Pet Carrier Size Calculator
A carrier that is too small is uncomfortable and stressful for your pet, while one that is too large can be awkward to carry and may not be accepted by vets, groomers or airlines. Enter your pet's weight below to get a recommended carrier size.
Find the right pet carrier size
Enter your pet's weight to get a recommended carrier size.
Recommended carrier size for a 5kg pet:
Small carrier
Approximate dimensions: ~45 x 30 x 30cm. Suits cats and small dogs.
Recommended products
A few well-reviewed pet carriers at a range of sizes.
£65.99
Pros
- Built-in tether clips onto an existing seatbelt
- Raises small dogs to see out the window safely
- Removable washable liner
Cons
- Only suitable for dogs under around 9kg
£80.45
Pros
- Part of the PetSafe Happy Ride booster seat range
- Padded sides and adjustable straps for stability
- Compact size fits most rear seats
Cons
- Only suitable for smaller dogs and puppies
£34.89
Pros
- Fits most footwell and under-seat spaces in cars
- Mesh panels give good airflow and visibility
- Fold-flat design for easy storage
Cons
- Not rigid enough for air travel requirements
Frequently asked questions
How much room does my pet need inside a carrier?
Your pet should be able to stand up, turn around and lie down comfortably inside the carrier, so it is worth sizing up slightly rather than choosing one that only just fits their current dimensions.
Can I use a cat carrier for a small dog, or vice versa?
Yes, carrier sizing is generally based on weight and dimensions rather than species, so a small carrier suited to a cat will often work equally well for a small dog of similar size.
Why isn't a soft carrier suitable for a large dog?
Soft and hard carriers are designed to be hand-carried, so once a dog gets much above around 20kg they become impractical and potentially unsafe to lift and carry, which is why a crate or vehicle restraint is the better option.
Do carriers need to be airline approved for travel?
If you are flying with your pet, check your airline's specific carrier requirements in advance, since many airlines have their own size and construction rules that go beyond general carrier sizing guidance.
How this calculator works
The calculator uses a standard formula relating pet weight to approximate internal carrier volume. We assume a rectangular carrier shape for simplicity, as most pet carriers are roughly rectangular in design. The calculation is based on an estimated minimum volume per kilogram of your pet’s weight – currently 0.015 cubic meters (m³) per kg. This figure takes into account the space needed for your pet to move around comfortably and prevent them from being cramped.
Carrier Dimensions & UK Pet Sizes
- Small Dogs (e.g., Chihuahua, Yorkshire Terrier): Typically weigh between 1 – 5 kg. A carrier volume of 0.015 m³/kg suggests a usable internal space of around 0.15 - 0.75m³. Consider carriers up to 45cm x 30cm x 30cm.
- Medium Dogs (e.g., Beagle, Cocker Spaniel): Generally weigh between 8 – 18 kg. You’ll need a carrier volume of around 0.12 - 0.3 m³. Carrier dimensions could be approximately 56cm x 40cm x 40cm.
- Large Dogs (e.g., Labrador, Border Collie): Usually weigh between 25 – 45 kg. A suitable carrier volume would be around 0.375 - 0.675m³. Carrier sizes might range from 76cm x 51cm x 51cm.
- Giant Breed Dogs (e.g., Irish Wolfhound, Great Dane): Often weigh over 45 kg. Expect a minimum internal volume of 0.675m³ or greater. Larger carriers may measure 91cm x 64cm x 64cm or more.
Worked example: Calculating for Buster the Beagle
Let’s say you have a Beagle named Buster who weighs 18 kg. Using our calculator, we multiply Buster’s weight by the volume factor of 0.015 m³/kg: 18 kg * 0.015 m³/kg = 0.27m³. This indicates that Buster needs approximately 0.27 cubic meters of internal space within his carrier. Considering a typical rectangular carrier, you’d be looking for something with dimensions roughly 56cm x 40cm x 40cm to comfortably accommodate him – this particular size is available on Amazon UK for around £69.99.
More questions answered
What does the calculated volume actually represent?
The calculator provides an estimated internal volume in cubic meters (m³). This represents the space your pet needs to comfortably stand, turn around, and move within the carrier. It’s not a precise measurement but a helpful guide based on average pet movement requirements.
My pet is slightly over the weight range – what should I do?
If your pet falls slightly outside the calculated range, it's generally better to opt for the next size up. It’s crucial that they have sufficient room to move comfortably, and a slightly larger carrier will provide more breathing space. Always prioritise comfort and avoid squeezing.
Does this calculator account for breed-specific needs?
The calculation uses a general volume factor. Certain breeds, particularly those with longer legs or more muscular builds, may require slightly more space. Consider your pet’s individual body shape when choosing a carrier.
What if I’m buying a carrier with rounded corners?
The calculator assumes a rectangular carrier for simplicity. Rounded corners will reduce the usable internal volume slightly. Choose a carrier that provides adequate space even with its design.
Can I use this calculator to choose a carrier for a puppy?
Yes, you can! However, puppies grow quickly. Consider purchasing a slightly larger carrier initially, allowing room for growth, and researching carriers that are expandable or adjustable to accommodate your pet’s development.
What if my pet is very active in the carrier?
If your pet tends to be particularly active within their carrier, opting for a slightly larger size will provide extra space for movement. This is especially important for breeds known for higher energy levels.
Are there any factors I should consider beyond weight?
Yes! Your pet’s temperament and anxiety levels are crucial. A nervous or anxious pet may benefit from a more spacious carrier to reduce stress. Also, the type of travel – short car journeys versus long flights – can influence the necessary space.
How accurate is this calculator?
The calculation provides an approximation based on standard assumptions. Individual pets vary in their movement patterns and needs. Always prioritize your pet’s comfort and observe their behaviour within the carrier before travel.
What if I need a carrier for two small pets?
This calculator is designed for single pets. For two small animals, you'll require significantly more space – approximately double the calculated volume. Consider carriers specifically designed for multiple animals.
Where can I find the Amazon UK products linked from this calculator?
The calculator provides direct links to a selection of compatible pet carriers available on Amazon UK. You can find these by clicking on the recommended carrier dimensions or similar models within each section.