Dog Food Calculator

How much food a dog needs by body weight

The rough rule canine nutritionists go by ties the daily ration to body weight and life stage. Puppies eat 4–7% of body weight per day because growth burns a lot of energy, adults 2–3%, and seniors around 2%. Example: a 20 kg adult dog needs roughly 400–600 g/day of premium dry food, split into 2 meals. Where you land in that range depends on activity. A couch-potato dog sits at the low end, while an athletic or working dog eats closer to the top. Always read the kcal/kg on the bag too, because premium brands (Premier, Royal Canin, Hill's, ProPlan) pack more calories than standard ones and may need 10–20% less by weight.

Practical applications

It helps with planning meals day to day, heading off canine obesity (which hits 40% of pet dogs in Brazil and shaves 1.5–2 years off their lifespan), and matching portions to how calorie-dense a given brand is. Tweak the amount during weight-loss plans (cut by 10–20%), pregnancy and lactation (1.5–2× the maintenance figure), and recovery after surgery. Spread the daily total across 2 meals for adults and 3–4 for puppies under 6 months.

FAQ

Should I follow the bag's table or this formula? The bag table is a fine starting point. From there, adjust by body condition score: you should be able to feel the ribs without seeing them.

Is wet food different? Yes. Wet food is about 75% water, so for the same calories you need 3–4× the weight of the dry equivalent.

What if my dog is overweight? Cut the daily ration by 10–20%, get more exercise into the routine, and check again after 30 days.

How many meals per day? Adults do well on 2, puppies under 6 months on 3–4, and seniors with a smaller appetite on 2–3.