To mix wet and dry food, split your cat's daily calories, not the portions. A spayed indoor 10 lb cat needs about 260 kcal a day. If half comes from wet food, that is about 1.5 small 3 oz cans plus one third of a cup of dry. The common mistake is feeding a full wet portion and a full dry portion, which quietly doubles the calories.
Step 1: find the daily calorie total
Start with the cat's total energy need. Vets calculate it from the resting energy requirement (70 x kg to the 0.75 power) times a factor: 1.2 for a spayed or neutered adult, 1.4 for an intact adult, 1.1 for a quieter senior.
| Cat weight | Spayed or neutered (x1.2) | Intact (x1.4) | Senior (x1.1) |
|---|---|---|---|
| 6 lb | 178 kcal | 208 kcal | 163 kcal |
| 8 lb | 221 kcal | 258 kcal | 202 kcal |
| 10 lb | 261 kcal | 305 kcal | 239 kcal |
| 12 lb | 299 kcal | 349 kcal | 274 kcal |
| 14 lb | 336 kcal | 392 kcal | 308 kcal |
Use the cat's ideal weight, not its current weight, if it is overweight. The cat food calculator does this step for you.
Step 2: choose the split
There is no single correct ratio. Pick the one that fits your cat and your budget:
- 25% wet: one small wet meal a day, dry food for the rest. The cheapest way to add some water to the diet.
- 50% wet: a wet breakfast and dinner, dry food in between or in a puzzle feeder. A common choice for indoor cats.
- 75% wet: mostly wet, with a little dry for grazing. Often suggested for cats with a history of urinary problems, because wet food is about 75 to 80% water.
Step 3: turn calories into grams, cans and cups
Here is the 10 lb spayed cat (261 kcal a day), with a typical wet food of 85 kcal per 100 g (about 80 kcal per 3 oz can) and a dry food of 400 kcal per cup:
| Split | Wet food | Dry food |
|---|---|---|
| 25% wet, 75% dry | 65 kcal: about 77 g, or 0.8 of a 3 oz can | 196 kcal: about 1/2 cup |
| 50% wet, 50% dry | 131 kcal: about 154 g, or 1.6 cans | 131 kcal: about 1/3 cup |
| 75% wet, 25% dry | 196 kcal: about 230 g, or 2.4 cans | 65 kcal: about 1/6 cup |
Your foods will have different calorie counts, so swap in the numbers from your labels. Wet labels in the US usually show kcal per can or per kg; dry labels show kcal per cup and per kg. If you only have kcal per kg, divide by 10 to get kcal per 100 g.
Measure the dry part by weight if you can
At these amounts, small errors matter. A "third of a cup" scooped loosely versus packed can differ by 20%, which for a cat is a whole snack. A $10 kitchen scale removes the guesswork: weigh the dry portion in grams once, then use the same scoop mark every day.
How to schedule a mixed diet
- Serve the wet portion as meals, and take it up after about 30 minutes. Wet food left out for hours dries and spoils.
- Measure the day's dry portion into one container each morning. When it is empty, the dry food is done for the day, no matter how convincing the cat is.
- Refrigerate the unused part of a can, covered, and use it within two to three days. Many cats prefer it warmed slightly to room temperature.
Check after four weeks
Weigh your cat before you start and again after four weeks. If weight creeps up, trim the dry part first, since it is the most calorie dense. If the cat is losing weight it should not, add about 10% to the total. Our guides on feeding only wet food and wet vs dry cat food cover the single-type plans.
For the full monthly budget beyond food, see how much a cat costs per month.
FAQ
Is it OK to mix wet and dry cat food in the same bowl?
Yes, nutritionally. Practically, separate bowls are better: the wet part should be cleared within 30 minutes, while dry can stay out longer.
How many cans of wet food per day if I also feed dry?
It depends on the split. For a 10 lb spayed cat, one small 3 oz can a day covers roughly 30% of its calories, so the dry portion drops to about 0.45 cup on a 400 kcal/cup food.
Does a mixed diet cost more?
Yes, wet food costs more per calorie, usually 30 to 60% more in the US. The cat cost calculator shows what a given split does to the monthly bill.