How this calculator works
The exposure estimate adds caffeine and theobromine as total methylxanthines. The veterinary reference supplies average concentrations for six product groups. Labelled cocoa bars use 15.5 mg/g multiplied by the cocoa fraction, as in Merck's example. The upper published semisweet value is used. Drinks, recipes, coffee and products of unknown formulation require a professional concentration estimate. No feline risk threshold is assigned.
Formula
Total methylxanthines (mg) = grams eaten × methylxanthines (mg/g). Exposure (mg/kg) = total mg / body weight (kg). Reverse modes reconstruct information about an existing exposure, not an allowable amount to eat.
Worked example
A 4 kg cat eating 10 g of milk chocolate at 2.3 mg/g has an estimated total of 23 mg, or 5.75 mg/kg. A 5 kg cat eating 2 g of dry cocoa at 28.5 mg/g has an estimated 57 mg, or 11.4 mg/kg. Both situations require an immediate veterinary call.
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Frequently asked questions
Can I wait if the calculated exposure is small?
No. Call your veterinarian or an animal poison control line now. A low estimate can reflect uncertain ingredients or an underestimated amount, and it does not establish safety.
What if my cat has no symptoms?
Contact veterinary help immediately. Do not wait for symptoms, induce vomiting or try a home treatment without veterinary direction.
Where can I find animal poison control?
Your veterinarian or an emergency clinic can help. ASPCA Animal Poison Control is reachable at 888-426-4435 and Pet Poison Helpline at 855-764-7661 in North America; consultation fees may apply.