Cat Chocolate Toxicity Calculator

Your details

Your cat's body weight. An average adult domestic cat weighs about 4-5 kg (8-11 lb).
kg
Choose the type closest to what your cat ate. Darker chocolate and cocoa powder contain far more theobromine per gram.
Estimate the total amount of chocolate your cat consumed. Even a small piece of dark chocolate can be dangerous for a cat.
g
Total methylxanthinesLow risk
4.38mg/kg

Theobromine + caffeine per kg of body weight - the key toxicity figure

Theobromine ingested15.5mg
Caffeine ingested2mg
Theobromine dose3.88mg/kg
Caffeine dose0.5mg/kg
Risk levelLow risk
Estimated lethal amount (for reference)228.6g
4.38 mg/kg
Low risk<20GI symptoms20-40Cardiovascular40-60Neurological60-100Potentially fatal100+

Total dose: 4.38 mg/kg - low risk, but monitor closely.

  • Your cat ingested approximately 15.5 mg of theobromine and 2.0 mg of caffeine, for a total of 17.5 mg of methylxanthines.
  • This dose is below the threshold typically associated with clinical signs. However, individual sensitivity varies and any amount of chocolate is best avoided.
  • Milk chocolate contains about 1.6 mg of theobromine and 0.20 mg of caffeine per gram. Darker chocolate and cocoa powder are far more concentrated.
  • For context, a potentially fatal dose for a 4.0 kg cat would be around 228.6 g of this chocolate type.

Next stepMonitor your cat for the next 6-12 hours for any vomiting, diarrhoea, restlessness, or changes in heart rate. If any signs appear, contact your veterinarian.

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