How much water should a cat drink a day?

The numbers by body weight

Total daily need: 3 kg cat ≈ 150–180 ml, 4 kg ≈ 200–240 ml, 5 kg ≈ 250–300 ml, 6 kg ≈ 300–360 ml. On a wet-food diet, food supplies roughly 70–80% of that, so a 4 kg cat may only drink 30–60 ml from the bowl — that is normal, not a problem. On dry food only, nearly all of it must be drunk: 180–220 ml a day for the same cat, which is a lot for an animal with a weak thirst drive, and most cats fall short.

Why dry-fed cats run a chronic deficit

Dry food is about 8–10% moisture; wet food is 75–80%. Studies of cats fed exclusively dry food consistently find lower total water turnover and more concentrated urine than wet-fed cats. Concentrated urine is the shared risk factor behind struvite crystals, urinary blockages and added strain on ageing kidneys.

How to measure what your cat actually drinks

Fill the bowl with a measured amount using a kitchen scale (1 ml water = 1 g), cover any other water sources for the day, and re-weigh after 24 hours. Do it for three days and average, and place an identical bowl the cat cannot reach to correct for evaporation. Repeat monthly for a cat over seven.

When drinking a lot is the warning sign

Drinking clearly more than 100 ml per kg per day — a 4 kg cat emptying more than 400 ml — is excessive thirst (polydipsia) and warrants a vet visit. The usual causes are chronic kidney disease, hyperthyroidism and diabetes, and all three are far more treatable when caught early. Sudden increases matter more than the absolute number.

Practical ways to raise intake

Feed at least one wet meal a day. Use wide, shallow ceramic or steel bowls so whiskers do not touch the sides, and place several around the home, away from food and the litter tray. Refresh twice a day; many cats reject water that has sat overnight. Try a fountain — a large share of cats prefer moving water. Splashing a tablespoon of warm water into wet food raises intake without changing the diet.

When taste is the missing lever

Some cats simply will not drink more plain water no matter how it is presented. That is the gap Cat Soda was developed to close in Switzerland: a still, sugar-free, lactose-free functional drink cats actually want, with premium poultry hydrolysate for taste, taurine for heart and eye health, and a premium omega-3 source for skin, coat and joints. It sits alongside fresh water and a balanced diet — never instead of them.

FAQ

How much water should a cat drink per day?

Roughly 50–60 ml per kg of body weight in total per day, including the water in food. A 4 kg cat needs about 200–240 ml a day.

How much should a cat on wet food drink from the bowl?

Often only 30–60 ml a day, because wet food is 75–80% water and supplies most of the requirement. Low bowl intake on a wet diet is normal.

Is my cat drinking too much water?

More than about 100 ml per kg per day, or a clear sudden increase, suggests excessive thirst. Book a vet check for kidney disease, hyperthyroidism or diabetes.

How do I measure my cat's water intake?

Weigh the bowl before and after 24 hours (1 g = 1 ml), average over three days, and use a second identical bowl out of reach to correct for evaporation.