Pet Food Portion Calculator
Take the guesswork out of feeding time. Enter your dog or cat's weight, life stage, and activity level to get the right daily calories and food amount.
Check your food bag for its calorie density (kcal per cup) — using the exact number gives a far more accurate portion than a generic chart.
How to Use the Pet Food Portion Calculator
A few details about your pet and their food is all you need.
Enter your pet's details
Choose dog or cat, add their current weight, and select the life stage and activity level that best fits them.
Add your food's calorie density
Check the feeding guide on your food bag for calories per cup — this is what makes the estimate specific to your brand and formula.
Get daily & per-meal amounts
See total daily calories, cups per day, and how much to serve at each meal.
How This Calculator Works
Based on veterinary energy-requirement formulas.
🔥 Resting Energy Requirement (RER)
RER estimates the calories your pet burns at rest, calculated from body weight using the formula 70 × (weight in kg)0.75. It's the scientific starting point vets use before adjusting for lifestyle.
🐕 Adjusted for life stage & activity
RER is then multiplied by a factor based on your pet's life stage and activity — growing puppies and kittens need roughly 2-2.5× RER, while a low-activity adult may need closer to 1.4×.
Feeding Tips
Small habits that support a healthy weight and routine.
✅ Feeding well
- Use a measuring cup or kitchen scale, not a scoop by eye
- Split food into consistent meal times rather than free-feeding
- Re-check portions every few months as weight or activity changes
⚠️ Common feeding mistakes
- Following the bag's generic chart instead of your pet's actual needs
- Forgetting to count treats toward daily calories
- Not adjusting portions after spaying/neutering, which often lowers needs
Frequently Asked Questions
Common questions about pet food portions.
Start from your pet's resting energy needs based on weight, then adjust for life stage and activity level to get daily calorie needs. Divide that by the calorie density of your specific food to get the daily amount.
Calorie density varies significantly between brands and formulas, sometimes by 30% or more. Using your exact food's calorie count (usually on the bag or website) gives a far more accurate portion than a generic feeding chart.
Yes, significantly more relative to their body weight, since growth requires substantially more energy. Growing puppies and kittens typically need roughly double the calories of an adult pet at maintenance.
Puppies and kittens generally do best with 3-4 smaller meals a day, while most adult dogs and cats do well on 2 meals a day, split evenly.