Dog Health Tracker
Your dog's age in human years, daily calories and food portions, ideal weight and body condition, daily water needs, and your puppy's adult size. Instant answers, built on veterinary formulas.
Dog Age to Human Years Calculator
How this dog age calculator works
The old "one dog year equals seven human years" rule is a myth. Dogs mature very quickly at first: by their first birthday they are roughly like a 15-year-old teenager, and by two they are about 24 in human terms. After that, each dog year counts as roughly 4–6 human years, depending on size.
Size matters because small dogs generally live longer than big dogs, which means large breeds "age" faster in their later years. That's why the calculator asks for your dog's adult size:
- Small: up to 9 kg (20 lb) when fully grown
- Medium: 9–23 kg (21–50 lb)
- Large: over 23 kg (50 lb)
How to use the calculator
- Pick Labrador, or choose Other and select your dog's adult size.
- Enter your dog's age in years (or switch the unit to months).
- Read the equivalent human age. You can also work backwards: type a human age to see the matching dog age.
The Labrador DNA formula
In 2019, researchers at the University of California, San Diego studied chemical changes in the DNA of 104 Labrador Retrievers and compared them with human ageing patterns. They proposed this formula:
human age = 16 × ln(dog age) + 31
Because it was built from Labrador data, it is most accurate for Labradors. For other breeds, the size-based chart gives a more practical estimate.
Things to keep in mind
Since one dog year can equal several human years, health problems can develop faster than you'd expect. Most vets recommend a check-up at least once a year for adult dogs and twice a year for seniors.
Daily Calorie & Food Portion Estimator
How much should I feed my dog?
This calculator estimates your dog's daily energy needs using the method most vets use. It starts with the Resting Energy Requirement (RER), the calories your dog would burn lying still all day:
RER = 70 × (body weight in kg)^0.75
That number is then multiplied by a factor for life stage and activity to get the total daily calories:
| Type | Multiplier |
|---|---|
| Puppy, 0–4 months | 3.0 × RER |
| Puppy, 4 months to adult | 2.0 × RER |
| Intact adult, average activity | 1.8 × RER |
| Neutered adult, average activity | 1.6 × RER |
| Inactive / obese-prone or senior | 1.4 × RER |
| Weight loss | 1.0 × RER |
| Weight gain | 1.7 × RER |
| Working dog (light / moderate / heavy) | 2.0 / 3.0 / 5.0 × RER |
How to use the calculator
- Choose the type that best describes your dog.
- Enter its body weight in kg or lb.
- Optionally, enter the calorie content from your food's label to see how many grams to feed per day and per meal.
Things to keep in mind
These are starting points, not exact rules. Breed, metabolism, climate and treats all change what your dog needs. Treats should make up no more than about 10% of daily calories. Ask your vet before starting a weight-loss plan.
Dog Breed Ideal Weight & Body Condition Score (BCS) Checker
How to check your dog's ideal weight
Scales alone can't tell you if your dog is a healthy weight, because two dogs of the same breed can have very different frames. That's why vets combine breed weight ranges with a Body Condition Score (BCS), a hands-on check of how much fat your dog carries.
How to score your dog's body condition
- Feel the ribs. Run your hands along your dog's sides. You should feel the ribs easily under a thin layer of fat, like the back of your hand.
- Look from above. There should be a visible waist behind the ribs.
- Look from the side. The belly should tuck up behind the chest.
| Score | What it means |
|---|---|
| 1–3 | Underweight: ribs, spine or hip bones easy to see |
| 4–5 | Ideal: ribs easy to feel, clear waist and tummy tuck |
| 6–7 | Overweight: ribs hard to feel, little or no waist |
| 8–9 | Obese: heavy fat cover, no waist, belly may sag |
How the ideal weight is calculated
Following WSAVA guidelines, each score above 5 means about 10% extra body weight. So a 33 kg dog with a score of 7 has an estimated ideal weight of 33 ÷ 1.2 ≈ 27.5 kg. Without a score, the calculator compares your dog with the typical range for its breed and sex.
Why a healthy weight matters
Studies show that dogs kept lean live up to two years longer and have fewer joint problems, less diabetes and less breathing trouble. Your vet can confirm the score and help plan safe weight loss.
Dog Water Intake Calculator
How much water does a dog need?
A healthy dog needs roughly 50–60 ml of water per kg of body weight every day, or about 1 fluid ounce per pound. A 20 kg dog therefore drinks about 1–1.2 litres a day. The real amount changes with activity, temperature, diet and life stage, and the calculator adjusts for each of these.
| Factor | Effect on water needs |
|---|---|
| Exercise and work | +25% to +50% |
| Hot weather | +30% to +50% |
| Wet or raw food | Up to 40% less from the bowl |
| Puppies | About 15% more per kg |
| Pregnant or nursing | About 60% more, or even higher at peak nursing |
Signs your dog isn't drinking enough
- Dry, sticky gums and thick saliva
- Sunken eyes and low energy
- Skin on the neck that stays tented when gently pinched
- Dark yellow urine or peeing less often
When drinking too much is a warning sign
Drinking more than about 100 ml per kg per day is called polydipsia and can point to diabetes, kidney disease, Cushing's disease or an infection. If your dog suddenly drinks much more than usual, book a vet check.
Puppy Growth & Adult Weight Predictor
How the puppy weight predictor works
Puppies of every breed follow a similar growth curve, but at different speeds. A Chihuahua is almost fully grown at 9 months, while a Great Dane keeps growing for up to two years. The calculator works out how much of its adult weight a puppy of your size group has usually reached at its current age, and uses that to predict the final weight.
| Adult size | Adult weight | Fully grown at |
|---|---|---|
| Toy | under 5 kg | 9–10 months |
| Small | 5–10 kg | 10–12 months |
| Medium | 10–25 kg | 12–15 months |
| Large | 25–45 kg | 15–18 months |
| Giant | over 45 kg | 18–24 months |
Tips for accurate results
- Weigh your puppy on the same scale at the same time of day.
- Use the parents' size if your puppy is a mixed breed.
- Repeat the calculation every few weeks. Estimates get more accurate as your puppy gets older.
Healthy growth matters
Growing too fast is a risk for large and giant breeds, because it can lead to joint problems such as hip dysplasia. Feed a puppy food designed for your dog's adult size, avoid overfeeding, and keep your puppy lean. Your vet can check growth at each vaccination visit.
Frequently asked questions
How do I calculate my dog's age in human years?
Pick your dog's adult size (or Labrador), then enter its age. A dog's first year equals about 15 human years and the second about 9 more; after that each year counts as roughly 4–6 human years, depending on size.
Is 1 dog year really 7 human years?
No. The 7-year rule is a myth. Dogs mature much faster in the first two years and then age more slowly. Large breeds also age faster than small breeds in later life.
How many calories does my dog need per day?
Most vets start with the Resting Energy Requirement: 70 × (body weight in kg)^0.75. That number is multiplied by a factor for life stage and activity, for example 1.6 for a neutered adult with average activity.
How do I know if my dog is overweight?
Use the body condition score: you should feel the ribs easily under a thin layer of fat and see a waist from above. A score of 4–5 out of 9 is ideal; each point above 5 is roughly 10% extra body weight.
How much water should a dog drink per day?
About 50–60 ml per kg of body weight (roughly 1 fl oz per lb). Active dogs, hot weather and nursing mothers need more; dogs on wet food drink less. Regularly drinking over 100 ml per kg a day is worth a vet check.
How can I predict my puppy's adult weight?
Enter your puppy's age, weight and expected adult size. Puppies follow predictable growth curves: small breeds are fully grown at about 10–12 months, while giant breeds keep growing until 18–24 months.
Are these calculators a replacement for a vet?
No. They give reliable estimates based on standard veterinary formulas, but every dog is different. Use the results as a starting point and ask your vet for personal advice.