Enter your figures
Enter the values below. Use the units shown for each field.
Formula / methodChange = ending weight − starting weight; percentage change = change ÷ starting weight × 100.
Your result
Calculated from your inputs.
Weight gain or loss
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Percent change
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Direction
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Reference note: Weight changes can have many causes. This calculator describes the change but does not determine its cause.
How to use this calculator
What to enter
Enter or select the following as requested: Starting weight; Ending weight. Follow the units, valid ranges, examples, and options displayed beside each field.
What the result means
The animal-care result estimates the quantity, rate, schedule, or cost based on the animal details and values entered. Check species, age, body weight, units, activity level, and the assumptions shown by the tool.
When to use it
Use this for general planning and educational reference. For diet, medication, symptoms, or animal health decisions, confirm the result with a veterinarian and follow product-specific instructions.