Pet Feeding Calculator
Estimate daily food portions using your food’s calorie information, and see how supplements fit into your pet’s diet.
1. About your pet
2. What are they eating?
Formula: resting energy requirement RER = 70 x body weight (kg)^0.75, multiplied by a life-stage factor (the values used by the Ohio State veterinary college and WSAVA). This is a starting point, not a prescription - feel the ribs and look at the body shape every fortnight, and adjust 10% either way. Food calories come from each brand's official kcal/kg; go by the feeding table and the actual batch of your own food.
1. Which pet
2. Choose the supplements to combine (up to 3)
| Product | Per day | One jar lasts | Estimated daily cost |
|---|
Zesty Paws’ guidance: different Zesty Paws supplements can usually be given together, but it is best to ask your vet first. What we actually do: add one at a time, and wait at least a week without any problems before introducing a second product; keep to 2 or 3 at once; and do not stack the same function (the 8-in-1 already contains glucosamine and probiotics).The brand does not publish a per-chew calorie figure; at roughly 3.5 g a chew we estimate about 12 kcal, which is enough to check you are not over the 10% daily treat ceiling.
Not sure which to pick? Find the right supplement in 30 seconds →Why calculate at all, instead of just following the pack?
The feeding table on the pack is an average across a weight band: it does not separate neutered pets from pets that have not been neutered, or a dog that sleeps all day from one that runs all day. For the same 10 kg dog, being neutered cuts the daily calorie need by roughly 11%; an active working dog can need double. A figure from RER x factor, combined with the official calories of your own food, is a starting estimate tailored to your pet. After that, adjust every fortnight by body condition.
Official calories for common foods (kcal/kg, checked September 2026)
| Food | kcal/kg | Daily amount for a 10 kg neutered adult dog |
|---|
Figures come from each brand's official product pages or feeding data; different formulas from the same brand can differ by several hundred kcal, so if your food is not listed, use Custom and enter the kcal/kg from the pack.
How many supplements can be given at once?
The Zesty Paws official FAQ says different products can usually be given together, but it is best to ask your vet first. We suggest three practical rules: 1) add one at a time and watch for 7 days; 2) keep to 2 or 3 at once; 3) do not stack the same function - the 8-in-1 multivitamin already contains glucosamine, probiotics and Omega, so adding the joint chew or the probiotic chew on top doubles up, unless your vet tells you to. The Senior 11-in-1 works the same way. Salmon oil and the coat chew, or the probiotic chew and the probiotic powder, are each an either/or.
Frequently asked questions
Why do treats and supplements count towards the 10%?
The convention in veterinary nutrition is that treats (including supplement chews) should stay under 10% of total daily calories, or the nutrient balance of the main meals gets diluted. A 10 kg neutered adult dog needs about 640 kcal a day, so the treat ceiling is around 64 kcal; at about 12 kcal a chew, 2 to 3 sits comfortably inside it.
What about wet or fresh food?
Use the food’s energy value in kcal/kg. If the label gives kcal per tin, divide that value by the tin’s net weight in grams and multiply by 1,000 before entering it.
What about puppies and kittens?
Puppies under 4 months use 3 x RER, and 4 months to adulthood 2 x; kittens use 2.5 x. During puppyhood we suggest splitting it into 3 to 4 meals.
What if the result is far off what the pack says?
That is normal. The pack gives the middle of a range; this works from your own pet's situation. Pick a starting point between the two, then adjust by 10% after a fortnight based on body condition (ribs you can feel but not see, a clear waistline).
The above is a reference built from published veterinary nutrition formulas and official brand data - not a clinical assessment or a prescription. If your pet is unwell, pregnant, nursing, or on a prescription food or medication, ask your vet first. Follow the feeding instructions on the product label.
