A beef calf weighs 60–100 lb at birth and reaches 500–700 lb by weaning at 5–7 months. Daily gain averages 2.0–2.5 lb/day on grass, or up to 3.5 lb/day on creep feed. Birth weight varies significantly by breed — Charolais and Simmental calves are born heavier (90–110 lb) while Jersey dairy calves are born lighter (45–65 lb). Sex also matters: bull calves run 5–10 lb heavier than heifer calves at birth and maintain that advantage through weaning.
| Age | Beef Steer (lb) | Beef Heifer (lb) | Dairy Calf (lb) |
|---|---|---|---|
| Birth | 70–100 | 60–90 | 45–75 |
| 1 month | 130–160 | 120–145 | 85–110 |
| 2 months | 190–230 | 175–210 | 130–160 |
| 3 months | 250–310 | 230–280 | 170–210 |
| 4 months | 320–390 | 290–350 | 210–260 |
| 5 months | 390–470 | 350–420 | 250–310 |
| 6 months (weaning) | 460–560 | 420–510 | 290–360 |
| 12 months (yearling) | 750–950 | 650–800 | 500–650 |
Beef figures based on Angus/Angus-cross at moderate BCS on grass with creep supplementation. Dairy figures based on Holstein. Actual weights vary by breed, nutrition, and management.
Table of Contents
How Much Does a Calf Weigh at Birth?
A healthy beef calf weighs 60–100 lb at birth. Bull calves average 5–10 lb heavier than heifer calves of the same breed. Birth weight is determined primarily by genetics, dam nutrition during late gestation, and calf sex.
As confirmed by the American Angus Association’s adjusted weight data, the average adjusted birth weight for registered Angus calves is approximately 83 lb for bulls and 78 lb for heifers. Larger-framed breeds like Charolais and Simmental regularly produce calves in the 90–110 lb range, while smaller dairy breeds like Jersey produce calves at 45–65 lb.
Birth weight matters beyond the first day. Calves born above 110 lb carry a higher risk of dystocia — difficult delivery — particularly in first-calf heifers. Calves born below 60 lb are at higher risk of hypothermia and failure to thrive. The ideal target range for most beef operations is 70–95 lb.
Average Calf Weight at 1, 2, and 3 Months
Beef calves gain 1.8–2.5 lb per day in the first three months on a cow-calf operation. A well-managed 90-day-old Angus steer calf should weigh 250–300 lb. Factors that most affect early growth: dam milk production, pasture quality, and whether creep feed is offered.
As confirmed by OSU Extension beef cattle specialist Mark Z. Johnson via Drovers, average daily gain from birth to weaning on well-managed grass-based operations runs 2.0–2.5 lb/day for steers and 1.8–2.2 lb/day for heifers. On creep feed supplementation, top-end Angus bulls can achieve 3.83–4.1 lb/day as confirmed by OSU Purebred Beef Center data reported by Western Livestock Journal.
Dairy calves grow more slowly in this period. A Holstein calf at 90 days typically weighs 170–210 lb — significantly less than a beef calf of the same age — because dairy genetics prioritize milk production over rapid growth.
Average Calf Weight at 4, 5, and 6 Months (Weaning)
Most US cow-calf operations wean at 150–210 days (5–7 months). As confirmed by USDA National Agricultural Statistics Service, the national average weaning weight for beef calves is 540–580 lb for steers and 490–530 lb for heifers, though this varies significantly by region, breed, and management system.
A calf significantly below these benchmarks at weaning signals one of three problems: inadequate dam milk production, poor pasture quality or carrying capacity, or a subclinical health issue reducing feed conversion. A calf above these benchmarks — particularly one approaching 650+ lb at weaning — indicates superior genetics or intensive creep feeding.
Weaning weight is the single most economically important weight benchmark in a cow-calf operation. It directly determines the value of calves sold at weaning and sets the trajectory for subsequent feedlot performance.
Average Calf Weight at 12 Months (Yearling)
A yearling beef steer at 12 months should weigh 750–950 lb on a grass-based program. Yearling weight is the second most important benchmark — it determines whether replacement heifers are on track to reach breeding weight (60–65% of mature cow weight) at 14–15 months.
For an Angus heifer with a mature cow weight of 1,200 lb, the breeding weight target is 720–780 lb at 14–15 months. A heifer that fails to reach this threshold before her first breeding season will have reduced conception rates and compromised lifetime productivity.
For bull-specific weight benchmarks beyond yearling age and into the breeding years, see our guide to average bull weight by breed.
Calf Weight by Breed — How Much Does Each Breed Differ?
Breed is the single biggest variable in calf weight after age. Here’s how the major US beef and dairy breeds compare at birth and weaning:
| Breed | Birth Weight (lb) | Weaning Weight — Steer (lb) |
|---|---|---|
| Angus | 75–90 | 520–600 |
| Hereford | 75–90 | 500–580 |
| Red Angus | 75–88 | 510–590 |
| Charolais | 90–110 | 600–700 |
| Simmental | 88–105 | 580–680 |
| Brahman | 65–85 | 480–560 |
| Holstein (dairy) | 85–105 | 400–500 |
| Jersey (dairy) | 45–65 | 290–380 |
Charolais and Simmental calves are born heavier and grow faster — they are terminal sire breeds selected specifically for growth. Brahman calves are born lighter but are highly heat-tolerant, making them the dominant breed in the Gulf Coast and Southern US. Jersey calves are the lightest at both birth and weaning.
What Does It Mean If Your Calf Is Underweight?
A calf more than 15% below the expected weight for its age and breed warrants investigation. The most common causes in order of frequency: dam producing insufficient milk (check dam body condition score), internal parasites (weigh and treat the calf), inadequate pasture (assess carrying capacity and supplement), or a chronic respiratory or digestive issue reducing feed conversion.
For accurate weight assessment in the field without a scale, the heart girth formula provides a reliable estimate within ±5%. See our full guide to estimating cattle weight without a scale for the step-by-step method.
For operations selling calves at weaning, tracking weight against these benchmarks every 30 days from birth is the most practical management tool available. A simple livestock scale or weigh tape check at 30, 60, 90, and 205 days produces the data needed to identify problems before they cost money at the sale.
For a complete weight reference from weaning through market weight across all major breeds, see our cattle weight chart.
FAQs
How much does a newborn calf weigh?
A newborn beef calf typically weighs 60–100 lb, depending on breed and sex. Bull calves average 5–10 lb heavier than heifer calves. Charolais and Simmental calves are born heaviest (90–110 lb); Jersey dairy calves are born lightest (45–65 lb).
How much does a calf weigh at 6 months?
A beef steer calf at 6 months (weaning) typically weighs 460–560 lb on a grass-based operation. Heifers average 420–510 lb. USDA NASS reports the national average weaning weight at 540–580 lb for steers and 490–530 lb for heifers.
How much does a calf weigh at 3 months?
A beef steer calf at 3 months weighs approximately 250–310 lb on a cow-calf operation with moderate pasture. Heifers average 230–280 lb at the same age.
How much does a calf weigh at 12 months?
A yearling beef steer at 12 months weighs 750–950 lb on a grass program. Replacement heifers should weigh 650–800 lb at 12 months to stay on track for breeding weight at 14–15 months.
How much does a baby calf weigh?
A newborn (baby) calf weighs 60–100 lb for beef breeds and 45–75 lb for dairy breeds. The calf should gain approximately 2 lb/day from birth, reaching roughly 130–160 lb by 30 days of age.
How do I know if my calf is the right weight for its age?
Compare your calf’s weight against the age-weight table above. A calf more than 15% below expected weight warrants a health and nutrition check — assess dam milk production, parasite load, and pasture quality. For field weight estimates without a scale, use the cattle weight formula.
Conclusion
A calf’s weight at every stage is one of the most reliable indicators of whether your operation is working. Birth weight reflects dam nutrition and genetics. Weaning weight reflects pasture quality, dam milk production, and herd health. Yearling weight tells you whether replacement heifers are on track for breeding.
The benchmarks here — 60–100 lb at birth, 500–700 lb at weaning, 750–950 lb at 12 months — are starting points, not fixed targets. What matters is whether your calves are hitting expected milestones for their breed and age, and acting quickly when they fall short.
For weight benchmarks beyond weaning across all major US breeds, see our complete cattle weight chart. For field weight estimates without a scale, see our guide to estimating cattle weight without a scale.
