Senior Dog Calorie Calculator
The prefilled example, a 40 lb dog aged 9, comes to 738–862 kcal a day — midpoint 800.
Enter your dog's details
Use a measured weight from a scale, not a guess.
Half years are fine — 8.5 is allowed. This is the only field that decides the senior check.
Used only for the adult-band comparison line, so you can see the size of the senior reduction.
Feel for the ribs and waist. A healthy score is 4 or 5 out of 9.
Everything is calculated in your browser. The numbers you type are not uploaded and not stored.
Senior daily calorie range
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Senior daily calories
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Midpoint — kcal/day
Calories per kilogram fall as a dog grows and change again as it ages, and neither end of that curve is a straight line. Every page here takes age and weight together and return the daily calories for the band the dog is actually in: a puppy at 3.0 × RER under four months and 2.0 after, a senior on a lower 1.2–1.4 band whose start depends on body size. They all keep the same RER equation and move only the factor, so a change between two birthdays traces to the factor, not to a different formula.
Constants this page uses, and where each one comes from
| Constant | What it is | Named source |
|---|---|---|
| 70 | RER scaling constant, 70 × kg0.75 | AAHA energy-requirement tables, as named on this page |
| 0.75 | exponent applied to body weight in kilograms | AAHA energy-requirement tables, as named on this page |
| 1.2 – 1.4 | factor band for senior, typical activity | AAHA energy-requirement tables, as named on this page |
| 1.0 – 1.2 | factor band for sedentary, or prone to weight gain | AAHA energy-requirement tables, as named on this page |
| 1.4 – 1.6 | factor band for typical adult, spayed or neutered | AAHA energy-requirement tables, as named on this page |
| 1.6 – 1.8 | factor band for typical adult, intact | AAHA energy-requirement tables, as named on this page |
| 1.6 – 2.0 | factor band for light work or very active | AAHA energy-requirement tables, as named on this page |
Where to start
Open the Dog Calorie Calculator by Age first. It shows the daily kcal at every life-stage band in one place, so you can see where the band your dog is in sits relative to the one before and after it.
What every tool here assumes
One set of inputs and one set of published constants, listed once here rather than repeated on every page.
- Resting energy requirement. RER = 70 × (body weight in kg)0.75, the same starting point as every other calculator on the site — age changes the factor, never the equation.
- Puppies: one cut, at four months. Under four months the factor is 3.0 × RER, from four months 2.0 × RER, and the puppy page makes that one cut and nothing finer, with age entered in months and halves allowed.
- The senior line is set by size, not by a birthday. A large breed is treated as senior from about 7 years, a medium breed from about 9, a small breed from about 10, using the lower end of each published range.
- The senior factor is lower than the adult one. 1.2–1.4 × RER against 1.4–1.6 for a typical neutered adult at the same weight — same dog, same weight, lower band.
- Weight conversion. 1 lb = 0.45359237 kg, and the exponent is applied to kilograms.
- Premise. For a dog still growing, the pages work from the current weight you enter rather than projecting an adult size, and growth-plate or large-breed feeding decisions belong to your veterinary team.
The other tool families
Age & Growth is one of six families on the site. The other five are Calories & Feeding, Feline, Pregnancy & Special Conditions, Food Safety, and Breed & Body Condition.