Free dog calculator
Dog Calorie & Food Calculator
This dog calorie calculator uses the resting and maintenance energy formulas in the Merck Veterinary Manual to estimate how many calories your dog needs a day. Add the calories per cup from your dog food bag and it works out how much to feed, with a 10% allowance left for treats.
- Merck’s resting and maintenance energy formula
- Turns calories into cups of your own food
- Free, no sign-up or email
This is a starting point for a healthy dog, not a prescription diet. Dogs with a medical condition, or that need to lose weight, should have their calories set by a vet.
How the dog food calculator works
It starts with resting energy requirement (RER), the energy a dog uses at rest. Merck gives the formula as 70 times body weight in kilograms raised to the 0.75 power, which works for dogs of any size. RER is then multiplied by a life-stage factor to get the maintenance energy requirement (MER) for a moderately active dog.
For an 11 lb miniature dachshund, about 4.99 kg, RER comes to 234 kcal. As a neutered adult at 1.6 times RER, that’s about 374 kcal a day. Ten percent of that, about 37 kcal, is the treat budget AKC and Purina both recommend staying under.
| Life stage (Merck) | Multiply RER by |
|---|---|
| Neutered adult | 1.6 |
| Intact adult | 1.8 |
| Gains weight easily | 1.4 |
| Puppy under 4 months | 3 |
| Puppy 4 months+ | 2 |
Daily calories by weight
| Weight | RER | Neutered adult | Intact adult | Gains easily |
|---|---|---|---|---|
| 8 lb | 184 | 294 | 331 | 258 |
| 11 lb | 234 | 374 | 421 | 327 |
| 16 lb | 310 | 495 | 557 | 433 |
| 25 lb | 433 | 692 | 779 | 606 |
| 32 lb | 521 | 833 | 937 | 729 |
| 50 lb | 727 | 1164 | 1309 | 1018 |
| 70 lb | 936 | 1498 | 1685 | 1311 |
Calories are kcal per day, worked from Merck’s formula and rounded. Merck notes that any calculated intake is only a starting point. Two dogs of the same weight can need as much as 30% more or less, so your dog’s waistline over the next month is the real test.
What changes the answer
Spay or neuter
Merck’s factor drops from 1.8 for an intact adult to 1.6 for a neutered one, about an 11% cut.
Easy keepers
For dogs that gain weight easily, Merck uses 1.4. If your dog keeps gaining on the standard amount, this is the factor to talk over with your vet.
Growing puppies
Puppies need 3 times RER before 4 months and 2 times after, so the same weight needs far more food at 10 weeks than at a year.
The food itself
Calories per cup range widely between brands. Two foods at the same cup measure can differ by a lot, so always use your bag’s kcal figure.
Weigh the food instead of scooping it
Ask on r/Dachshund how to work out the right amount of food and the answers split two ways: go by the bag, or get a kitchen scale. The scale has research on its side. In a 2011 analysis of 12 studies, Alexander German and colleagues found that portions measured with cups ranged from an 18% underestimate to an 80% overestimate, and the error grew as portions got smaller. A dachshund’s ration is about as small as dog portions get.
The calorie statement on a bag of dog food gives kcal per kilogram, often alongside kcal per cup. Enter the kcal per kg in step 3 and the calculator gives grams. For a neutered dog, with 10% set aside for treats, it works out like this:
| Dog | Food calories a day | At 3,500 kcal/kg | At 4,000 kcal/kg |
|---|---|---|---|
| 9 lb | 289 kcal | 83 g | 72 g |
| 11 lb | 337 kcal | 96 g | 84 g |
| 16 lb | 446 kcal | 127 g | 111 g |
| 20 lb | 527 kcal | 151 g | 132 g |
| 25 lb | 623 kcal | 178 g | 156 g |
A few grams a day looks like nothing, but for an 11 lb dog, 10 extra grams of a 3,500 kcal/kg food is 35 kcal, about a tenth of the day.
Cooking at home works the same way, as long as you know your recipe’s calories. A homemade diet has no bag label, so ask whoever formulated it, ideally a board-certified veterinary nutritionist, for the calories per kilogram, and enter that in step 3. A recipe that doesn’t give you that figure, or the supplement and its dose, isn’t complete yet. Our homemade dachshund food guide explains why.
The treat budget in real snacks
Ten percent of the day sounds generous until you see it in snacks. We took calories per piece from USDA FoodData Central, and the Cheez-It figure from the brand’s own label, then counted how many fit the treat budget of a neutered 11 lb and 25 lb dog.
| Snack | Calories each | Fits 11 lb dog (37 kcal) | Fits 25 lb dog (69 kcal) |
|---|---|---|---|
| Baby carrot (10 g) | 3.5 | 11 | 20 |
| Plain roasted chicken breast, 1/4 oz (7 g) | 11.7 | 3 | 6 |
| Cheddar cheese, 1/4 oz cube (7 g) | 29.1 | 1 | 2 |
| Peanut butter, 1 tsp (5.3 g) | 31.9 | 1 | 2 |
| Cheez-It Original cracker | 5.6 | 7 | 12 |
This is a calorie count, not a list of approved foods. One teaspoon of peanut butter nearly uses up a miniature dachshund’s whole day of treats, and Merck lists peanut butter among the products that can contain xylitol, which is dangerous to dogs. Check the label first. For ideas that fit the budget better, see our treats for dachshunds.
For how to split the day’s food, see how many times a day to feed a mini dachshund. If your dog is carrying extra weight, our notes on food for overweight dachshunds cover what’s worked for us. Treats count toward the day too, including human snacks like crackers.
Feeding questions
How much should I feed my dog a day?
Work out the calories first, then convert with your food’s kcal per cup. A neutered 25 lb dog needs about 692 kcal a day. With a food at 380 kcal per cup, that’s about 1.6 cups once treats are set aside.
Why is my result lower than the feeding chart on the bag?
Merck notes that maintenance foods are formulated for a moderately active adult eating a reasonable amount. If a dog needs 10% to 30% less than the label suggests to stay at an ideal weight, it says a less energy-dense food may suit it better.
Can I use this for weight loss?
Only as a reference. Merck warns that feeding a maintenance diet in restricted amounts also cuts every other nutrient, since those foods aren’t formulated to be fed that way. Your vet can set a target weight and suggest a food for it.
Sources
- Merck Veterinary Manual, Nutritional Requirements of Small Animals: RER formula, MER factors, the 30% individual range and label guidance (read October 2026).
- American Kennel Club and Purina: treats at or below 10% of daily calories (read October 2026).
- German A.J. et al., Imprecision when using measuring cups to weigh out extruded dry kibbled food, Journal of Animal Physiology and Animal Nutrition, 2011: accuracy range and portion-size effect.
- USDA FoodData Central, SR Legacy records 168568 (baby carrots), 171477 (roasted chicken breast), 170899 (cheddar) and 174266 (peanut butter); Cheez-It Original label on cheezit.com: calories (read October 2026).
- Merck Veterinary Manual, Xylitol Toxicosis in Dogs: peanut butter among xylitol-containing products (read October 2026).