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✅ Free · no signup to see your plan · cups, cans & ounces · Updated October 2026
To switch cat food safely, mix the new food into the old over 7 to 10 days. Start with about 25% new food, move to 50%, then 75%, and finish at 100% new food, holding each step for 2 to 3 days. Go slower, 14 days or more, for sensitive stomachs, and never let your cat go without eating.
| Days | Old | New |
|---|---|---|
| Days 1-2 | 75% | 25% |
| Days 3-4 | 50% | 50% |
| Days 5-6 | 25% | 75% |
| Day 7 | 0% | 100% |
| Days | Old | New |
|---|---|---|
| Days 1-3 | 75% | 25% |
| Days 4-6 | 50% | 50% |
| Days 7-9 | 25% | 75% |
| Day 10 | 0% | 100% |
| Days | Old | New |
|---|---|---|
| Days 1-2 | 90% | 10% |
| Days 3-4 | 80% | 20% |
| Days 5-6 | 70% | 30% |
| Days 7-8 | 60% | 40% |
| Day 9 | 50% | 50% |
| Day 10 | 40% | 60% |
| Day 11 | 30% | 70% |
| Day 12 | 20% | 80% |
| Day 13 | 10% | 90% |
| Day 14 | 0% | 100% |
Percentages are shares of your cat's daily calories. The planner above turns them into measured amounts.
Seven days is enough for many healthy adult cats switching between similar foods. Ten days is the safer default for kittens, seniors and any switch between dry and wet food. Choose 14 days (or longer) if your cat has a sensitive stomach or has had diarrhea after a past food change. Cats on prescription diets for kidney, urinary or digestive disease should switch exactly as their vet says.
A cup of kibble holds roughly 390 calories, while a 3 oz can of wet food holds about 75. If you swap cups for cans one for one, your cat can eat far too little or too much. This example shows a 10 lb spayed or neutered adult (about 261 kcal a day, two meals) moving from dry food to 3 oz cans over 10 days. Amounts are per meal.
| Day | New food | Dry food per meal | Wet (3 oz can) per meal |
|---|---|---|---|
| Day 1 | 25% | ¼ cup (0.9 oz) | 2½ tbsp (1.3 oz) |
| Day 2 | 25% | ¼ cup (0.9 oz) | 2½ tbsp (1.3 oz) |
| Day 3 | 25% | ¼ cup (0.9 oz) | 2½ tbsp (1.3 oz) |
| Day 4 | 50% | 2½ tbsp (0.5 oz) | ¾ can (2.3 oz) |
| Day 5 | 50% | 2½ tbsp (0.5 oz) | ¾ can (2.3 oz) |
| Day 6 | 50% | 2½ tbsp (0.5 oz) | ¾ can (2.3 oz) |
| Day 7 | 75% | 1½ tbsp (0.3 oz) | 1¼ cans (3.8 oz) |
| Day 8 | 75% | 1½ tbsp (0.3 oz) | 1¼ cans (3.8 oz) |
| Day 9 | 75% | 1½ tbsp (0.3 oz) | 1¼ cans (3.8 oz) |
| Day 10 | 100% | - | 1¾ cans (5.3 oz) |
Typical calories assumed (390 kcal per cup, 75 kcal per can). Your food's label is more accurate; enter it in the planner.
Soft stool, gas, a skipped meal or mild vomiting once: step back to the previous ratio for 2 days. Call your vet for repeated vomiting, diarrhea beyond 48 hours, blood, unusual tiredness, or no eating for 24 hours. Read more in our guides to cat diarrhea and cat vomiting.
Mix the new food into the old over 7 to 10 days: about 25% new for days 1-3, 50% for days 4-6, 75% for days 7-9, then 100% new. Measure by calories rather than cups, hold a step if stools soften, and use the planner above for exact amounts for your cat’s weight.
Most healthy adult cats do well with 7 to 10 days. Choose 14 days or longer for sensitive stomachs, seniors, kittens and bigger changes such as dry to wet. Cats on a prescription diet should follow the schedule their vet gives.
It is not recommended. An abrupt change can cause vomiting and diarrhea, and some cats refuse unfamiliar food, which is risky because cats that stop eating can develop liver problems. If you must switch suddenly, offer small amounts and call your vet if your cat eats nothing for 24 hours.
Plan for about 10 days and mix by calories, not volume, because wet food has far fewer calories per ounce. The planner converts each day’s mix into cups of dry food and cans of wet food that add up to the same daily calories.
Go back to the last step your cat accepted and hold it for 2 to 3 days. Warm wet food slightly, try the new food as a small topper instead of a full mix, and never wait out a hunger strike. Call your vet if your cat has not eaten for 24 hours.
Step back to the previous ratio for 2 days until stools firm up, then move forward more slowly. Call your vet if diarrhea lasts more than 48 hours, or comes with vomiting, blood, tiredness or refusing food.
Keep total daily calories steady and change only the mix. A 10 lb spayed or neutered adult needs roughly 260 kcal a day, the same on day 1 as on day 10, just from different foods.
Not long. Cats that eat nothing for 24 to 48 hours risk hepatic lipidosis, a serious fatty liver disease. Call your vet if your cat eats nothing for 24 hours, sooner for kittens, seniors or cats with health conditions.
Most cats move to adult food around 12 months, and large breeds sometimes later; ask your vet. Use the same gradual schedule, choosing the kitten life stage in the planner for the right calories.
Sources: Merck Veterinary Manual and AAHA nutrition guidelines (energy requirements), Cornell Feline Health Center (hepatic lipidosis), standard veterinary food-transition guidance. Educational only; not a substitute for advice from your veterinarian.
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