This free senior dog food calculator tells you how much food an older dog needs each day, in grams, from weight, body shape and activity, with a lower-calorie portion that protects joints. It runs fully in your browser, so nothing you type is sent to a server, and you need no account and no sign-up to use it.
Many dog owners guess the daily amount, and guessing is where most feeding problems start. Too much food over months quietly adds fat, while too little food leaves a dog thin, tired, and hungry. A simple calculation based on weight and energy gives you a fair starting point instead of a guess.
To use the tool, type in Dog weight (kg), Body shape, Activity level, Food energy (kcal per kg), Meals per day. Press the calculate button and the tool shows the result at once. If you change any number, press calculate again to see the new result right away.
The result is a guide for a healthy dog, not a medical order. Dogs differ in breed, age, health, and daily life, so use the number as a starting point, then watch weight and body shape over the next few weeks and adjust in small steps.
Example: a 12 kg senior dog at ideal weight with normal activity needs about 632 kcal a day, which is about 186 grams of a 3,400 kcal per kg food, or about 93 grams per meal.
Keep older dogs lean. Extra weight is hard on ageing joints, so a slightly lower portion that keeps the waist visible is usually kinder than a generous one.
Split the food into two or three meals. Older dogs often digest smaller meals better, and a regular routine helps dogs with stiff mornings.
Watch muscle, not just weight. An older dog can lose muscle while keeping the same weight, so check that the ribs are easy to feel but not sharp, and talk to your vet about protein.
Common question: Why do senior dogs often need fewer calories? Their metabolism slows and they usually move less, so the same portion that kept an adult dog steady can slowly add fat in an older dog.
Common question: What age counts as senior? Small dogs are often senior around 10 years, medium dogs around 8, and large dogs around 6 or 7. Breed and health matter more than a single birthday.
Common question: Should I change to a senior food? A senior recipe can help, but the amount matters more than the label. If your vet is happy with the current food, adjusting the portion is often enough.
Keep a simple notebook for a month. Write the daily grams, the weight each week, and any notes about energy, coat, and stools. That short record turns a vague feeling that something changed into clear evidence you can show your vet, and it makes the next adjustment much easier to judge.
A steady routine helps more than a perfect bowl. Feed at the same times, measure with scales, keep fresh water out, and give walks and play at regular hours. Dogs settle well into routines, and a settled dog is easier to weigh, easier to watch, and easier to feed well.
Finally, check the food bag for feeding guidance and compare it with this result. If the bag guide and this tool differ a lot, start between the two numbers and let the weight of your dog over two weeks decide the final amount. Write both numbers down so you can compare them again after the first weighing.
This tool is free to use as often as you like. Bookmark it, recheck the numbers when your dog grows, changes food, or changes activity, and keep the daily routine steady. Small, steady habits matter far more for a dog than any single perfect number.