Enter your figures
Enter the values below. Use the units shown for each field.
Formula / methodWeekly change = (ending weight − starting weight) ÷ days × 7.
Your result
Calculated from your inputs.
Average weight change per week
—
Monthly rate
—
Total change
—
Reference note: Growth rates are descriptive only. Young animals can have highly variable growth patterns by breed and individual.
How to use this calculator
What to enter
Enter or select the following as requested: Starting weight; Ending weight; Days between measurements. Follow the units, valid ranges, examples, and options displayed beside each field.
What the result means
The result estimates the pet or animal quantity, age, growth, time, or cost from the information entered. Species, breed, age, activity, health, and product-specific requirements can change the appropriate value.
When to use it
Use this for general planning and reference. For feeding, medication, growth concerns, or animal health decisions, confirm the result with a veterinarian or qualified animal-care professional.