Cat Grape and Raisin Toxicity Calculator: Is My Cat at Risk?

Did your cat eat grapes or raisins? Check the risk.

Any amount of grapes or raisins is treated as an emergency for cats because there is no established safe or toxic dose for cats. Enter your cat's weight and the amount eaten to get a dose estimate to share with your vet or poison control. The evidence in cats is limited, and this calculator never shows a safe result.

Last reviewed October 29, 2026 by PetPoisonCalc against the sources listed below.

There is no known safe amount of grapes or raisins for cats.

Grape and raisin kidney injury is well documented in dogs, but there are very few reports in cats: Merck Veterinary Manual mentions only anecdotal reports of kidney failure in cats, two cats with acute kidney failure were reported to the UK Veterinary Poisons Information Service, and even ASPCA sources disagree about cats. Because no safe or toxic dose has been established for cats, every result here is Emergency: contact a veterinarian or animal poison control now.

Assess the situation

Fill in what you know. Estimates are fine. Count the fruit that is missing if you can.

Cat’s weight

lbs

If you're unsure, use your cat's last vet-recorded weight.

Enter a weight greater than 0.

What did your cat eat?

Raisins and currants are dried and concentrated, roughly 4 to 5 times more toxic per gram than fresh grapes.

How many did your cat eat?

Approximate is okay. If a bunch or box is open and you are unsure, use the highest reasonable estimate, not the lowest.

Enter an amount greater than 0.

Total weight consumed (grams)

A kitchen scale reading overrides the count estimate above.

Assessing

- Estimated dose (grams of fruit per kg body weight)

- Grapes or raisins per kg body weight

This is an estimate, not a diagnosis, and it can be wrong. Whatever the result, call your veterinarian or a poison control line now: ASPCA Animal Poison Control (888) 426-4435 or Pet Poison Helpline (855) 764-7661 (fees may apply). Read the medical disclaimer.

Emergency vet or poison control: which do I call?

Because no safe or toxic dose has been established for cats, any amount is treated as an emergency. Calling early gives your vet the most options, such as inducing vomiting at the clinic when it is appropriate and checking kidney values.

Go straight to an emergency vet if…

Your cat is vomiting, will not eat, is very lethargic, or is drinking or urinating much more or much less
Your cat ate any amount of grapes, raisins, currants, or sultanas and your vet or poison control advises going in
Your cat has kidney disease or other health problems
You cannot tell how much was eaten

Call poison control first if…

Your cat ate a small amount and seems normal
You want to know whether your cat should be made to vomit at the clinic
You want a case number and treatment plan to hand to your vet

Never try to make a cat vomit at home. Hydrogen peroxide and salt are not safe for cats. Vets use specific medicines to induce vomiting in cats.

What to watch for after a cat eats grapes or raisins

Very few cat cases have been published, so this timeline combines the signs seen in reported cats with the better-documented course in dogs.

First 24 hours

Early signs

Vomiting (sometimes with pieces of fruit)
Lethargy
Diarrhea or loss of appetite

24 to 72 hours

Possible kidney injury (documented in dogs, reported in two cats)

Drinking and urinating more, or much less
Weakness, dehydration
Abdominal discomfort

Days 3 and later

Kidney failure if it develops

Little or no urine
Bad breath, mouth ulcers
Collapse

Early signs are those reported in the dogs and cats in the Dutch poison center study (2022). Kidney injury timing is from dog data (Merck Veterinary Manual).

Published data behind these estimates

These are the main published data. Most of it is from dogs; the cat data is small and cannot set a safe or toxic dose. That is why this calculator treats any amount as an emergency instead of using dose cutoffs.

Finding	Source and details
ASPCA: sources disagree	One ASPCA article says cats may also be affected; an ASPCA blog post says grapes and raisins are toxic to dogs but not to cats.
Cats: anecdotal only	Merck Veterinary Manual: anecdotal reports exist of kidney failure in cats and ferrets after eating grapes or raisins, but there are no published case reports.
Cats: 2 cases of kidney failure	UK Veterinary Poisons Information Service cases of acute renal failure in cats, as summarized in the 2022 Dutch study.
Cats: 13 cases, 2 with signs	Dutch poison center study (2022): of 13 cats, 2 developed clinical signs and none developed acute kidney injury. The authors wrote that whether cats develop kidney injury is still not clear.
Dogs only: 9 g/kg grapes, 2.8 g/kg raisins	Lowest doses linked to kidney injury in dog case data. Shown for context only; these dog numbers are not used for cats.

Any amount of grapes or raisins is treated as an emergency for cats because there is no established safe or toxic dose for cats. Every result on this calculator is Emergency: act now. There is no Urgent tier, no lower tier, and no "safe" result. The dose shown (grams of fruit per kg, using average weights of 5 g per grape and 1 g per raisin) is only an estimate to share with your vet or poison control. It does not change the result.

Common questions

Are grapes and raisins toxic to cats?

Possibly. Grape and raisin kidney injury is well documented in dogs. In cats the evidence is limited: Merck Veterinary Manual mentions anecdotal reports of kidney failure in cats with no published case reports, the UK Veterinary Poisons Information Service has described two cats with acute kidney failure, and ASPCA sources disagree (one article says cats may also be affected, a blog post says grapes are toxic to dogs but not to cats). Because the risk cannot be ruled out, treat any ingestion seriously and call a vet or poison control.

How many grapes can a cat eat safely?

There is no known safe amount for cats. No toxic dose has been established, and in dogs some individuals have reacted to very small amounts. This calculator treats any amount as an emergency.

My cat ate one grape. What should I do?

Treat it as an emergency. Call your vet or ASPCA Animal Poison Control at (888) 426-4435 now. There is no established safe or toxic dose for cats, so even one grape or raisin cannot be called safe. Your vet may advise inducing vomiting at the clinic or monitoring kidney values.

What are the symptoms of grape poisoning in cats?

In the 2022 Dutch poison center study, signs reported in dogs and cats included vomiting, lethargy, diarrhea, and loss of appetite. In dogs, the main danger is acute kidney injury, which can show up as vomiting, reduced appetite, weakness, and drinking or urinating more or much less, usually within 24 to 72 hours.

Why do so few cats get grape poisoning?

Most cats are not interested in grapes or raisins, so exposures are rare and there is little data. A rare exposure is not proof of safety. The Dutch study found most cats had no signs, but 2 of 13 did, and the UK cases involved kidney failure.

Sources

Reviewed against the sources below on October 29, 2026 by PetPoisonCalc.