Free Dog Water Intake Calculator
This dog water intake calculator shows how much water your dog needs each day from its weight.
Dog water intake chart by weight
| Weight | Typical per day | See a vet if over |
|---|---|---|
| 5 lb (2 kg) | 4–5 oz | 8 oz |
| 10 lb (5 kg) | 8–9 oz | 15 oz |
| 20 lb (9 kg) | 15–18 oz | 31 oz |
| 30 lb (14 kg) | 23–28 oz | 46 oz |
| 40 lb (18 kg) | 31–37 oz | 61 oz |
| 50 lb (23 kg) | 38–46 oz | 77 oz |
| 60 lb (27 kg) | 46–55 oz | 92 oz |
| 80 lb (36 kg) | 61–74 oz | 123 oz |
| 100 lb (45 kg) | 77–92 oz | 153 oz |
How the dog water intake calculator works
- Typical need: 50–60 ml per kg of body weight a day (about 0.8–0.9 fl oz per lb).
- Warning level: more than about 100 ml per kg a day on a regular basis.
- 1 cup = 8 fl oz ≈ 237 ml.
Puppies, nursing mothers, working dogs and dogs in hot weather need more. Related: dog food calculator.
Frequently asked questions
How does the dog water intake calculator work?
It uses the common veterinary guide of about 50 to 60 ml of water per kg of body weight a day, which is close to 1 fluid ounce per pound. That matches the NRC rule of about 1 ml of water per calorie the dog needs.
How much water should a dog drink a day?
Roughly 1 ounce per pound of body weight. A 40 lb dog needs about 4 cups a day, more in hot weather or after exercise.
How much water is too much?
Regularly drinking more than about 100 ml per kg a day (about 1.5 oz per lb) can be a sign of diabetes, kidney disease or other problems. See your vet if your dog suddenly drinks much more than usual.
Does wet food count?
Yes. Canned food is about 75–80% water, so dogs on wet food drink less from the bowl.