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Crate Size Calculator
The sizing rules
A crate should be long enough for your dog to stand and turn around, and tall enough to sit without ducking, yet not so roomy that a puppy can sleep at one end and toilet at the other. The classic rule adds 2–4 inches to body length and to shoulder height, then rounds up to the nearest standard model: 24, 30, 36, 42 or 48 inches. For puppies, buy for the adult size and use the included divider panel to shrink the space.
Sizing by weight is a good first pass, but two dogs of the same weight can carry it very differently. Greyhounds are longer than Bulldogs at equal weight, so if your dog sits between sizes or has an unusual build, the measurement mode is the safer choice. When crate training, keep sessions positive and never use the crate for punishment.
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Frequently asked questions
What size crate for a 30 lb dog?
A 30 lb (13.6 kg) dog typically fits a 30-inch crate; longer-bodied breeds may prefer 36 inches.
Should I crate my puppy in an adult-size crate?
Buy the adult size but use the divider panel, confining the puppy to just enough room to lie down — this supports house training.
Is a bigger crate always better?
No. Too much space undermines the den feeling and, for puppies, house training. Match length and height plus 2–4 inches.