Wet vs dry food split
Enter your pet's daily kcal target and the percentage split you want. The calculator returns daily grams of wet food and daily grams of dry kibble.
Defaults use typical kcal densities; override with values from your specific bag/can.
How this works
wet_grams = (kcal × wet_fraction) ÷ wet_density · dry_grams = (kcal × dry_fraction) ÷ dry_density
The split adds to 100%. The calorie target stays constant; only the form of food changes.
Sources: Manufacturer label kcal/g disclosures (per AAFCO requirements). NRC 2006 for kcal targets — use our dog or cat calorie calculator for the daily target.
Why the moisture content matters
Dry kibble is 8–10% water; canned wet food is 70–80%. That difference matters most for cats, whose evolutionary heritage as desert predators left them with a notoriously blunt thirst response — cats don't reliably feel thirsty until they're already 3–4% dehydrated, while dogs respond at ~1%. Cats on dry-only diets exist in a state of chronic, low-grade dehydration that the bowl alone often fails to correct.
That chronic underhydration is implicated in the two most common feline health crises in the literature: chronic kidney disease (affecting ~30% of cats over 10, per AAFP-AAHA Life Stage Guidelines) and feline lower urinary tract disease (FLUTD), where dilute urine helps flush crystals before they obstruct. Adding even partial wet food meaningfully shifts the math. Dogs are less sensitive but seniors and dogs with diagnosed CKD benefit similarly.
When to feed wet vs dry
The split isn't one-size-fits-all. Puppies and kittens under 4 months often do better on a mixed split — wet food is more palatable and easier to chew during teething, while a small amount of kibble introduces variety and dental abrasion. Senior pets with worn or missing teeth shift toward wet (50–100%). Sick days — gastroenteritis, post-surgical recovery, fever — almost always favor wet, because palatability and hydration are the bottleneck, not calorie density. WSAVA Global Nutrition Guidelines flag the daily nutritional assessment as the right framing: re-evaluate the split as the pet's condition changes, don't lock in one ratio for life.
Reading the calorie-density label
Per AAFCO labeling rules, any complete-and-balanced pet food sold in the US must disclose "metabolizable energy" (ME) in kcal per kilogram of product, and usually per cup or per can. That's the number to plug into this calculator — not the calories-per-100g listed in nutrition databases, which often reflect gross energy (what a bomb calorimeter measures), overstating digestible calories by 10–15%. The label number reflects what the manufacturer measured in digestion trials.
Two common label traps: (1) some bags list kcal "per cup" using a sample-cup size different from the standard 8 oz cup most owners use — read the small print. (2) Canned food labels often quote per-can totals; multiply through if you're feeding partial cans. When numbers seem off, the FEDIAF Nutritional Guidelines provide cross-checks against EU labeling standards, which use similar ME math.
Frequently asked questions
Is mixing wet and dry food okay?
Yes — and often better than either alone. Wet food adds hydration and palatability; dry kibble adds calorie-density and (some) dental abrasion. A 50/50 split is common in households where the cat or dog likes both. The key is keeping total daily calories at the maintenance target — the calculator handles the math.
What's a typical kcal/g for each?
Dry kibble: 3.0–4.5 kcal/g (average ~3.5). Canned wet food: 0.8–1.2 kcal/g (average ~1.0). Read the calorie content on your specific bag/can — labeled "ME" (metabolizable energy) per kg or per cup/can. The calculator defaults to typical averages but accepts your specific values.
Does the order matter (feed wet first, then dry)?
Behaviorally yes for some pets. Some cats and dogs prefer wet food (higher palatability) — feeding wet first satisfies the initial hunger, then dry follows as filler. For others, mixing the two is fine. There's no nutritional reason to insist on one order.
Why not just go wet-only or dry-only?
You can — both work nutritionally if the food is complete-and-balanced. Wet-only is excellent for cats (hydration, urinary health) but expensive. Dry-only is cheaper but lower hydration. A split captures most of the wet-food upside at lower cost.
What about senior cats or cats with kidney disease?
Push the wet share to 70–100%. For an IRIS-staged CKD cat or any senior cat with elevated kidney values, the moisture from canned food is one of the highest-leverage interventions you can make at home — sustained dehydration accelerates CKD progression. The "wet is expensive" framing in the answer above does NOT apply to these cats; the wet food IS the therapy. Coordinate with your vet on a renal-formulated wet diet (Hill's k/d, Royal Canin Renal, Purina NF) once stage 2+ is diagnosed.