Kitten Calorie Calculator and Feeding Chart
Work out how many calories a growing kitten needs each day from current body weight and age. Growth uses age-based factors rather than the flat adult maintenance multiplier, so the daily target changes every few weeks as the kitten matures.
Calculate daily calories for a kitten
Resting energy (RER)
118 kcal / day
Growth energy target
294 kcal / day
Growth is still fast but slowing. Three to four meals a day, kitten formula only.
Kittens gain weight quickly, so reweigh every two weeks and recalculate. Orphan kittens, pregnant or nursing queens and patients on therapeutic diets need a veterinary feeding plan.
Turn calories into a portion
Calories are only the middle step — what you actually feed is grams. Take the energy figures from the bag or tin label and get the daily portion.
Usually printed as “metabolisable energy” on the label.
Only some labels give this. Grams are always more accurate than cups.
Daily portion
74 g / day
Your label says 4000 kcal per kg, so feed about 74 g per day to reach 294 kcal.
In cups
Add the kcal per cup from the label to see a cup measure. Cups vary a lot between foods, so weigh the food when you can.
Free beta tool: full growth planner in the dashboard
This public calculator is free while Vet.Portions is in beta. A free user account unlocks the growth planner with week-by-week feeding tables, the verified product catalogue, printable client handouts and clinical record summaries for your clinic.
How the kitten calorie calculation works
Growth energy starts from the same resting energy requirement used for adult cats, based on current body weight:
For a growing kitten that value is multiplied by an age-based growth factor rather than a fixed adult factor:
Kitten feeding chart by age
Typical calorie targets for a domestic shorthair kitten on an average growth curve. Use the calculator above with the kitten’s actual weight whenever it differs from the table.
| Age | Typical weight | Factor | Approx. kcal / day |
|---|---|---|---|
| 8 weeks | 0.9 kg | RER × 3.0 | 194 kcal |
| 12 weeks | 1.4 kg | RER × 3.0 | 270 kcal |
| 16 weeks | 2.0 kg | RER × 2.5 | 294 kcal |
| 20 weeks | 2.4 kg | RER × 2.5 | 337 kcal |
| 6 months | 2.8 kg | RER × 2.0 | 303 kcal |
| 9 months | 3.5 kg | RER × 1.6 | 287 kcal |
| 12 months | 4.0 kg | RER × 1.4 | 277 kcal |
Why the factor drops as the kitten grows
A young kitten builds tissue at a very high rate, so each kilogram of body weight needs far more energy than the same kilogram in an adult cat. As the growth curve flattens toward maturity, that extra building cost falls away. Total daily calories may still rise because the kitten is heavier, but the multiplier applied to RER steadily drops from about 3.0 to adult maintenance around 1.2 to 1.4. Neutering lowers energy needs further, which is why kittens neutered at four to six months so often gain excess weight on an unchanged ration.
From calories to grams of kitten food
Divide the daily calorie target by the food’s energy density to get the daily ration, then split it across three to four meals a day for kittens under six months:
Kitten diets are more energy dense than adult maintenance food, so the same calorie target means a smaller bowl. Vet.Portions holds verified calorie content for thousands of regional products so your team never has to read it off the bag.
Built for veterinary clinics
The full Vet.Portions dashboard turns this calculation into a kitten growth plan with product-specific gram amounts, meal splits, printable client handouts and clinical record summaries.
Frequently asked questions
- How many calories does a kitten need per day?
- Calculate RER = 70 × (current weight in kg)0.75, then multiply by the age-based growth factor: about 3.0 under four months, 2.5 from four to six months, 2.0 from six to nine months and 1.4 to 1.6 as the kitten approaches adult weight.
- How much should I feed a kitten by age?
- Use the feeding chart above as a starting point, then divide the calorie target by the kcal per gram printed on the kitten food to get the daily ration. Split it across three to four meals until six months of age.
- When should a kitten move onto adult cat food?
- Most kittens switch between ten and twelve months. Large breeds such as Maine Coons keep growing to 18 to 24 months and usually stay on a growth diet for longer. Confirm the transition with the attending veterinarian.
- Does neutering change how much a kitten should eat?
- Yes. Energy needs fall noticeably after neutering, so drop to the lower growth factor and reweigh every two to four weeks to catch early weight gain.