🐾 Pets
Pet Food Calories per Cup
Convert a pet food's kcal/kg into kcal per cup or ounce, and work out a daily portion. Enter the label values, then press Convert.
About the Pet Food Calories per Cup
Pet food labels usually give metabolisable energy in kcal/kg, while feeding guides talk in cups. The bridge is the food's density: a cup of small kibble can weigh 80 g, a cup of large kibble 120 g. That is why two foods with the same kcal/kg can need very different cup amounts.
Weigh a cup of your actual food on a kitchen scale, then enter that weight. The calculator converts between kcal/kg, kcal/cup and kcal/oz, and estimates a daily portion from your pet's weight. The portion is a starting point; age, activity, neutering and body condition all change the requirement.
How the calculation works
- kcal/cup = kcal/kg × cup weight (g) ÷ 1,000.
- kcal/oz = kcal/kg × 28.3495 ÷ 1,000.
- kcal/day = portion (g) × meals × kcal/kg ÷ 1,000.
- Cups/day = kcal/day ÷ kcal/cup.
Reference values
| Food energy | 100 g | 1 cup (100 g) | 1 oz |
|---|---|---|---|
| 3,000 kcal/kg | 300 kcal | 300 kcal | 85 kcal |
| 3,500 kcal/kg | 350 kcal | 350 kcal | 99 kcal |
| 4,000 kcal/kg | 400 kcal | 400 kcal | 113 kcal |
| 4,500 kcal/kg | 450 kcal | 450 kcal | 128 kcal |
Worked example: a 20 kg dog and a 4 kg cat
A 3,500 kcal/kg food with a 100 g cup provides 350 kcal per cup. A 20 kg dog at resting energy requirement (70 × 20^0.75 ≈ 662 kcal/day) with a 1.6 activity factor needs about 1,059 kcal/day, or 3.0 cups. A 4 kg cat at 70 × 4^0.75 ≈ 198 kcal/day with a 1.2 factor needs 238 kcal/day.
Those are starting points, not prescriptions. Body condition, age, neutering and treats change the requirement. Adjust by about 10% at a time and weigh the pet regularly; a sudden change in appetite or weight is a reason to see a vet rather than to recalculate the bowl.
Frequently asked questions
Sources and standards
Pet food energy is normally stated as metabolisable energy, estimated with a modified Atwater calculation. AAFCO publishes the labelling convention, and the FDA explains how declared figures are derived, so the page treats a calorie figure as an estimate rather than a measurement.
- Association of American Feed Control Officials
- US Food and Drug Administration — How to understand the Nutrition Facts label
Related tools
A note on pet feeding
These figures are general guidance based on typical energy densities and body-weight ranges. Individual needs vary with age, activity, neutering status and health, so confirm any change of portion or diet with your veterinarian.