Key takeaways
- Add about 4 inches to your dog's length and height for clearance.
- Pick the smallest standard crate that meets the minimum length.
- Standard lengths run 24, 30, 36, 42, and 48 inches (XS–XL).
- For a puppy, buy the adult size and add a divider.
How to size a dog crate
The right crate lets your dog stand up without ducking, turn around, and lie down stretched out — but it shouldn't be so large that it loses its cozy, den-like feel. The standard rule is to measure your dog and add a few inches of clearance, then round up to the nearest stock crate size. Most crates are sold by length in fixed steps, so the calculator picks the smallest one that fits.
That clearance gives room to move without wasting space that would weaken house-training.
Worked example: a 24-inch dog
A dog measuring 24 inches nose to tail base needs a minimum crate length of 24 + 4 = 28 inches. The smallest standard size that meets that is the 30-inch (Small) crate. A 20-inch-tall dog needs at least 24 inches of crate height, which the 30-inch crate comfortably provides.
Standard crate sizes by dog weight
| Crate length | Size | Typical dog weight |
|---|---|---|
| 24 in | XS | Under 25 lb |
| 30 in | S | 26–40 lb |
| 36 in | M | 41–70 lb |
| 42 in | L | 71–90 lb |
| 48 in | XL | 91 lb and up |
What to do with the number
Use the recommended size to shop, then confirm your dog can stand and turn inside. To plan for a growing puppy, pair this with the puppy weight predictor so you buy the adult size once. If you're new to your dog's age and life stage, the dog age calculator helps set expectations for how much space and training a young dog needs.
Frequently asked questions
What size crate does my dog need?
Measure length and height, add ≈ 4 in to each, then buy the smallest standard crate that meets the minimum length. A 24-in dog needs a 30-in (Small) crate.
How do I measure my dog for a crate?
Length = nose to base of tail; height = floor to top of head while sitting. Add 4 in to each so the dog can stand, turn, and lie down.
Should a puppy's crate be bigger?
Buy the adult size and use a divider to shrink the space. Too much room lets a puppy soil one end and sleep in the other, slowing house-training.
What if the crate is too big or too small?
Too small is unsafe; too big hurts the den feel and house-training. Aim for ≈ 4 in of clearance over the dog's length and height.
Is a soft or wire crate better?
Wire is sturdy, well-ventilated, and good for chewers and training; soft crates are lighter for travel but best for calm, crate-trained dogs.
Do I need a special crate for travel?
Yes — airlines require a rigid, IATA-compliant kennel with room to stand and turn. Add extra space and check your airline's exact rules.
Sizing follows standard crate dimensions and the stand-turn-lie clearance rule — see this crate sizing reference from the American Kennel Club for choosing and measuring a crate.
Last reviewed June 2026