How this calculation works
The Pet Medication Dosage Calculator assists pet owners and veterinary technicians in calculating total milligram (mg) doses, liquid milliliter (mL) volumes, and tablet portions based on precise animal body weight and veterinary prescription parameters.
Mathematical formula and logic
Weight in kg = Weight in lbs / 2.20462. Total Dose (mg) = Weight (kg) × Dose Rate (mg/kg). Liquid Volume (mL) = Total Dose (mg) / Concentration (mg/mL). Tablets = Total Dose (mg) / Tablet Strength (mg).
Worked example
For a 35 lb (15.88 kg) dog prescribed 10 mg/kg of an antibiotic: Total single dose is 15.88 × 10 = 158.8 mg. If using a 50 mg/mL liquid solution, administer 3.18 mL. If using 100 mg tablets, give ~1.5 tablets (150 mg).
Calculation assumptions
- Calculations require exact prescribed milligram-per-kilogram dosage instructions from a licensed veterinarian.
- Liquid suspensions must be shaken thoroughly before measuring with an oral dosing syringe.
Frequently asked questions
Why is human medication dangerous for dogs and cats?
Human over-the-counter medications like Tylenol (Acetaminophen), Advil (Ibuprofen), and Aleve (Naproxen) are highly toxic to pets and cause fatal liver failure, kidney destruction, and severe gastric ulcerations even in tiny doses.
How do I accurately convert my pet's weight to kilograms?
Divide your pet's weight in pounds by 2.20462 (e.g. a 22 lb dog weighs exactly 9.98 kg, approx 10 kg).
What should I use to measure liquid pet medicine?
Always use a calibrated oral dosing syringe or pediatric dropper with clear milliliter (mL) markings. Never use household kitchen teaspoons, which vary wildly in volume.
What should I do if I miss a pet medication dose?
Administer the missed dose as soon as you remember unless it is almost time for the next scheduled dose. Never double up doses without specific instructions from your veterinarian.
Can I crush tablets into my pet's food?
Many standard tablets can be crushed or hidden in a pill treat, but enteric-coated, extended-release, or bitter-tasting capsules should never be opened or crushed. Consult your vet or pharmacist.