Dog Crate Size Calculator

A dog crate size calculator turns two measurements into a crate size: your dog’s nose-to-tail-base length and standing head height, each plus a 2–4 inch allowance. The recommended size is the smallest nominal crate (24, 30, 36, 42 or 48 in) at least as long as that required length.

1. Choose inches or centimeters. If you switch later, the values you typed are converted, not cleared; the boxes show the converted value to two decimals, but the calculation keeps using your original, unrounded measurement until you edit it.
2. With your dog standing, measure from the tip of the nose to the base of the tail. Do not include the tail itself.
3. Still standing, measure from the top of the head to the floor. This is the MidWest method; Petmate measures height with the dog sitting, which gives a different number, so use the standing figure here.
4. Leave the allowance at 3 in or adjust it between 2 and 4 in.
5. Optionally add your dog’s weight in pounds or kilograms as a cross-check, and say whether your dog is a puppy.
6. Press Calculate crate size. You get the recommended nominal size, the next size up, the required length and height, and a height reminder.

For a puppy, MidWest advises buying for the expected adult size and using a divider panel to reduce the space while the puppy grows.

The method follows the published sizing guides from MidWest Homes for Pets and Petmate. Required length is the nose-to-tail-base length plus the allowance. Required height is the standing head-to-floor height plus the allowance. The calculator then picks the smallest nominal size that is at least the required length. Length decides the size; height and weight are checks. Metric entries are converted at exactly 2.54 cm per inch and are not rounded before the size is chosen, even if you switch units back and forth, so a requirement even slightly over a size moves you to the next one up.

The allowance is a rule of thumb, not a standard. Petmate’s guide gives 2 to 4 inches; this tool’s 3 in default is simply the midpoint of that range, and you can change it.

A nominal size is a label, not an interior measurement. MidWest’s 24-inch iCrate measures 23.6 in long on the outside, and its 30-inch iCrate 29.7 in, and MidWest does not state interior dimensions on that product page. Always compare your required length and height with the interior figures the maker gives in the listing.

Going by stated weight ranges, a 60 lb dog usually falls into the 36-inch size: MidWest lists 41–70 lb for its 36-inch iCrate, and seller listings in our snapshot state ranges from 30 to 70 lb for 36-inch crates. Two 60 lb dogs can still differ in length, so measure your dog and let the length decide. If the calculator says 42 in, trust the measurement over the weight chart.

Weight ranges also vary between sources for the same crate. MidWest’s own site states 11–25 lb for the 24-inch iCrate and 26–40 lb for the 30-inch, while MidWest’s Amazon listing titles in our snapshot say 12–20 lb and 21–40 lb. The 36-inch range agrees (41–70 lb). The calculator’s weight cross-check uses the MidWest product page figures below.

The calculator recommends from 24 to 48 in, the sizes on our listing shelf. MidWest also makes 18- and 22-inch iCrates; if your required length is well under 24 in, compare those sizes’ interior figures too.

Crate size to dog weight, from seller listings

The measuring method is restated from MidWest’s sizing guide; the 2–4 in allowance range is from Petmate’s buyer’s guide. Exterior dimensions and pet weights come from MidWest’s iCrate product page. Seller weight ranges were parsed from the titles of 378 unique non-sponsored listings in our September 27, 2026 snapshot; only titles stating “lb” or “lbs” were counted, and a size is shown only when at least three listings state a range. Unit conversions use exact definitions: 1 in = 2.54 cm and 1 lb = 0.45359237 kg. Results keep full precision until the size is chosen, including after unit switches; displayed required dimensions are rounded up to 0.01. The tool does not cover interior dimensions, breed charts or outdoor kennels.

• MidWest Homes for Pets – What Size Crate Should I Get? (measuring method)
• Petmate – Indoor Dog Kennels: A Complete Buyer’s Guide (2–4 in allowance)
• MidWest Homes for Pets – iCrate product page (dimensions, pet weights)
• NIST – SI Units: Length (inch definition)
• Wikipedia – Pound (mass) (pound definition)

This tool gives an estimate based on a manufacturer sizing rule of thumb and seller listing data; it is not veterinary or welfare advice and makes no safety, escape-proof, recall or crash-test claims, so check the dimensions and instructions on the product listing and ask a veterinarian about your dog’s individual needs.

Last updated: October 2026

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