Free Dog Calculators
Age, Weight, Food, Toxicity & More
From puppy growth to senior health, our collection of 20 free dog calculators covers everything a responsible dog owner needs. Click any card to expand and get instant results — no sign-up required.
Dog Age Calculator
Convert dog years to human years based on breed size.
Click to CalculatePuppy Weight Estimator
Estimate your puppy's adult weight.
Click to CalculatePuppy Growth Calculator
Predict final size based on growth rate.
Click to CalculateDog Calorie Calculator
Daily energy needs based on weight & activity.
Click to CalculateDog Size Calculator
Predict adult weight category (small, medium, large).
Click to CalculateDog Heat Cycle Calculator
Predict next heat & fertile window.
Click to CalculateDog Water Intake Calculator
Daily water needs based on weight & activity.
Click to CalculateDog Chocolate Toxicity Calculator
Check if ingested chocolate is dangerous.
Click to CalculateDog Harness Size Calculator
Find the right harness size.
Click to CalculateDog Food Amount Calculator
Daily dry/wet food amount in cups/grams.
Click to CalculateDog Raisin Toxicity Calculator
Is the amount of raisins dangerous?
Click to CalculateHomemade Dog Food Calculator
Daily amount of homemade meals (grams).
Click to CalculateDog BMI Calculator
Body condition score based on weight & height.
Click to CalculateDog Onion Toxicity Calculator
Is the amount of onion dangerous?
Click to CalculateRaw Dog Food Calculator
Daily raw food amount (BARF/PMR).
Click to CalculatePuppy Feeding Calculator
Meals per day & total amount for growing pups.
Click to CalculateDog Calorie Calculator by Breed
Breed-specific daily calorie needs.
Click to CalculateCost of Owning a Dog Calculator
Annual cost estimate (food, vet, misc.).
Click to CalculateDog Groomer Tip Calculator
Suggested tip based on service cost.
Click to CalculateDog Crate Size Calculator
Find the right crate size based on your dog's measurements.
Click to CalculateWhy Use Our Free Dog Calculators?
Veterinarian‑Approved Formulas
All calculators use established veterinary science and breed‑specific data to give you reliable results.
Mobile‑Friendly & Instant
No downloads or sign‑ups required. Get answers right here, on any device, in seconds.
100% Free & Private
Your data stays on your device. We never store or share any information you enter.
Perfect for Every Dog Owner
From first‑time puppy parents to experienced breeders, these tools make pet care easier.
Frequently Asked Questions About Dog Calculators
Our dog age calculator follows the modern veterinary formula that accounts for breed size. It gives a very close estimate, though genetics and health also play a role. For small breeds, multiply by 4.5; for large breeds, by 6-7 after age two.
Most dogs reach their full adult size between 9‑18 months. Smaller breeds mature faster (9-12 months), while giant breeds may continue growing up to 2 years. Use our puppy growth calculator to predict the final size.
Calorie needs depend on weight, activity, and life stage. A 10 kg moderately active dog needs about 400‑500 kcal/day. Our calorie calculator uses the MER (Maintenance Energy Requirement) formula for precise numbers.
Absolutely. All 20 dog calculators are 100% free — no subscriptions, no hidden fees, and no personal data collection. Use them as often as you need.
The average dog gestation period is 63 days, but can range from 58 to 68 days. Use our dog pregnancy calculator by entering the mating date to get an exact due date.
Decreased appetite, enlarged and darkened nipples, increased clinginess, and slight weight gain around week 3‑4. A vet can confirm via ultrasound at day 25‑30.
Switch to high‑quality puppy food in the last trimester. It provides extra protein and calories. Divide into 3‑4 smaller meals to avoid discomfort. Our dog food amount calculator can help adjust portions.
It depends on the type and amount. Baking chocolate is most dangerous: just 0.5 oz per 10 lbs body weight can cause severe poisoning. Use our chocolate toxicity calculator for a personalized risk assessment.
Chocolate, grapes, raisins, onions, garlic, xylitol (sugar substitute), macadamia nuts, and alcohol are highly toxic. Our onion and raisin toxicity calculators help gauge risk after accidental ingestion.
Generally, 40‑60 ml per kg body weight. Active dogs need more, especially in hot weather. Our water intake calculator gives you an exact daily target based on weight and activity.
Divide current weight by age in weeks, then multiply by 52 (small breeds), 60 (medium), or 78 (large). Our puppy weight estimator does the math for you — just enter current weight and age.
Typically every 6‑8 months, though small breeds may cycle more often. The heat lasts about 2‑3 weeks, with a fertile window around days 9‑14. Use our heat cycle calculator to predict the next cycle.
Measure the chest girth (behind front legs) and match to weight. Small: chest 40‑55 cm, Medium: 55‑70 cm, Large: 70‑85 cm, X‑Large: 85+ cm. Our harness size calculator picks the best size automatically.
About 2‑3% of body weight daily for adult dogs, split into two meals. Our homemade dog food calculator adjusts for activity level. Always consult a vet for balanced nutrition.
Feel the ribs — they should be easily felt with a slight fat covering. If you can't feel ribs, or there's no visible waist, your dog may be overweight. Our dog BMI calculator gives a numerical score.