How it works
A common guide is around 40–60 ml of water per kilogram each day in total. A 4 kg cat needs roughly 160–240 ml — but much of that can come from wet food.
Cats have a weak thirst drive, so many on wet food barely drink from a bowl, and that can be normal. Cats on dry food need to drink more. Fountains and bowls placed away from food can help.
A noticeable, lasting increase in drinking — refilling the bowl more often, or bigger clumps in the litter tray — is a reason to book a vet check.
Quick reference
| Weight | Daily water |
|---|---|
| 2.5 kg | 100–150 ml |
| 3 kg | 120–180 ml |
| 4 kg | 160–240 ml |
| 5 kg | 200–300 ml |
| 6 kg | 240–360 ml |
| 7 kg | 280–420 ml |
Typical total daily water for healthy adult cats at 40–60 ml per kg, including water from food.
Questions
How much water should a cat drink?
Around 40–60 ml per kg each day in total, including water from food. A 4 kg cat needs about 160–240 ml, and wet food can provide much of it.
My cat hardly drinks — is that a problem?
Often not, especially on wet food. Watch for signs of dehydration such as dry gums or lethargy, and see a vet if your cat also stops eating or seems unwell.
Why is my cat suddenly drinking more?
A lasting increase can have several causes that need a vet to check, especially in older cats. Note how much they drink for a few days and book an appointment.
General guidance for healthy pets, not veterinary advice. Needs vary — your vet can advise for your pet.