Why
Watermelon is on VCA's list of treats that are fine in moderation. VCA advises removing rinds, seeds and peels from any fruit.
How to serve watermelon
- Cut a few small cubes of red flesh.
- Remove all seeds and the rind.
Watch out for
- Fruit sugar adds up quickly for a small cat.
- Rind is hard to digest.
How much watermelon can a cat eat?
Treats of every kind should stay under 10% of a cat's daily calories. Here is that daily treat budget by size, and how much watermelon it buys if watermelon is the only treat that day. Watermelon has about 30 kcal per 100 g; 1 cup, diced (152 g) is about 46 kcal.
| Cat size | Daily treat budget | Max watermelon a day |
|---|---|---|
| Small cat (6 lb) | 18 kcal | 59 g (half of cup, diced) |
| Average cat (10 lb) | 26 kcal | 87 g (half of cup, diced) |
| Large cat (14 lb) | 34 kcal | 112 g (two thirds of cup, diced) |
Less is better for overweight or diabetic cats. Work out your own cat's numbers with the cat food calculator. Calories: USDA FoodData Central, Watermelon, raw.
Other fruit: quick answers
| Food | Verdict | Short answer |
|---|---|---|
| Citrus fruit | Avoid | Best avoided. Citrus oils and acid can irritate, though a small taste usually only upsets the stomach. |
| Bananas | Small amounts | A small piece now and then. Bananas are safe but high in sugar. |
| Coconut | Small amounts | A very small amount is unlikely to cause harm, but it can upset the stomach. |
| Peaches | Small amounts | A small piece of peeled flesh is fine. Never the pit, stem or leaves. |
| Grapes | Toxic | No. Grapes are on vets' do-not-feed lists for pets. |
| Raisins | Toxic | No. Raisins are on vets' toxic lists for pets, just like grapes. |
Rules for any new food
- Plain is the rule: no salt, butter, oil, onion, garlic, sugar or sweeteners. Most of the danger in human food comes from what is added to it.
- Keep all treats under 10% of your cat's daily calories . The rest should come from a complete cat food.
- Check labels for onion and garlic powder, which turn up in stock, gravy, baby food and seasoned meat.
- If your cat has a health condition, such as diabetes, kidney disease or a sensitive stomach, ask your vet before adding any new food.
Frequently asked questions
Is watermelon safe for cats?
A little seedless flesh is fine. Remove the rind and seeds.
How much watermelon can a cat have?
Treats of any kind should stay under 10% of a cat's daily calories. For an average 10 lb neutered cat that is about 26 kcal a day, or roughly 87 g of watermelon if it is the only treat that day.
Sources
- VCA Animal Hospitals, "Can You Feed Pets Certain Fruits and Veggies?"
- Pet Nutrition Alliance, "Calculating Calories Based on Pet Needs"
- USDA FoodData Central, SR Legacy (April 2018 release)
Checked October 17, 2026. We are a reference, not a vet: if in doubt, call yours. How we check.