Cat food portion calculator: how much to feed your cat
One daily number in cans, cups or grams.
To find the right cat food portion, start with your cat's daily calorie target, subtract treat calories, then divide what is left by the kcal per can or per cup printed on the label. The cat food portion calculator below does this for wet food, dry food or both, and shows the result in cans, cups and grams.
Need your food's label numbers? Look them up in the cat food calorie database: Hill's Science Diet calories, Fancy Feast calories, Purina Pro Plan calories, Tiki Cat calories, 9Lives calories.
First, work out your cat's calories per day with the cat calories per day calculator, or let the calculator above estimate it. Then look up the label numbers for your food in the cat food calorie database. BowlMath does not diagnose anything; it turns food label calories into a feeding plan you can use.
How much should I feed my cat a day?
BowlMath starts with the common RER formula used in veterinary nutrition estimates:
The multiplier matters. The AAHA nutrition and weight management guidelines list feline factors such as neutered adults, intact adults, inactive or obesity-prone pets and growth. BowlMath uses that structure as a starting estimate, then tells you to adjust with your cat's weight trend and your vet.
What do I need to know about my cat?
Food bags often use average feeding instructions. Your cat is not average. A chunky indoor adult, a lean active adult and a growing kitten should not be treated as the same animal.
- Use your cat's current weight in kg or lb.
- Choose kitten, adult or senior.
- Mark whether your cat is spayed or neutered.
- Choose body condition: thin, ideal or chunky.
- Choose activity: low, normal or high.
How do I read the calories on a cat food label?
The important number is the metabolizable energy statement. It may appear as kcal per can, kcal per pouch, kcal per tray, kcal per cup, kcal per kg or kcal per 100g. BowlMath lets you enter the unit you actually see.
| Label says | What to enter | Best use |
|---|---|---|
| 92 kcal/can | 92, kcal/can | Wet food cans |
| 80 kcal/pouch | 80, kcal/pouch | Single-serve wet pouches |
| 380 kcal/cup | 380, kcal/cup | Dry food when you measure by cup |
| 3,850 kcal/kg | 3850, kcal/kg | Dry food when you weigh grams |
| 95 kcal/100g | 95, kcal/100g | Wet food or dry food by weight |
How do treats change my cat's portion?
Treats are easy to forget because they look small. But Cornell Feline Health Center says treats should only be occasional and gives a useful ceiling: do not let treats exceed 10 to 15 percent of daily calories. See Cornell's cat feeding guidance.
For a simple plan, keep treats below that ceiling and subtract them first. If the target is 234 kcal/day and treats are 20 kcal/day, the wet and dry food budget is 214 kcal/day.
How do I split a portion between wet and dry food?
Mixed feeding usually falls into one of three patterns. The wet and dry cat food calculator works through each one with an example.
- Wet/dry split: choose a calorie split, such as 70 percent wet and 30 percent dry.
- Fixed wet first: feed a fixed can, pouch or gram amount, then calculate the dry food left.
- Fixed dry first: feed a fixed gram or cup amount of kibble, then calculate the wet food left.
What should I check after 2 weeks of feeding?
The calculator gives a starting plan. Your cat's body condition and weight trend decide whether the plan is working. Cornell notes that cats vary in how much food they need and recommends working with a veterinarian to maintain a healthy weight.
Weigh your cat regularly if you can. If weight creeps up, reduce carefully. If weight drops unexpectedly, ask your vet.
How do I measure the right food portion for a cat?
Example: kcal per can
If your cat has 220 kcal left for food and the wet food is 110 kcal per can, the daily amount is two cans.
Example: kcal per cup
If your cat has 80 kcal left for dry food and the dry food is 400 kcal per cup, the dry amount is 0.2 cups. That may be easier to measure by grams if you know how many grams are in one cup of that food.
Example: kcal per kg or 100g
Some dry foods list energy as kcal/kg or kcal/100g. In that case, convert to kcal per gram first. BowlMath does this for you when you choose a gram-based unit.
| Label says | Convert to | Example |
|---|---|---|
| 400 kcal/cup | Use cups directly | 80 kcal needs 0.2 cups |
| 3,800 kcal/kg | 3.8 kcal/gram | 76 kcal needs 20g |
| 120 kcal/100g | 1.2 kcal/gram | 60 kcal needs 50g |
Questions
What should I know about measuring the right food portion for a cat?
Start from calories, not from the can or bag size. Work out your cat's daily calorie target, subtract treats, then divide the rest by the kcal per can or cup on the label. Weigh dry food in grams if you can, and check your cat's weight every few weeks.
Is a cup of dry food the same for every brand?
No. The dry foods in the cat food calorie database range from 271 to 604 kcal per cup, so the same scoop can hold about twice the calories from one bag to the next. Always use the kcal per cup for your exact food.
How do I weigh cat food portions?
Put the bowl on a kitchen scale, set it to zero, then add food until the scale shows the grams from the calculator. To use cups instead, weigh one level cup of your food once; the cup to grams chart shows the usual range.
Should kittens and senior cats get a different portion?
Often, yes, because energy needs change with age. Use the kitten or senior setting as a starting point, read the kitten food calculator or senior cat feeding calculator, and ask your vet for a target.
What is the best cat food portion calculator?
The best calculator is the one that uses your cat's weight, body condition and actual food-label calories. BowlMath is designed for that narrow job.
Is measuring dry cat food by cup accurate?
Cups are convenient but less precise than grams. If your cat is gaining or losing weight, weighing dry food in grams is usually the cleaner habit.
Can I use this for kittens?
Yes, but kittens have higher energy needs. Use the kitten setting and ask your vet if growth, appetite or weight changes seem unusual.
Sources
- WSAVA: Calorie needs for an average healthy adult cat (PDF)
- AAFCO: Calorie content on pet food labels
- WSAVA: Body condition score chart for cats (PDF)
Related guides
Check with your vet. BowlMath gives a practical starting estimate, not veterinary advice. Ask your vet before changing portions for kittens, seniors, pregnant or nursing cats, diabetic cats, cats on therapeutic diets, or cats gaining or losing weight unexpectedly.