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Dog Food Calculator: How Much to Feed Your Dog

Enter your dog's weight and age and we'll work out the daily calories, cups, and meals — straight from the Merck Vet Manual, AAFCO, and AKC, with every number linked to its source. We don't sell or rank any food.

Calculate your dog's daily amount

We treat dogs as adults from about 12 months (AKC's line for most dogs). Large and giant breeds grow longer — see our breed feeding charts for the exact timing.

Three tiers from the Merck Vet Manual — pick the one that fits best.

This plan is general guidance for a healthy dog. If your dog has a health condition — or is a senior whose needs are changing — your veterinarian should be the final word.

Example: a 30 lb adult dog

🐕 Here's the plan for your dog

Healthy adult dog · 3 years old · 30 lb · neutered/spayed

794 cal/day · ~2.3 cups · 2 meals/day

🍽 HOW MUCH YOUR DOG SHOULD EAT

Your dog needs about 794 calories a day based on weight and age.

Here's what that looks like in your kitchen:
📏 ~ 227 grams on a kitchen scale
🥤 ~ 2.3 standard measuring cups (the 1-cup kind)
☕ ~ 1.1 large coffee mug worth
Split into 2 meals a day:
≈ 397 calories per meal (~113 g / ~1.1 cup)
📦 One quick thing:every brand has slightly different calories per cup. Your bag's label tells you exactly — look for “kcal per cup” and divide 794 by that number for your real cup count.
💧 Water~30 oz/day▼

A good rule of thumb: most dogs need about 44–66 mL of water per kg of body weight each day — that's roughly ⅔ to 1 ounce per pound. The numbers below use the higher end as a safe target — most dogs settle in somewhere in this range.

For your 30-pound dog, that's:
💧 ~ 30 oz / ~ 887 ml a day
🥤 ≈ 3.8 measuring cups
🍶 ≈ 1.9 standard 16-oz water bottles (Aquafina / Poland Spring size)

Keep the bowl filled with fresh water.

🍬 Treatsup to 79 cal/day▼

Treats are great for training and bonding — but they should be the bonus, not the main course.

The 90/10 rule keeps things balanced:
  • • 90% of daily calories from real dog food
  • • 10% from treats, chews, table scraps — anything extra
For your 30-pound dog at 794 calories/day, that means up to 79 calories from treats.
💡 Don't forget the small stuff. That bite of cheese you sneak them, the piece of chicken from dinner, the dental chew before bed — it all counts toward the 10%. Adds up faster than most of us expect.
🛒 How to choose dog food▼

Walking into the pet store can be overwhelming. But you only need to check the back or side of the dog food bag for these things:

  • ☐ The bag has an AAFCO Nutritional Adequacy Statement that mentions “adult maintenance”
    Look for a full sentence on the back or side of the bag containing both “AAFCO” and “adult maintenance”. Typical wording is one of two formats:
    • “[Brand] is formulated to meet the nutritional levels established by the AAFCO Dog Food Nutrient Profiles for adult maintenance.”
    • “Animal feeding tests using AAFCO procedures substantiate that [Brand] provides complete and balanced nutrition for adult maintenance.”
  • ☐ “Calories per cup” is printed on the bag
    Usually in the feeding guide section. You need this number to know exactly how much to scoop for your dog.

🚫 FOODS TO KEEP AWAY FROM YOUR DOG

Some everyday human foods are dangerous — even tiny amounts can cause serious harm. Keep these well out of reach:

Never feed: chocolate, xylitol (sugar-free gum / candy / some peanut butters), grapes, raisins, onions, garlic, macadamia nuts, alcohol, caffeine, avocado.

⚠️ Xylitolis a sweetener that's safe for humans but can be deadly to dogs. If your dog ingests anything containing xylitol, call your vet right away.

A few feeding habits to skip:
  • Free-feeding (leaving food out all day). It sounds convenient but makes portion control and weight monitoring much harder.
  • Switching food suddenly. Transition over 7-10 days — mix the new food with the old in growing proportions to avoid an upset stomach.

📚 WHERE WE GOT ALL THIS

Every number and recommendation above comes from one of these sources. Tap any (▼) citation throughout the page to see the original wording. Full source documents are linked below.

  • MERCK — Merck Veterinary Manual ↗The Merck Veterinary Manual (published as MSD Veterinary Manual outside the U.S. and Canada) is a free, comprehensive veterinary reference used by veterinarians, students, and pet owners worldwide. Its nutrition chapters are authored by named board-certified veterinary nutritionists.
  • AAFCO — Association of American Feed Control Officials ↗AAFCO is a non-profit organization of U.S. state and federal feed-control officials that develops model regulations and nutrient profiles for pet food. Every dog food sold in the U.S. must meet AAFCO's standards to be marketed as 'complete and balanced'.
  • AKC — American Kennel Club ↗The AKC is the largest U.S. registry of purebred dogs and a widely-cited authority on general dog care, breed information, and owner education. Its Chief Veterinary Officer and expert advice column publish nutrition guidance for everyday dog owners.
  • FDA — U.S. Food and Drug Administration ↗The FDA is the U.S. federal agency that regulates food and drug safety, including pet food. Its Center for Veterinary Medicine publishes safety alerts about ingredients and household items toxic to pets.
  • PMC — PubMed Central (NIH) ↗PubMed Central is a free archive of peer-reviewed biomedical and life-sciences research curated by the U.S. National Library of Medicine (NIH). Papers cited here are open-access primary sources.

Last verified: 2026-05-23

❤️ A friendly reminder: this is general guidance, not a custom plan for your dog.

The plan above reflects what the Merck Veterinary Manual, AAFCO, AKC, and the FDA publish for dogs matching your dog's age, weight, and life stage. But every dog is different — habits, digestion, and individual quirks aren't in our data.

If something seems off, or you just want a second opinion, your vet is the right call. We've put together some talking points below to make that conversation easier ↓

🩺 QUESTIONS TO BRING TO YOUR VET

Save or print this list and bring it to your next visit.

  1. ❓ “What body condition score is my dog at now, and what's the ideal?”
    Why ask: The 1-9 body condition score is the standard vets use to tell if your dog is at a healthy weight.
  2. ❓ “Are there any preventive screenings you'd recommend for my dog at this age?”
    Why ask: Your vet may suggest age-appropriate checks based on your dog's size, history, and lineage.

How this calculator works

The example plan and every answer above read from the same formulas, so the numbers never disagree.

Common questions

How many calories does my dog need per day?
It comes from the Merck Veterinary Manual's resting energy formula — 70 × (body weight in kg) raised to the 0.75 power — then multiplied for life stage: about 3× for puppies under 4 months, 2× for older puppies, and 1.4–1.8× for healthy adults depending on spay/neuter status. Enter your dog's weight and age and the calculator does the math, with the Merck quote linked.
How much should I feed my dog by weight?
Weight sets the calorie target; the cups depend on your specific food. Every bag prints a 'kcal per cup' figure — divide your dog's daily calories by that number to get the exact cups. We show calories, grams, and an approximate cup count, and point you to the kcal-per-cup figure on your bag.
Does my dog's breed change how much to feed?
For calories, no — the math is weight, age, and spay/neuter status. Breed mainly changes when a puppy becomes an adult: the AKC says small breeds transition around 12 months, large breeds around 15, and giant breeds around 18+. For a breed-specific chart, see our breed feeding guides.
How many meals a day should my dog eat?
The AKC's schedule by age: four meals a day from 6–12 weeks, three from 3–6 months, then twice a day from 6 months and through adulthood.
My dog is overweight — should I feed less?
The Merck Veterinary Manual uses a lower multiplier (1.4 × resting energy) for weight-prone adult dogs, versus 1.6 for neutered and 1.8 for intact. Choose 'prone to weight gain' to use it — but set any real weight-loss plan with your veterinarian.

Want it dialed in for your breed?

Our breed feeding charts add the exact puppy-to-adult timing and breed-specific notes.

Prefer a printable feeding chart by weight? →