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How much water should a cat drink a day?

Updated October 8, 2026 by madebykamal

Cornell University's Feline Health Center says a cat needs about 4 ounces of water per 5 pounds of lean body weight a day, roughly 52 ml per kilogram, so the average 10 pound cat needs about one cup (about 240 ml). That total counts the water in food, so a cat on wet food may drink much less from the bowl than a cat on dry food. A clear change from your cat's usual drinking, up or down, is a reason to call your vet.

General information, not medical advice. How these guides are made.

Daily water by weight

Using Cornell's figure of 4 ounces per 5 pounds (0.8 ounce per pound) of lean body weight, these are rough daily totals from food and bowl together. VCA Animal Hospitals gives the same baseline. Metric figures are rounded conversions.

A range, not an exact target

The Merck Veterinary Manual gives a broader guideline of about 44 to 66 ml per kilogram of body weight for most mammals at a comfortable temperature, roughly 7 to 10 ounces (200 to 300 ml) for a 10 pound cat. VCA says needs vary with temperature, weight, food type, overall health and activity, and Merck says healthy animals given plenty of water regulate their own intake, so water should generally not be restricted. Because Cornell's figure uses lean weight, ask your vet for an overweight cat's ideal weight.

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Wet food vs dry food

On wet food, food can supply a large share of a cat's water. Cornell says canned cat food is at least 75 percent moisture and dry food 6 to 10 percent, and Merck says cats eating mostly canned food generally drink less than cats eating mostly dry food. International Cat Care (iCatCare) adds that a cat on wet food may rarely, if ever, be seen drinking.

To estimate the water in wet food, multiply the grams eaten by the label's moisture percentage: 150 grams at 78 percent holds about 117 ml, roughly 4 ounces, which leaves about 4 ounces for a 10 pound cat to drink. The Dog and Cat Water Intake Calculator on this site does that subtraction for you.

How to measure what your cat drinks

VCA says measuring how much water your pet drinks in 24 hours helps your vet judge how serious a problem is. iCatCare describes the method:

Signs a cat is not drinking enough

Cornell lists the signs of dehydration below, and says to contact a vet promptly if you are concerned your cat is dehydrated.

To help a cat drink more, Cornell and VCA suggest fresh water in several easy-to-reach spots away from the litter box, bowls washed daily, a fountain for cats that like running water, and wet food or water added to food.

How much is too much, and when to see a vet

iCatCare says a cat drinking more than 100 ml per kilogram a day, about 1.5 ounces per pound, is drinking more than usual: about 450 ml (15 ounces) for a 10 pound cat. It says any cat drinking more than usual should be seen by a vet, particularly above that line, and lists kidney disease, diabetes mellitus, hyperthyroidism and high blood calcium as the most common causes. Cornell says chronic kidney disease affects up to 40 percent of cats over 10, often with no early signs, and that as failing kidneys lose the ability to concentrate urine, cats may drink more to compensate. See your vet for:

Keeping a record with HydroNest

This page is general information, not veterinary advice. Because a change from your cat's usual amount matters more than any single figure, a daily note of bowls filled makes a change easier to spot and to describe to your vet.

HydroNest Family Water Tracker has pet profiles for a dog, cat or other companion. It sets a daily water goal from the pet's weight, based on common veterinary guidance, and logs a bowl with one tap, so each person in the household, and each pet, has their own goal, log and streak on one phone. Only pet-safe drinks are shown. Pet profiles are part of HydroNest Premium, and records stay on your device and in your own iCloud, with no account. HydroNest is a hydration log, not a medical device: for pets, your vet's advice comes first.

Questions people ask

How much water should a 10 pound cat drink a day?

About 8 ounces, one cup (roughly 240 ml), in total, according to both Cornell and VCA. On wet food, much of that can come from the food, so the cat may drink much less from the bowl.

Do cats on wet food still need a water bowl?

Yes. Cornell says cats should have access to clean, fresh water at all times, and the Merck Veterinary Manual says the same. A cat on wet food simply tends to drink less, since canned food is at least 75 percent water.

Is it normal for a cat to rarely drink water?

On a wet diet it can be: iCatCare says a cat fed wet food may rarely, if ever, be seen drinking. If your cat shows signs of dehydration such as lethargy, poor appetite or dry gums, Cornell says to contact a vet promptly.

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