Free Cattle Weight Calculator
Estimate your cattle’s weight using Agarwal’s Formula - just measure heart girth and body length
Skip the Tape Measure Entirely
While tape measurements work, CattleWeight AI uses guided 3D capture on a compatible iPhone Pro to estimate weight with ±3% accuracy. No measuring tape. No moving animals to handling systems. No extra sensor or accessory. Just walk up to any animal in the field and scan.
1. Heart Girth (Circumference)
Measure around the chest, just behind the front legs and over the top of the shoulders. The tape should be snug but not tight. Measure in centimeters.
2. Body Length
Measure from the point of the shoulder (where neck meets shoulder) to the pin bone (rear point of hip). Keep the tape along the side of the animal. Measure in centimeters.
Measure around the chest behind front legs
Measure from shoulder point to pin bone
About Cattle Weight Estimation
Understanding the methods and accuracy of weight calculations
Health Monitoring
Check weak animals weekly to track recovery and decide when treatment is needed - without moving them to scales
Sales Timing
Know when calves hit target weight (e.g., 200 kg) and sell at optimal market conditions - check them right in the pasture
Breeding Selection
Compare offspring weights at specific ages (3 months, 6 months) to identify top performers for your breeding program
Culling Decisions
Assess market value of cull cows and bulls to determine the best moment to sell based on actual weight data
Professional Scales: ±1% accuracy (gold standard)
Guided 3D Capture (CattleWeight AI): ±3% accuracy
No tape needed; guided 3D capture
Tape Measurements: ±5-8% accuracy (this calculator)
Visual Estimation: ±15-25% accuracy
- Measure when the animal is calm and standing square
- Use a flexible measuring tape designed for livestock
- Take measurements at the same time of day
- Measure multiple times and average the results
- Keep the tape level and snug but not tight
- Account for pregnancy, bloating, or recent feeding
Ready for the Future of Cattle Management?
Join ranchers helping shape guided 3D phone capture for faster, more practical cattle weighing
Beta rollout to partners Oct 2026 • Early access available now