Veterinary RER and MER Calculator

Resting and maintenance energy for dogs and cats. Feeding math, not a drip converter.

Formula

RER (kcal/day) = 70 × BW(kg)^0.75

Linear option for 2–30 kg: RER = 30 × BW + 70
MER = RER × factor

Factors are starting points from WSAVA nutritional assessment
and AAHA nutrition guidelines. Recheck body-condition score.

References

1. NRC. Nutrient Requirements of Dogs and Cats. National Academies Press; 2006. Allometric RER.
2. WSAVA Global Nutrition Committee. Nutritional assessment guidelines. RER = 70 × BW^0.75 and MER factors.
3. AAHA. Nutrition and weight management guidelines. 2021. MER starting multipliers and BCS monitoring.

Veterinary education only. Not a prescription. Confirm doses and volumes with the attending clinician and current formularies before use.