.

Cattle weight formulas and divisors by class

ClassTypical weightHG² × BL divisorUse case
Beef adult (cow/bull)1,000-1,800 lb÷ 300Sale weight, dewormer dose
Dairy cow1,200-1,500 lb÷ 300Lactation feed calculation
Feeder steer500-900 lb÷ 280Stocker-feeder transition
Weanling400-600 lb÷ 280Sale & ADG tracking
Calf (under 6 mo)100-400 lb÷ 260Tracking growth, dewormer

HG = heart girth (in), BL = body length (point of shoulder to pin bone, in). Result in lb. Accuracy ±3-5% vs scale.

Cattle weighing terminology

Heart girth
Circumference around the chest just behind the front legs; main predictor in body-weight estimation.
Body length
Point of shoulder to pin bone (tail head); second key input in the heart-girth formula.
ADG (average daily gain)
Pounds of weight gained per day — main performance metric in stocker/feeder operations.
Feeder weight
Sale weight at which a calf enters a feedlot, typically 600-800 lb.
Hot carcass weight (HCW)
Carcass weight immediately after slaughter; live weight × dressing percentage (~60%).

Frequently Asked Questions

How do I weigh a cow without a scale?

Use the heart-girth formula: weight (lb) = (heart girth² × body length) / 300 for beef cattle. Measure heart girth around the chest just behind front legs, and body length from point of shoulder to point of pin bone.

How much does a cow weigh?

Beef cattle: Angus 1,200–1,400 lb (steers), Hereford 1,200–1,400, Simmental 1,500–1,800. Dairy: Holstein 1,400–1,500, Jersey 900–1,100. Calves: 60–100 lb at birth.

Are cattle weight tapes accurate?

Weight tapes are ±50–100 lb for adult cattle — sufficient for feed rations but not for precision drug dosing. The heart-girth × body-length formula is slightly more accurate.

How much should a feeder calf weigh?

At weaning (6–8 months): 400–600 lb. Feeder weight (ready for feedlot): 700–900 lb. Finished weight: 1,200–1,400 lb after 3–4 months on feed.

Sources & References

  1. [1]
    Cattle Weight Estimation — Extension — Oregon State Extension
  2. [2]
    Beef Cattle Weight Formula — University of Nebraska
  3. [3]

Common mistakes to avoid

  • Measuring over a full rumen — take heart-girth early morning before grazing for consistency.
  • Using dairy formulas on beef cattle — heart girth calculations differ by type. Beef multiplier is different than Holstein.
  • Skipping the tape measurement in favor of eyeballing — experienced ranchers still miss by 150+ lb when guessing.

When to call the vet immediately

  • Rapid weight loss >5% in 2 weeks — parasites, BVD, Johne's disease are common causes.
  • Failure to gain on good pasture — indicates GI parasites or mineral deficiency; check fecal egg count and selenium levels.

Pro tips

  • Re-weigh monthly during growing phase, quarterly at maintenance.
  • For show cattle, use a livestock walk-over scale for ±5 lb accuracy if available.