Pig Weight Calculator — Estimate Live Weight

Use heart girth and body length to estimate a pig’s live weight quickly and safely. Ideal for farmers, breeders, and smallholders.

Heart Girth

Measure circumference just behind front legs.

Body Length

Measure from base of ears to base of tail.

Units for measurements Inches (in) Centimetres (cm)

Output weight units Pounds (lbs) Kilograms (kg)

Calculate Weight Reset

Result:

Enter measurements and click Calculate Weight.

Formula

Standard estimation formula used by many farmers:

Weight (lbs) = (Heart Girth² × Body Length) ÷ 400

If you enter measurements in centimetres, the calculator will convert them to inches before applying the formula.

How the Pig Weight Calculator Works

A pig weight calculator uses simple body measurements to estimate the animal’s live weight without needing a scale. By entering two key values—heart girth and body length—the tool applies the standard livestock formula to calculate an accurate weight estimate. This method helps farmers save time, reduce handling stress, and make more informed decisions about feeding and management.

Measuring Heart Girth Correctly

Heart girth is the most important measurement for estimating pig weight. Wrap a measuring tape around the pig’s body just behind the front legs. Make sure the tape stays level, snug, and not too tight. Accurate girth measurement improves the reliability of the final weight result.

Measuring Body Length

Body length is measured from the midpoint of the pig’s ears to the base of its tail. Use a flexible tape measure and ensure the pig is standing straight. Proper length measurement works with girth to produce a more accurate weight calculation.

Pig Weight Formula

A commonly used formula to estimate pig weight is:

Weight (lbs) = (Heart Girth² × Body Length) / 400

This formula is widely used by farmers and provides a reliable estimate of live weight. The calculator applies this automatically once the user enters both measurements in inches.

Why Estimating Pig Weight Matters

Knowing the accurate weight of a pig is essential for multiple reasons. Farmers use this information to plan feed schedules, track growth progress, and identify health issues early. Weight estimates also help determine the ideal time for marketing or sale. By using a pig weight calculator, farmers can easily monitor development without special equipment.

Tips for Getting the Best Results

To improve accuracy, take measurements when the pig is calm and standing naturally. Use a flexible, non-stretchable tape measure and repeat each measurement two or three times. If the pig moves, simply re-measure to ensure the numbers are consistent. Cleaner results come from careful and patient measurement.