Veterinary Drug Dosage Calculator
Search a drug, pick a species, enter a weight — get an evidence-based dose range with the citations behind it. Built for clinicians treating dogs, cats, reptiles, birds, pocket pets, livestock, and equine patients.
Free tier covers 10 calculations a day on dogs and cats. Pro and Student tiers unlock the exotic, livestock, and equine formulary.
Example output
Metronidazole · 12 kg dog · PO180–300 mg
PO every 12 hours
Range: 15–25 mg/kg q12h × 12 kg body weight.
Sign in for the live calculator — convert lbs/g, add a concentration to get mL, surface species-specific warnings (e.g. ivermectin in MDR1 collies, oral β-lactams in rabbits).
How it works
- 1. Search a drug. Type any portion of the generic or brand name. The autocomplete covers 1,000+ entries spanning antimicrobials, analgesics, anti-parasitics, anesthetics, GI drugs, endocrine therapies, and more.
- 2. Pick a species. Only species with curated dose rules for that drug appear, so you can never reach a “no rule found” dead-end. Reptiles, birds, pocket pets, livestock, and equine are all first-class citizens — not afterthoughts to a dog/cat formulary.
- 3. Enter weight. kg, lbs, or grams — the calculator converts. Out-of-range weights against the species' typical band trigger a warning, not silent acceptance.
- 4. (Optional) enter concentration. For injectables and oral suspensions, the calculator returns both a dose range (mg) and a draw-up volume (mL) — the number you actually need at the patient.
- 5. Read with citations. Every result shows the source citation, the evidence level, and any species-specific or breed-specific warnings (e.g. ivermectin in MDR1 collies, oral beta-lactams in rabbits).
What's covered
14 species, 3,813 rules
Dog, cat, rabbit, guinea pig, bearded dragon, ball python, African grey parrot, horse, cattle, sheep, goat, swine, chicken, and turkey. Companion, exotic, equine, and food-animal coverage in one formulary.
Evidence-tiered dosing
Strong / Moderate / Weak / Extrapolated badges so you can tell a published clinical trial from a textbook extrapolation at a glance.
Volume + dose
Add concentration to convert mg → mL automatically. Useful for compounded formulations and small-patient dosing where the math is the actual error surface.
Cited, not invented
Every dose rule links to its primary source: peer-reviewed papers, Carpenter's, Plumb's, BSAVA, etc. We're a re-presenter of published guidance, not an authority of our own.
Related tools
Ready to calculate?
Sign in or create a free account. Free tier covers dog and cat dosing at 10 calculations per day. Pro is for clinics doing exotic, livestock, or equine work where 10/day fills up by lunch.