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Bos taurus / Bos indicus • 6+ Tools

Cattle Calculators & Tools

Simple tools for cattle and calves. Estimate weight using a heart girth measuring tape, calculate average daily gain (ADG), and track 283-day calving due dates.

All Cattle Calculators (4)

Select a verified tool to calculate nutritional requirements, body mass estimates, growth curves, or reproductive timelines.

weight-growthv2.0

Cattle Weight Calculator (Shaeffer's Equation)

Calculates beef and dairy cattle body weight in pounds or kilograms from heart girth and body length measurements, with carcass yield estimates.

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weight-growthv1.0

Calf & Cattle Average Daily Gain (ADG) Calculator

Computes rate of gain over a defined feeding period in pounds or kilograms per day.

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pregnancyv1.0

Cattle Pregnancy & Calving Due Date Calculator

Computes estimated calving date, dry-off date, and key pregnancy milestones for beef and dairy cows.

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farm-managementv1.0.0

Cattle Stocking Rate & Grazing Capacity (AUM) Calculator

Calculate pasture carrying capacity and stocking rate in Animal Unit Months (AUM) based on acreage, forage production, and herd body weight.

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Scientific & Biological Overview

Cows and calves eat roughly 2% to 2.5% of their body weight in dry forage and pasture each day. Measuring heart girth around the chest gives you an accurate weight estimate for dosing dewormers and planning winter feed.

Frequently Asked Questions

How do you estimate a cow’s weight with a tape measure?
Wrap a soft measuring tape snugly around the chest right behind the front legs (heart girth) and measure body length from shoulder point to pin bone, then use the Shaeffer formula: (Heart Girth² × Length) ÷ 300.
How long is a cow pregnant?
Cattle pregnancy averages 283 days (about 9.5 months), with healthy delivery windows typically ranging between 279 and 287 days.
What is a good Average Daily Gain (ADG) for beef cattle on pasture?
Growing calves and stockers on lush, managed pasture typically gain between 1.5 and 2.5 pounds per day depending on forage quality and mineral supplementation.