Dog Calorie Calculator

Recalculate every time your dog's weight changes by more than 10%, after neutering or spaying (reduces needs by 15–20%), when they move between life stages (puppy to adult, adult to senior), and after significant activity changes. For puppies, monthly recalculation is recommended as they gain weight rapidly.

Puppies need 2.5–3× their RER during rapid growth, compared to 1.4–1.8× for a moderately active adult. The exact multiplier varies by breed size: giant breed puppies are kept at 2× RER to prevent dangerously rapid bone growth, which is linked to orthopedic problems in adulthood. As puppies approach adult weight (at 80–100% of expected adult size), their calorie needs drop to adult MER levels.

Senior dogs (7+ years) typically need 15–20% fewer calories than they did as adults due to reduced activity and a slower metabolic rate. Individual variation is significant, though. Some active seniors maintain adult calorie needs. The most reliable guide is body condition score: if your senior is gaining weight, reduce by 10% and reassess after 4 weeks.

A 20% reduction below MER is the standard starting point for safe dog weight loss. This should produce a loss of approximately 0.5–2% of body weight per week, depending on the dog's starting weight. A deficit greater than 25% risks muscle loss and nutritional deficiencies. Always pair calorie restriction with monthly weigh-ins and body condition score monitoring. For obese dogs (BCS 7+), see the body condition score guide and consult your vet. A prescription weight-loss diet may be recommended.

Yes. Neutering and spaying reduce metabolic rate by approximately 15–20% in adult dogs, primarily because sex hormones influence muscle mass maintenance and activity levels. Our calculator applies a 15% reduction for neutered adult dogs. If your neutered dog is gaining weight, try reducing daily calories by an additional 10% and reassess monthly.

Smaller dogs have a higher metabolic rate per kilogram of body weight than larger dogs. That's why the RER formula uses weight raised to the power of 0.75 rather than a simple linear multiplier. A 5 kg Chihuahua needs about 180 kcal/day; a 50 kg Great Dane needs about 1,100 kcal/day. That's a 10× weight difference but only about a 6× calorie difference. Large and giant breeds also have different life-stage thresholds for puppy and senior feeding.

Wet food has approximately 75–85 kcal per 100g, compared to 350 kcal/100g for dry kibble. To convert your kcal target to wet food grams, divide your daily kcal target by your food's kcal/100g (check the label) and multiply by 100. Our dog food calculator handles this conversion automatically across dry, wet, raw, and mixed diets.

For overweight dogs, calculate based on ideal (target) weight, not current weight. An overweight dog at BCS 7/9 may carry 20–30% more weight than their ideal, so using current weight sets the calorie target too high and prevents weight loss. A rough guide: every point above BCS 5 represents approximately 10% excess body weight. A 30 kg dog at BCS 7 likely has an ideal weight of around 24–26 kg, so feed for that, not for 30 kg. For dogs at BCS 5 (ideal), current weight and ideal weight are the same.

More than most owners realize. A single medium dental chew adds 70–130 kcal; a pig ear can add 200–280 kcal. For a 10 kg dog needing 400 kcal/day, that pig ear represents more than half the day's food budget. Veterinary guidelines recommend that treats account for no more than 10% of total daily calories, so on a 500 kcal/day plan the entire treat budget is 50 kcal or fewer. If your dog isn't losing weight despite eating the calculated amount, treats are usually the first thing to audit. Low-calorie alternatives include baby carrots (4 kcal each) and small pieces of plain cooked chicken.

For underweight dogs (BCS 1–3), the goal is a gradual calorie surplus. A 15% surplus above MER is a safe starting point, which is what our calculator's weight-gain mode applies. Rapid refeeding in severely underweight dogs can cause refeeding syndrome, a dangerous electrolyte imbalance, so increases should be gradual: no more than 25% above MER without veterinary guidance. Weigh your dog every 1–2 weeks and aim for a gain of 1–2% of body weight per week. Dogs that are underweight for unknown reasons, especially adult or senior dogs, should be seen by a vet to rule out underlying causes before starting a weight-gain programme.