Pet Medication Dosage Calculators
Free, accurate calculators to help you determine the right medication dosage for your furry friends
Browse CalculatorsFeatured Calculators
Choose from our collection of dosage calculators based on published veterinary guidelines
Apoquel Dosage Calculator
Allergies & Itching
Calculate the correct Apoquel (oclacitinib) dosage for your dog based on weight. For allergic dermatitis and atopic dermatitis.
Dog Benadryl Calculator
Allergies & Anxiety
Find the safe Benadryl (diphenhydramine) dosage for your dog. Helps with allergies, motion sickness, and mild anxiety.
Fenbendazole Calculator
Deworming
Calculate Fenbendazole dosage for dogs and cats. Effective against roundworms, hookworms, whipworms, and some tapeworms.
Why Pet Medication Dosing Safety Matters
Giving a pet the wrong amount of medication is one of the most common and most preventable causes of at-home veterinary emergencies. Unlike humans, dogs and cats cannot tell you when something feels wrong, and by the time symptoms appear, an overdose may already be doing damage.
Why Weight-Based Dosing Matters
Most medications are dosed by milligrams per kilogram (or pound) of body weight, not by a flat amount. A dose that is safe for a 30kg Labrador can be dangerously high for a 4kg Chihuahua or a cat. Weighing your pet accurately, ideally on a vet clinic scale, is the single most important step before calculating any dose.
Why Species Matters as Much as Weight
Dogs and cats metabolize many drugs differently. Cats in particular lack certain liver enzymes (like glucuronyl transferase) that dogs and humans use to break down common drugs, which is why medications considered routine for dogs, such as some NSAIDs, can be toxic to cats even at low doses. A calculator built for one species should never be assumed to apply to another.
Why Drug-Specific Calculation Matters
Each medication has its own therapeutic range, the gap between an effective dose and a dangerous one. Some drugs, like fenbendazole, have a wide safety margin. Others, like many pain and allergy medications, have a much narrower one. Using a generic 'pet dose calculator' that doesn't account for the specific drug's pharmacology can produce a number that looks precise but is not actually safe.
When to Use a Calculator vs. When to Call Your Vet
These calculators are designed to help you understand typical dosing ranges from published veterinary guidelines, not to replace a diagnosis. Call your veterinarian before giving any medication if your pet is a puppy, kitten, senior, pregnant or nursing, has kidney, liver, or heart disease, is already taking other medications, or if you are unsure of your pet's exact weight. If your pet has already been given too much of a medication, do not wait, contact your vet or a pet poison control hotline immediately.
Why Choose Our Calculators?
Guideline-Based Dosing
Dosages based on published veterinary dosing literature, always confirm with your vet
Always Free
No subscriptions, no hidden fees. Free forever.
16 Languages
Available in 16 languages for pet owners worldwide
Instant Results
Get accurate dosage calculations in seconds
Important Medical Disclaimer
These calculators are for informational purposes only and should not replace professional veterinary advice. Always consult your veterinarian before giving any medication to your pet.
When in doubt, consult your veterinarian
Real Sources, Not Guesswork
The general dosing ranges and safety information referenced by our calculators are based on published veterinary literature and the resources below. We link directly to them so you can verify anything yourself.
24/7 emergency hotline for suspected pet poisoning or medication overdose.
24/7 licensed veterinary poison control contact center.
Veterinary reference resource covering dosing, drug classes, and species-specific care.
Guidance on household medication hazards and pet poisoning prevention.
Frequently Asked Questions
Our calculators apply published veterinary dosing ranges (mg per kg or lb of body weight) to the weight you enter. The math is accurate, but 'accurate' dosing also depends on factors a calculator cannot see, such as your pet's exact health status, other medications, and breed sensitivities. Treat the result as a reference starting point to discuss with your veterinarian, not a final prescription.