Inputs used
- Dog length, nose to base of tail (in)
- Sitting height, floor to top of head/ears (in)
- Shoulder width (in)
- Dog size
dog crate size calculator
How the Dog Crate Size Calculator works
Assumptions, formula, inputs, and practical limits for the Dog Crate Size Calculator.
How this estimate works
Measure your dog, add a practical comfort allowance, then round the crate length up to a common retail size. The calculator keeps width generous enough for turning around rather than using length alone, and it treats the standard retail size as a shopping shortlist rather than a guarantee of internal space.
- Small dogs use about 2 in of allowance; medium dogs use about 3 in; large dogs use about 4 in.
- Recommended width is the larger of twice shoulder width or 55% of recommended length.
- The standard crate length is rounded up to the next common crate size.
Outputs generated
- recommended internal dimensions
- standard crate size
- fit checklist
Worked example
A medium dog measuring 28 in long, 26 in sitting height, and 9 in wide needs about 31 x 18 x 29 in internally, so a 36 in crate is the safer standard size to compare.
Common crate sizing examples
Use these as examples only. The calculator result should be based on your dog's actual length, sitting height, and shoulder width.
| Dog measurement | Allowance used | What to compare |
|---|---|---|
| 11 in long, small dog | Add about 2 in | Start around an 18-22 in crate and check width. |
| 20 in long, medium dog | Add about 3 in | Compare 30 in crates and confirm sitting height. |
| 22 in long, small dog | Add about 2 in | Start around a 24 in internal-length crate. |
| 28 in long, medium dog | Add about 3 in | Compare 36 in standard crates and check internal dimensions. |
| 34 in long, large dog | Add about 4 in | Compare 42 in crates if internal height and width also fit. |
| 38 in long, extra-large dog | Add about 4 in | Compare 48 in crates and inspect door height. |
Before you buy
- Measure from nose to base of tail, not to the tail tip.
- Measure sitting height to the top of the head or ears, whichever is higher.
- Compare internal crate dimensions, not only the product name.
- Use a divider for puppies when the adult-size crate is much larger than they need today.
- Check whether bedding or a crate pad reduces usable height.
- Confirm door size if the dog is tall, elderly, or reluctant to duck into a crate.
- Recheck fit after growth, weight change, injury, or a change in bedding.
- For travel, confirm airline, vehicle, or carrier rules separately.
When this estimate may be wrong
- Airline travel crates can have different requirements from home crates.
- Very broad-chested or long-backed dogs may need extra width or length.
- Dogs recovering from injury or with mobility issues may need advice beyond a simple size estimate.
- Retail crate names often use outside length, not internal usable length.
- Breed examples are only starting points; individual dogs vary within a breed.
- A crate that fits at home may not satisfy airline or transport rules.
Limits of the estimate
This is a sizing guide, not airline, travel, or veterinary advice.
After choosing a likely size, check the internal dimensions from the specific manufacturer. External crate dimensions can be several inches larger than the usable internal space, and bedding, trays, sloped sides, or rounded corners can reduce the room your dog actually has.