Airline Crate Size Checker
Check whether a crate meets IATA live animal requirements before you fly, using your dog's four standard measurements.
Crate meets IATA minimums
75 cm × 50 cm × 55 cm length × width × height
- Length = A + half of B
- 75 cm
- Width = C × 2
- 50 cm
- Height = D
- 55 cm
Other IATA requirements
- Rigid plastic or wood construction. Wire crates are not accepted in the hold.
- Ventilation on at least three sides for international travel.
- A solid, leak-proof floor with absorbent bedding. No wheels, or wheels removed.
- Door with a secure central locking system, metal rather than plastic.
- Food and water containers accessible from outside, fixed to the door.
- "Live Animals" labels and directional arrows on the outside.
- Confirm with the airline: many apply stricter rules than IATA, and most refuse snub-nosed breeds.
How this is calculated
IATA container requirement 1 defines the minimum internal dimensions from four measurements of the dog. The principle behind them is that the animal must be able to stand, turn and lie down in a natural position for the whole journey.
A = nose tip to base of tail
B = ground to elbow joint
C = width at the widest point
D = ground to top of head or ear tips, standing
length = A + (B ÷ 2)
width = C × 2
height = D Worked example
A dog measuring A = 60 cm, B = 30 cm, C = 25 cm and D = 55 cm needs a crate at least 75 cm long, 50 cm wide and 55 cm high on the inside.
How to measure
- Measure the dog standing square on a level floor, not sitting or lying.
- For D, use the tip of the ears if they stand upright, and the top of the skull if they fold.
- Measure the crate internally, not externally. Wall thickness matters at these margins.
- Round up. A crate that is exactly at minimum will be refused if the check is strict.
Sources
- IATA. Live Animals Regulations, including Container Requirement 1 for dogs and cats.
- Airlines add their own rules on top of the IATA container requirement, and they differ. Check the airline's live animal page before buying a crate.
Plan further ahead than you think
Beyond the crate, international travel needs a microchip, rabies vaccination with the correct waiting period, and often a titre test and health certificate issued within a narrow window before departure. Some destinations require months of preparation, and getting the order wrong means starting again.
Buy the crate early and let your dog live with it at home: feed meals in it, leave the door open, build up to closed-door naps. A dog meeting its travel crate for the first time at the airport is a dog having the worst day of its life.
Snub-nosed breeds
Many airlines refuse brachycephalic breeds in the hold entirely, and those that accept them often require a larger crate than the formula gives. The reason is real: flat-faced dogs cope badly with heat and stress, and they are heavily over-represented in transit deaths. If you have a pug, bulldog or similar, confirm the policy before booking anything.
Common questions
What size crate does an airline require for a dog?
IATA container requirement 1 sets the minimum: length = A + half of B, width = C × 2, height = D. A is nose to tail base, B is ground to elbow, C is the width at the widest point, and D is ground to the top of the head or ears when standing.
What are the IATA measurements A, B, C and D?
A is body length from nose tip to the base of the tail. B is the height from the ground to the elbow joint. C is the width across the widest point, usually the shoulders. D is the full standing height to the top of the head, or the ear tips if the ears stand upright.
Can I use a wire crate to fly my dog?
No. Hold travel requires rigid plastic or wooden construction with a metal door. Wire crates and fabric carriers are not accepted.
Do airlines follow IATA rules exactly?
IATA is the floor, not the ceiling. Many carriers add their own requirements on ventilation, door type, banding, maximum crate dimensions and total weight. Some refuse snub-nosed breeds altogether. Always confirm directly with the airline before buying anything.
What else does the crate need?
Ventilation on at least three sides for international travel, a leak-proof floor with absorbent bedding, no wheels or wheels removed, a secure central-locking metal door, food and water bowls fixed to the door and fillable from outside, and Live Animals labels with directional arrows.
Should I sedate my dog for a flight?
No. Sedation is strongly advised against by IATA and most veterinary bodies, because it impairs temperature regulation and balance at altitude and has been linked to deaths in transit. Acclimatising the dog to the crate over weeks is the real preparation.