Is this calculator a substitute for veterinary advice?

No. It is a reference estimate using published per-kilogram dose ranges. Real prescribing depends on the diagnosis, the exact product, kidney and liver function, and other medications. Always confirm the dose, form, and frequency with your veterinarian.

How is the dose calculated?

Most pet medications are dosed per kilogram of body weight. The tool multiplies your pet's weight in kilograms by the published low and high milligrams-per-kilogram figures to give a dose range, then divides by the product concentration to estimate the volume.

Why is meloxicam dog-only here?

Meloxicam can be given to cats only as a single one-time injection in many regions; repeated oral dosing in cats risks kidney injury and death. To avoid harm the calculator restricts meloxicam to dogs. Never give a dog NSAID to a cat without explicit vet direction.

What does mg/kg mean?

It means milligrams of drug per kilogram of body weight. A 10 kg dog at 15 mg/kg needs 150 mg per dose. This per-weight scaling is how almost all animal and many human medicines are dosed.

What if my product has a different concentration?

The milligram dose stays the same; only the volume changes. Divide the milligram dose by your product's mg-per-mL figure printed on the label to get the correct millilitres to give.

Pet Medication Weight-Based Dosing Calculator

Estimate a starting dose, then confirm with your vet

Most medicines for dogs and cats are dosed by body weight, so a heavier animal needs proportionally more. This tool multiplies your pet’s weight by the published per-kilogram dose range for several commonly prescribed drugs and converts that to a liquid volume. It is a reference and sanity-check, not a prescription.

How it works

The calculation has two steps:

dose (mg) = weight (kg) × dose (mg per kg)
volume (mL) = dose (mg) ÷ concentration (mg per mL)

Weight entered in pounds is first converted to kilograms by multiplying by 0.453592. The tool stores a low and a high milligrams-per-kilogram figure for each drug, so it reports a range rather than a single number, reflecting how vets titrate within a safe window. The volume assumes one common liquid or suspension concentration; if your product differs, recompute the volume from the milligram dose and your label’s strength.

Important safety notes

The list intentionally limits some drugs by species. Meloxicam and other NSAIDs appear for dogs only because repeated dosing in cats is dangerous. Doses shown are general references and do not account for the specific condition being treated, organ function, or drug interactions. Underdosing antibiotics breeds resistance and overdosing many drugs causes toxicity, so the exact regimen must come from your veterinarian.

Example

A 12 kg dog prescribed amoxicillin at 10 to 20 mg/kg needs 120 to 240 mg per dose every 12 hours. With a 50 mg/mL suspension that is 2.4 to 4.8 mL per dose.