Free Dog Calculators
& Health Tools
From dog age in human years to daily calorie needs, ideal weight, pregnancy due dates and medication dosages — all 45+ free dog calculators in one place. Vet-informed. No sign-up. No ads.
Most Popular Dog Calculators
Start with the tools 12,000+ dog owners use most — quick, accurate, and always free.
Dog Age Calculator
Convert your dog’s age to human years using breed size and the latest DNA research.
Dog Food Calculator
Find the exact daily feeding amount for your dog based on weight, age, and food type.
Dog Calorie Calculator
Calculate your dog’s RER and MER — resting and maintenance energy requirements.
All Dog Calculators & Tools
Every free dog calculator organized by category. Tap any card to get started instantly.
Age & Life Stage
3 toolsHealth & Weight
6 toolsDog BMI Calculator
Is your dog overweight? Check BMI by breed
Try it →Ideal Weight
Target weight range for your dog’s breed
Try it →Puppy Weight
Predict your puppy’s full adult weight
Try it →Body Condition Score
Vet-standard 9-point body condition assessment
Try it →Weight Loss Plan
Safe calorie-deficit plan for overweight dogs
Try it →Dog Growth Chart
Compare growth to breed averages week by week
Try it →Nutrition & Feeding
5 toolsDog Food Calculator
Daily feeding amount by weight, age & food type
Try it →Dog Calorie Calculator
Resting & maintenance energy requirements (RER/MER)
Try it →Water Intake
How much water should your dog drink daily?
Try it →Raw Food (BARF)
Calculate raw diet portions using the BARF model
Try it →Dog Treat Calculator
Safe daily treat allowance by weight & calories
Try it →Breeding & Reproduction
4 toolsMedical & Dosage
6 toolsMedication Dosage
Dog medication dosage by weight (verify with vet)
Try it →Deworming Calculator
Dewormer dosage and schedule by dog weight
Try it →Chocolate Toxicity
Is chocolate dangerous? Check the toxic dose by your dog’s weight
Try it →Benadryl for Dogs
Safe Benadryl dose for dogs by weight
Try it →Xylitol Toxicity
Check whether a xylitol amount is toxic for your dog
Try it →Vaccine Schedule
Core and non-core vaccination timeline by age
Try it →Activity & Exercise
3 toolsWhy Pet Calculator Hub?
Trusted by 12,000+ dog owners for accurate, vet-informed calculations.
Vet-Informed Formulas
Every calculation uses evidence-based formulas reviewed by licensed veterinarians and updated with new research.
No Account Required
Zero sign-ups, no email collection, no paywalls. Every tool is 100% free, forever, for every dog owner.
340+ Breed Data
Breed-specific data for over 340 dog breeds gives far more accurate results than generic one-size-fits-all tools.
Works on Any Device
Fully optimized for mobile, tablet, and desktop. Get answers about your dog anytime, anywhere, instantly.
Frequently Asked Questions
Common questions about dog calculators and using our free tools.
Our dog age calculator uses the 2019 PNAS logarithmic conversion formula based on DNA methylation research — far more accurate than the old “multiply by 7” rule. It also adjusts for breed size since large breeds age faster than small ones. Results are estimates; your vet knows your individual dog’s health best.
Daily feeding depends on your dog’s weight, age, activity level, and the caloric density of their food. Use our Dog Food Calculator for a personalized amount. As a general rule, most adult dogs eat 2–3% of their body weight in dry kibble daily, but always confirm with your specific food’s feeding guide.
RER (Resting Energy Requirement) is the calories a dog needs just to survive at rest — calculated as 70 × (body weight in kg)^0.75. MER (Maintenance Energy Requirement) is RER multiplied by a life-stage factor (1.6 for active adults, 1.0 for sedentary dogs). Use our Dog Calorie Calculator to compute both instantly.
For small/medium breeds: Adult weight ≈ (Current weight ÷ Age in weeks) × 52. For large breeds: Adult weight ≈ Weight at 16 weeks × 2. Our Puppy Weight Calculator handles all breed sizes and returns a predicted adult weight range with breed-adjusted accuracy.
Dog gestation is approximately 63 days (9 weeks) from ovulation, or 65 days from the date of mating. The normal range is 57–72 days. Smaller breeds tend toward the shorter end. Use our Dog Pregnancy Calculator to find your whelping date and track trimester milestones.
No — our calculators provide informational estimates only. They’re ideal for general guidance, tracking trends, and preparing for vet visits, but never replace a licensed veterinarian’s examination and professional advice. Always consult your vet for medical decisions, medication dosages, and any health concerns about your dog.