Our elegant feline companions come in all sorts of shapes and sizes. Whether you’re shopping for a harness or carrier, need their height or length, or want to dress them in something stylish, knowing how to properly measure a cat matters for getting a good fit without causing them stress or discomfort.
Measuring a Cat’s Height
There are two common ways to measure a cat’s height. Some measure from the shoulder, while others measure from the top of the head down to the floor. Shoulder height tends to be the easier and more reliable method of the two.
The easiest way to get a shoulder height measurement is to support your cat gently under the chest with just enough lift to keep them from squirming. You want to hold them securely enough to get an accurate reading, without lifting them so high that it throws off the true measurement.
Measuring a Cat’s Length
Measuring a cat’s length sounds straightforward, but it can actually be trickier than expected. Cats are naturally flexible and tend to arch their backs, which makes getting an accurate nose-to-tail measurement more challenging than it seems.
Once your cat has settled down, grab a measuring tape or ruler and lay them out on a flat surface like a table or the floor. Keep their head and tail aligned in a straight line and gently stretch their body out.
Start measuring from the neck and work your way down to where the tail begins. Keep the tape or ruler running in a straight line rather than curving around your cat’s body, and jot down the measurement carefully.
Keep in mind that cat sizes vary quite a bit, so length measurements can differ substantially. Most domestic cats fall somewhere between 18 and 20 inches from nose to tail. That said, particularly large cats, or breeds known for unusual body shapes, such as the Sphynx or Scottish Fold, may fall outside that typical range. In those cases, checking with your veterinarian for more precise guidance is a good idea.
Measuring a Cat for a Harness
A harness is essential gear for any cat, whether you’re taking them on outdoor adventures or just a short walk around the block. A properly fitted harness keeps your cat comfortable and reduces the risk of them slipping free. Here’s a step-by-step approach to getting the right measurements:
1. Measure your cat’s neck
Start with the circumference of your cat’s neck. Once your cat is relaxed, gently wrap a flexible tailor’s measuring tape around their neck. Give them some reassurance and attention first before wrapping it around. Position the tape at the base of the neck, roughly where a collar would sit. It should be snug enough that only two fingers fit underneath — not three. Record the measurement.
If you don’t have a tailor’s tape on hand, a piece of string paired with a regular ruler or rigid tape measure works just as well. Wrap the string around your cat’s neck the same way, and once it’s positioned correctly and snug, mark the spot where the free end meets the rest of the string using a marker or your thumbnail. Remove the string and measure the marked length against a ruler or tape measure. Write that number down as well.
2. Measure around your cat’s chest
Next, repeat the process around your cat’s chest instead. This part is a bit trickier, since exactly where you measure affects how well the harness ends up fitting. It helps enormously if your cat will stand still — enlist a friend or family member to hold them steady or distract them with treats while you take the measurement.
Wrap your string or tailor’s tape around your cat again, this time positioning it in the space between the front and back legs. Measure around the chest about 1 to 2 inches behind the front legs, where the chest is typically widest. If you’re uncertain of the exact spot, check whether the harness you’re considering includes a photo showing where the band sits on a cat. Pull the tape or string snug enough that two fingers still fit underneath, and record your result.
3. Compare against the size chart
With both measurements in hand, compare them to the size range listed for the harness you’re considering. Most harnesses are adjustable and cover a range of sizes, so it’s usually safest to aim for the middle of that range.
Types of Cat Harnesses
There are several harness styles worth knowing about. For simple walks, a basic strap-style harness with a D-ring for the leash (often called an H-harness) usually does the job well, though softer vest-style options are available too.
There are also full-coverage “jacket” style harnesses that wrap around more of the cat’s body, which work well for wriggly cats that tend to slip out of standard harnesses — though some cats find these more restrictive and less comfortable.
Measuring a Cat for a Carrier
Once you’ve got your cat’s height and length measurements, multiply each by 1.5. Those two resulting numbers represent the smallest carrier size you should consider buying.
That sizing works well for short trips, like a visit to the vet or groomer, and is generally sufficient for brief car rides. For longer journeys, though — extended car trips, flights, or train travel — it’s worth sizing up beyond that 1.5 multiplier. The extra room allows space for food and water dishes and a small litter box, plus gives your cat more room to stretch out, which helps keep them calmer during the trip.
Choosing Clothing for Cats
How you measure a cat for clothing depends on the specific item. Some outfits require both height and length measurements, while others only need one.
Many cat outfits include a headpiece that fits over the head and fastens beneath the chin or around the neck. In those cases, make sure you have an accurate neck measurement, or confirm the headpiece is fully adjustable for a comfortable fit.
Since plenty of cats dislike having anything on their head, especially anything covering their ears, avoid fastening a headpiece too tightly. It should stay snug enough to remain in place, while still being loose enough for your cat to shake off if they really don’t want to wear it.
