Your crate pick
MidWest iCrate double door, 42 inch
Wire crate with a divider and removable tray. Confirm the exact model, included divider and inside dimensions.
Check current price on AmazonTHE PUPPY CRATE SIZE CALCULATORFree, no account.
Find the right crate size
for your puppy.
Pick the breed and age. Get the crate to buy, where to set the divider today,
and the dates to move it.
Your crate planLive estimate
42INCHES
Buy for the grown dog
wire cratewith a divider.
Set the divider to about 24 inches of space today.
Assumes a 10-week-old Labrador Retriever, crating for house training. Change any detail and the plan updates. Plan starts today.
Why this size? About 34.3″ nose-to-tail-base length + 4″ of room, rounded up to the 42″ home-crate size. Adult length and headroom are estimates.
Your puppy’s space todaySide view, in inches
Set the divider today
About 24 inches of space.
Estimate from typical large-breed growth; your vet’s weigh-ins and your dog’s measurements beat this. Measure from the inside front wall to the divider.
A little more room, right on time.
3 reminders- 1In about 4 weeks14 weeks old30 inches
- 2In about 9 weeks19 weeks old36 inches
- In about 16 weeks26 weeks old · about 6 monthsRemove divider
Estimated fit-check dates, not deadlines. Move sooner if your puppy needs room. Removing the divider does not mean growth is finished.
Always enough room to stand, turn around and lie down comfortably.
Free, no account.
The right starting kit.
Confirm dimensions on the listing. Check inside height, floor width and door clearance; the size on the box is not the usable interior.
Plastic alternative
Petmate Ultra Vari Kennel, 48 inch
For a more enclosed den. Plastic sizing differs from wire; there is no assumed divider compatibility.
Check current price on AmazonWashable pad
MidWest QuietTime Fleece Pet Bed, 42 inch
Sized for the full wire crate after divider removal. Match the actual floor dimensions; wait if your puppy soils or shreds bedding.
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Tell us about your puppy.
A few details now. A crate that fits later.
Your plan updates as soon as you change a detail.
How it works
Buy once. Make room as they grow.
- 1
Pick your puppy's breed and age.
- 2
We size the crate for the grown dog and set the divider for today.
- 3
Add the reminders and move the divider when your calendar says so.
Always check your puppy's comfort first. Calendar dates are estimated reminders to check the fit.
Questions
Before the big box arrives.
A few things worth knowing.
Why not buy a small crate now?
You can, but you may need to replace it as your puppy grows. An adult-size wire crate with a compatible divider lets you adjust the usable space instead of buying another crate. This calculator is a starting point: measure your dog before placing the order.
Is bigger always better?
Not for house training. A lot of spare space can become a separate toilet area. But too little space is uncomfortable: your puppy must always be able to stand naturally, turn around and lie down comfortably. Never keep the divider close just to follow this schedule.
Wire, plastic or soft crate?
Wire crates are easy to ventilate and often accept a divider. Plastic kennels offer a more enclosed space, but their usable interiors are smaller than their exterior size suggests. Soft crates are only an option for relaxed, already crate-trained dogs that do not chew or escape, so they are not our puppy starter pick. No ordinary crate is automatically crash-safe.
My dog is a mix, how close is this?
Choose ‘Mixed or not sure’ and your vet or shelter’s adult-weight estimate. We use a typical shoulder height for that weight band, not a guessed breed. Body shape varies a lot. Long-backed, broad or especially tall dogs need a hands-on fit check; a weight band cannot guarantee the right size.
Do I really need a divider?
A divider is useful when a puppy has much more room than needed in an adult-size crate. Use only a divider approved for that exact crate and follow the manufacturer’s installation instructions. Check the space every week and after growth spurts. The calendar is a reminder to check fit, not a command to move it on that date.
How long can a puppy stay in a crate?
A common trainer rule of thumb is about one hour per month of age, with less time for very young puppies. That is not veterinary advice or a target to work up to. A puppy may need breaks far sooner, especially when awake, after meals or after play. We cap workday planning cues at four hours. Arrange frequent toilet, movement and companionship breaks, build comfort gradually and never leave a panicking dog in a crate.
How do you make money?
Crate Sizer is free. The product links go to Amazon, and when you buy through one, Amazon pays us a small commission at no extra cost to you. The picks follow the sizing math on your plan, and no brand pays to be listed.
Breed standards in. Clear estimates out.
We use published adult shoulder-height and weight references for 63 breed choices. Estimated nose-to-tail-base length uses a body-proportion multiplier, then adds 4 inches of room. Head-height estimates add head allowance and 3 inches of clearance. We round up to a standard home-crate size and check a generic height allowance. These allowances are planning assumptions, not product interior specifications.
Puppy lengths use an illustrative size-band growth curve, then round divider space up to the next 6 inches. The schedule marks those steps. Small breeds approach adult length earlier than giant breeds; individual dogs vary. Mixed breeds use the chosen weight band. No formula replaces a real measurement, your vet or a trainer.