We’ve developed this easy-to-use calculator to help Vets work out the best feeding plan for their patients.
Watch our short video to see how it works before testing it yourself.

How It Works
Patient Name:
Date:
BWT (kg):
Case Vet:
1. Calculate RER (Resting Energy Requirement)
a. For dogs and cats between 2 kg and 45 kg use a linear formula - RER= (30 x BW) + 70
30 x BWT + 70 = 70.00 kcal required/day
b. Alternatively, you can use an allometric formula that can be applied to dogs and cats of all body weights (BW)
70 x (BWT ^ 0.75) = 0.00 kcal required/day
2. Choose illness factor if required and use to multiply RER
a. Ilness factor: ** input 1 (one) if not applicable
3. Product Selected: = kcal/ml
4. Calculate water addition and caloric density dilution
a. volume of food made up (mls) = + ml/water = 1.00 kcal/ml
5. Calculate the volume of food to be given (RER x Illnes factor ÷ kcal/ml)
a. x illnesss factor ÷ kcal/ml = 4.00 ml per day at full RER
6. Input the number of feeds for the day (between 4-6 feeds per day is usually sufficient)
a.
7. Divide into administration schedule
Day 1 = 1/4 RER 1 ml/day then divide by number of feeds 2 = 1ml per day at full RER
Day 2 = 1/2 RER 2 ml/day then divide by number of feeds 2 = 1ml per day at full RER
Day 3 = 3/4 RER 3 ml/day then divide by number of feeds 2 = 2ml per day at full RER
Day 4 = Total 4 ml/day then divide by number of feeds 2 = 2ml per day at full RER
Caloric content (kcal per gram)
Brand/Type Kcal per gram Brand/Type Kcal per gram
Hills a/d 1.2 kcal/ml Royal Canin Recovery 1.18 kcal
Hills i/d 1.3 kcal Royal Canin GI low fat dog 0.94 kcal
Hills k/d 1.23 kcal Royal Canin GI cat 0.95 kcal
Other: Ensure 1 kcal/ml