Wet + Dry Dog Food Calculator
A 50 lb spayed adult needs 1,164 kcal a day. One 380 kcal can eats 33% of that, leaving 784 kcal, roughly 2 ⅛ cups of a 375 kcal/cup kibble, which is the example loaded below. Feeding cans and kibble together is the most common way dogs get quietly overfed, because the can lands on top of a full kibble portion instead of replacing part of it.
Split the total across two meals for adults (three or four for puppies). Wet food left out spoils in about 2 hours; refrigerate opened cans up to 3 days.
How the mix math works
Same starting point as the main dog food calculator: daily calories from
RER = 70 × kg0.75 times a life-stage factor. Then subtract the wet food and convert
what remains into kibble cups:
- Daily target (MER) = RER × life-stage factor
- Calories from wet = cans × kcal per can (from the label)
- Calories left for kibble = MER − wet calories
- Kibble cups = leftover calories ÷ your kibble's kcal/cup
If wet calories exceed the daily target, kibble goes to zero and you cut the cans (or accept that the can alone is already the full day).
Worked example (matches the defaults above)
A 50 lb (22.7 kg) spayed/neutered adult, one 380 kcal can per day, and a 375 kcal/cup kibble:
| Step | Math | Result |
|---|---|---|
| RER | 70 × (50 × 0.45359237)0.75 | ≈ 727 kcal |
| Daily target (× 1.6) | 727 × 1.6 | ≈ 1,164 kcal/day |
| From one can | 1 × 380 | 380 kcal (~33% of the day) |
| Left for kibble | 1,164 − 380 | ≈ 784 kcal |
| Kibble cups | 784 ÷ 375 | ≈ 2⅛ cups/day (about 1 cup per meal if feeding twice) |
That is the trap owners miss: the bag chart still says ~3 cups, but after a can you only have ~2 cups of calorie room left. Feeding "the chart plus a can" quietly adds hundreds of kcal a day.
Need the kcal/can or kcal/cup line on the package? How to read dog food calorie labels. Breed-level starting charts: feeding by breed. Changing to a new food? The food transition calculator holds calories flat across the switch. Formula sources: About & methodology (NRC / WSAVA / AAHA framing).
Frequently asked questions
Why mix wet and dry dog food?
Palatability and hydration are the big wins: wet food is ~75% moisture and most dogs find it more exciting, while kibble keeps cost per calorie low. The mistake to avoid is feeding the full kibble portion plus a can on top: a standard 12.5 oz can is 350–450 kcal, a quarter of a mid-size dog’s entire day.
How many calories are in a can of dog food?
It varies more than kibble: small 3 oz cans run 70–110 kcal, 5.5 oz cans about 150–200, and 12.5–13 oz cans 350–450. The exact number is printed on the label as kcal/can. Use that number in the calculator, not an average. See how to read calorie lines on pet food labels.
What ratio of wet to dry is best?
There’s no nutritionally required ratio; both are complete foods. Common patterns: a spoonful of wet as a topper (5–10% of calories), a 25/75 split for picky eaters, or 50/50 for dogs that need more moisture. Pick by budget and your dog’s preference, and let this calculator keep total calories fixed.