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Multiply the prescribed dose in mg/kg by the animal's weight in kg to get total milligrams needed per administration.
Total dose (mg) = Dose (mg/kg) × Weight (kg)Divide total mg by drug concentration (mg/mL for liquids, mg per tablet for solids). Round to practical fractions only when your veterinarian approves partial tablets.
Volume (mL) = Total dose (mg) / Concentration (mg/mL)Daily dose (mg/kg/day) differs from per-dose amount. A 10 mg/kg/day prescription given twice daily equals 5 mg/kg per dose. Do not double-count frequency in the weight calculation.
Per-dose mg/kg = Daily mg/kg / Number of doses per dayUpdated: July 2026
Total dose = 10 × 15 = 150 mg. At 50 mg/mL concentration, administer 3.0 mL per dose. Verify dosing interval (e.g., every 12 hours) with your vet.
Total dose = 2 × 4.5 = 9 mg per dose. A 10 mg tablet is close — veterinarian may approve 9/10 tablet or prescribe a different strength. Never split without guidance.
At 4 mg/kg once daily: 4 × 30 = 120 mg total. Use only veterinary-prescribed NSAIDs — human ibuprofen and acetaminophen are toxic to dogs and cats.
Veterinary mg/kg dosing assumes weight in kilograms. A 20 lb dog is 9.1 kg, not 20. Using pounds directly more than doubles the calculated dose.
Never double up without veterinary approval. Overdose risks toxicity, especially with NSAIDs, antiparasitics, and cardiac medications with narrow therapeutic windows.
Veterinary medications are dosed by body weight in mg/kg, but owners administer specific tablet sizes or liquid volumes. This calculator converts prescribed mg/kg doses to practical units using drug concentration. Always confirm with your veterinarian before administering any medication.