Enter Your Pet's Information
Small: 5-20 lbs | Medium: 20-50 lbs | Large: 50-100 lbs | Giant: 100+ lbs
Spayed/neutered pets typically need 20-30% fewer calories
Understanding the Formula
Resting Energy Requirement (RER)
RER = 70 × (body weight in kg)0.75
This is the base calories needed at rest.
Daily Energy Requirement (DER)
DER = RER × Life Stage Multiplier × Activity Multiplier
Adjusted for your pet's life stage, activity level, and whether they're spayed/neutered.
Pro Tip: Check your specific food's calorie content on the package. Calorie density varies significantly between brands (300-500 cal/cup for dry food).
Important Disclaimer
This calculator provides general guidelines based on veterinary nutrition formulas. This is not medical advice.
- Individual needs vary based on metabolism, health conditions, and specific food brands
- Always consult your veterinarian for personalized feeding recommendations
- Pets with health conditions, very young/old pets, or those needing weight changes require veterinary guidance
- Check your specific food's calorie content - it varies significantly between brands