IATA crate size calculator for dogs and cats
Airlines that follow IATA rules require a crate big enough for your pet to stand, turn around and lie down naturally. IATA sets this out as a simple formula based on four measurements of your pet. Enter them below to see the minimum inner dimensions your crate needs. It's free, and nothing is sent to us unless you choose to continue to a full check. PetFlyCheck is independent and not affiliated with IATA.
Source: IATA Pet Container Requirements
Short-nosed (brachycephalic) breeds such as pug, French or English bulldog, Boston terrier, boxer, Shih Tzu, Pekingese, Persian, Himalayan, Exotic Shorthair. IATA requires a crate 10% larger for these breeds.
IATA allows some animals to travel together in one crate. Width increases with each animal. Check with your airline first, as many accept only one per crate.
Source: IATA Pet Container Requirements
Should I measure the inside or the outside of the crate?
The inside. IATA's formula gives the minimum inner space your pet needs. Outside dimensions include the walls and are always larger.
My crate is a little smaller than the result. Is that a problem?
It can be. The formula gives IATA's minimum, and airlines can refuse a crate that doesn't meet it. If you're close, re-measure your pet standing naturally. If it's still under, a larger crate is the safer choice.
Why does my snub-nosed dog or cat need a bigger crate?
IATA asks for a crate 10% larger for snub-nosed breeds, to give them more room and air during travel.
Is this the size my airline requires?
It's the IATA minimum, which airlines following IATA rules use as a baseline. Some airlines add their own limits, such as maximum crate sizes for certain aircraft. Check with your airline, or choose our Full Audit, which includes airline-specific rules.
Is the size the only thing that matters?
No. IATA also sets rules for fasteners, ventilation on all four sides, the door and latch, bowls, labels, wheels and the floor. Our $39 Crate Check reviews these from three photos.
Check Your Crate Before You Fly
Enter your pet's measurements and upload 3 crate photos. We apply the IATA size formula and check what is visible: bolts, door, ventilation on four sides, bowls. Independent service, not affiliated with IATA or any airline.
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