🍫 My Cat Ate Chocolate — Exposure Meter
Stay calm, and get the facts in the right order. This meter estimates the theobromine exposure from the type of chocolate, the amount, and your cat's weight — so you know how urgent this is and can give your vet the four facts they'll ask for.
⏰ Read this first
If your cat is already showing signs — vomiting, restlessness, trembling, racing heart, wobbliness — skip the meter and call your vet or a poison line now: ASPCA (888) 426-4435 · Pet Poison Helpline (855) 764-7661. Signs can take hours to appear and theobromine clears slowly — never try to make your cat vomit, and don't give home remedies. When in doubt at any point on this page: make the call. The meter informs; it never clears anyone.
What happened?
Type matters more than anything: gram for gram, cocoa powder carries ~100× the theobromine of white chocolate.
Grams of chocolate itself (a standard square ≈ 8–10 g; check the bar's weight on the wrapper if you have it).
Exposure estimate
⚠️ Unknown amount = plan for the worst plausible
Without an amount, no honest estimate exists — and guessing low is the dangerous direction. Work out the most that could be missing (weigh the bar/packet, count the squares), assume that much, and call your vet or a poison line now with the type, your cat's weight and the time window. They'd rather get a call that ends in "just monitor" than a late one.
That summary is exactly what the vet or poison line will ask: type, amount, weight, time, signs. Having it ready makes the call faster and the advice better.
Signs to watch for (can appear 2–12 hours after eating)
Restlessness or agitation · vomiting · diarrhoea · drinking/urinating more · fast breathing or a racing, pounding heart · muscle tremors · wobbliness. Theobromine clears from a cat's system slowly, so signs can persist — and this list is for recognising, not for treating: any of these = the call, immediately.
Never do these
✗ Don't make your cat vomit. ✗ Don't give milk, oil, salt water, charcoal or any home remedy. ✗ Don't "wait and see" in the moderate band or above — early calls are the ones that end well.
Why this meter exists
It makes the vet call faster, not optional
Every chocolate call starts with the same four questions — what type, how much, how heavy is the cat, how long ago. Owners who can answer them get precise advice in minutes. This meter organises exactly those facts, and its summary button puts them on your clipboard.
Because "a bit of chocolate" can differ 100×
A square of milk chocolate and a square of baking chocolate are not the same event, and a lick of spilled cocoa powder can outweigh a whole white-chocolate bar. Type and grams — not "some chocolate" — decide the urgency, and this is built around that difference.
Cat-specific caution, honestly labelled
Most chocolate calculators online are dog calculators — the dose research is mostly canine. Cats are smaller, clear theobromine more slowly, and are treated by vets as at least as sensitive. These bands are set conservatively for cats, and the page says so, rather than dressing dog numbers up as feline facts.
How the bands are set
| Band | Exposure (mg/kg) | What it means |
|---|---|---|
| 🟢 Trace | under ~5 | Theobromine negligible (typical of white chocolate or crumbs). Watch, note the details, call an advice line if you're at all unsure. |
| 🟢–🟡 Mild | ~5–20 | Stomach upset is the likely worst of it. Watch closely for the sign list; call for advice if any appear — sooner for kittens/seniors. |
| 🟠 Moderate | ~20–40 | The range where reference data expects real signs (GI, then heart). Call your vet or a poison line now — don't wait for signs to grade it for you. |
| 🔴 High | ~40–60 | Heart effects enter the picture in reference data. Vet now — phone ahead while you travel. |
| 🔴 Severe | over ~60 | The range associated with tremors/seizures in reference data. Emergency vet, immediately. |
Theobromine reference values (per gram): white ≈ 0.25 mg · milk ≈ 2.3 mg · dark 50–60% ≈ 5.3 mg · dark 70%+ ≈ 8 mg · baking ≈ 16 mg · cocoa powder ≈ 28 mg. Threshold ranges are extrapolated largely from canine data (Merck Veterinary Manual / poison-line references) and applied conservatively to cats — your vet's judgement outranks this table every time.
Questions people ask
I thought cats can't even taste sweet — why did mine eat chocolate?
True, cats lack the sweet taste receptor — but chocolate also contains fat and cocoa butter aromas, and cats are curious texture-investigators. Curiosity plus an open wrapper is the usual story; it was never about a sweet tooth.
It was chocolate cake / ice cream / a biscuit. Same thing?
Same toxin, much lower concentration — baked goods are mostly flour and sugar, so the theobromine per gram is far below bar chocolate (frosting and filling count for more than sponge). Use this meter with the bar-chocolate it most resembles and you'll overestimate slightly — the safe direction. Meaningful amounts of anything chocolate still earn a call.
White chocolate — so it's fine?
For theobromine, essentially yes — the meter will land in Trace. But white chocolate is fat and sugar, so a stomach upset is still possible, and "fine" is a conclusion for your vet's advice line, not a webpage. Watch them; call if signs appear.
My cat ate it hours ago and seems fine. Am I in the clear?
Not necessarily — signs commonly take 6–12 hours to peak because theobromine absorbs and clears slowly. Use the time selector above honestly, keep watching through the 12-hour window, and let the band (not the current calm) decide whether you call.
What will the vet actually do?
That depends on dose and timing, and it's their call entirely — which is precisely why the guidance here stops at "call". What you CAN do is arrive with the four facts ready (use the summary button) and the wrapper in hand.
Keep exploring
Can Cats Eat…? Checker — chocolate sits at the top of its toxic list, with 104 more foods · Plant Checker — the other household toxin list · Cat Home Safety Audit — kitchen and baking storage included · All KittyButts tools
An awareness and triage aid built on published theobromine reference values — not a diagnosis, not treatment advice, and not a substitute for your vet or a poison line, whose judgement always outranks an estimate. If this page and your gut disagree, obey your gut and call.