What size urn does your dog need?
Dogs leave about 3-5% of body weight[1] as ashes, and the urn industry sizes by volume, not weight. Enter your dog's weight to get cubic inches, milliliters and a standard urn size that fits.
- Cubic inches and milliliters
- Room to spare built in
- Split between several urns
Urn size calculator
Enter your pet's healthy adult weight. We size the urn using the industry rule of 1 cubic inch per pound, plus 10% room to spare.
Recommended urn size
55 cu in (901 mL)
Look for: Medium (up to 60 cu in)
| Total ashes (by volume) | 50 cu in (819 mL) |
|---|---|
| Expected ash weight | 1.5 lb–2.5 lb |
| Urn with 10% margin | 55 cu in (901 mL) |
Standard sizes: small up to 20, medium up to 60, large up to 120 and extra large 200+ cubic inches. If you're between sizes, choose the larger one.
Source: Embrace Pet Insurance - Bury or Cremate Your Dog? Costs, Pros & Cons; Our estimate. 1 cu in per lb is an industry rule of thumb
Next step: Find urns and prices near you →
Using the tool
How to size a dog urn in three steps
- Enter your dog's healthy adult weight. Use pounds or kilograms. A dog who was thin at the end still has an adult skeleton, and bone is what becomes ash, so their fuller weight gives a safer size.
- Choose how many households will share. One if the ashes stay together; up to eight if you're dividing them among family.
- Tick keepsakes if you want them. The tool sets aside about 3 cubic inches per person for a small keepsake urn before sizing the main one.
You'll see the volume you need in cubic inches and milliliters, the standard urn size that fits, and the expected weight of the ashes for reference.
The rule behind it
The one-cubic-inch-per-pound rule, explained
Urn makers use a simple rule of thumb: one cubic inch of space for every pound of body weight. It works because cremated bone is fairly consistent in density. We then add 10% so the ashes, which come in a sealed bag, fit without a struggle. Our own worked figures show how quickly the numbers climb:
12 cu in (cat); 70 cu in (dog)[2]
The tool then matches that volume to the size bands most urn sellers use: small (up to 20 cubic inches), medium (up to 60), large (up to 120) and extra large (200 or more). If your dog falls between two sizes, always go up. An urn that's slightly roomy is fine; one that won't close is heartbreaking.
Example
Worked example: an 80 lb German Shepherd shared by three siblings
Say your dog, Max, is an 80 lb German Shepherd. On his own, he needs 80 cubic inches plus 10%, so about 88 cubic inches (roughly 1,440 mL). That's a large urn, and there's comfortable room in a standard 100 to 120 cubic inch model.
Now say three grown siblings each want a portion, plus a small keepsake each. The tool sets aside 9 cubic inches for three keepsakes, leaves 71 to share, and suggests three urns of about 26 cubic inches each. Those fall into the medium band.
| Dog | Weight | Volume needed | Urn size |
|---|---|---|---|
| Chihuahua | 6 lb | about 7 cu in | Small |
| Beagle | 25 lb | about 28 cu in | Medium |
| Border Collie | 45 lb | about 50 cu in | Medium |
| Labrador | 70 lb | about 77 cu in | Large |
| German Shepherd | 80 lb | about 88 cu in | Large |
| Great Dane | 140 lb | about 154 cu in | Extra large |
Big dogs
Giant breeds: when a standard urn isn't enough
Mastiffs, Newfoundlands and Great Danes regularly top 120 lb, and some pass 180 lb. In a UK study of giant-breed dogs, the median adult weight was 48.8 kg[3]. Our estimate for a dog that size is about 3.8 lb[4] of ashes, needing around 108 cubic inches before the margin, which just squeezes into a large urn and fits an extra large one comfortably.
For a dog of about 110 to 200 lb, the tool points you to an extra large urn. Past roughly 200 lb, the volume with margin tops 220 cubic inches and the tool suggests a large-animal urn, a wooden chest-style box or two matching urns instead. Figurine urns shaped like a breed are usually too small for a giant dog's full ashes, so many families pair one with a larger plain urn. Our guide to urn sizing and selection for dogs compares materials and shapes.
Which urn style would suit your dog best?
Tap an answer to vote and see how others answered. Anonymous.
Worth knowing
What the calculator can't account for
Real ash volume varies. Dogs with dense bones, such as working breeds, can return more than the rule predicts, and some crematories process ashes more finely than others. Water cremation often returns a little more by volume. The 10% margin covers most of this, but not every case. For a sense of scale, a forensic study of 100 human cremations found remains averaged about 3.5% of adult body weight, and dogs return a similar share.
Also check the urn's stated capacity, not its outside size. A heavy stone urn can look huge and hold surprisingly little. Prices vary even more than sizes: one industry report puts personalized pet urns at roughly USD 50–1,000+[5]. If you're sharing between several people, the ashes sharing planner handles pendants and rings as well as keepsake urns.
Next
After you know the size
Most crematories return ashes in a basic container, so there's no rush to buy an urn before the cremation. Take the number from the tool, ask your provider what their included container holds, and decide afterwards. The ashes weight estimator tells you how heavy the ashes will be if you're choosing a wall shelf or a garden niche.
If you haven't arranged the cremation yet, our overview of dog cremation services explains the options, and you can ask us for local prices. For more personal ideas than an urn, see memorial ideas for dogs. Our local dog cremation pages cover prices near you, and private vs communal cremation explains which service returns ashes at all.
Reader polls
What would you choose?
Vote anonymously and see how other readers answered. The results are live counts from people who visit this site, so they show real opinions, not a scientific sample.
Which urn style would suit your dog best?
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Where are (or will be) your pet's ashes?
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What will you do (or did you do) with your dog's ashes?
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Free tools to help you plan
Urn size calculator
Find the urn volume you need from your pet's weight, plus keepsake and sharing options.
Ashes weight estimator
See roughly how much ash to expect back, by species and body weight.
Ashes sharing planner
Split ashes fairly between family members, keepsake urns and jewelry.
Questions people ask
What size urn do I need for a 50 lb dog?
About 55 cubic inches, which is 50 cubic inches for the ashes plus a 10% margin. That fits a medium urn rated up to 60 cubic inches, but it's close to the limit. If the urn you like is rated at exactly 50 or 55, choose the next size up to be safe.
Should I use my dog's current weight or their healthy weight?
Use their healthy adult weight. Ashes come mostly from bone, and a dog who lost weight to illness still has the same skeleton. Sizing from a lower, end-of-life weight is the most common reason families end up with an urn that's too small.
Can I put my dog's collar or tag in the urn too?
Often, yes, if there's room. A collar takes more space than you'd think, so add around 10 to 15 cubic inches or pick an urn with a separate compartment or photo drawer. Some families hang the tag on the outside of the urn instead.
How many milliliters is a cubic inch?
One cubic inch is about 16.4 milliliters. So a 70 cubic inch urn holds roughly 1,150 mL, a little over a liter. The calculator shows both units because urns sold in the UK, Europe and Australia are often listed in milliliters or liters.
Sources and our estimates
- [1] Embrace notes cremated remains typically weigh about 3-5% of the pet's original body weight. Embrace Pet Insurance - Bury or Cremate Your Dog? Costs, Pros & Cons, 2025.
- [2] Using the industry rule of thumb of 1 cubic inch of urn space per pound of body weight, a 12 lb cat needs an urn of about 12 cubic inches; a 70 lb dog needs about 70 cubic inches. Our estimate: urn cu in = body weight lb x 1 (industry rule of thumb, not a measured value). How we calculate.
- [3] Giant-breed dogs had a median adult bodyweight of 48.8 kg (about 108 lb), with a range up to 100 kg. O'Neill DG et al. Giant dog breeds under primary veterinary care in the UK: demography, common disorders and mortality. Companion Animal Health and Genetics, 2026 (PMID 42351280), 2026.
- [4] A median-weight giant-breed dog (48.8 kg / 108 lb) would be expected to return about 1.71 kg (3.8 lb) of cremated remains, needing an urn of about 108 cubic inches. Our estimate: 48.8 kg x 3.5% x 2.2046 lb/kg; urn = 108 lb x 1 cu in/lb. How we calculate.
- [5] Personalized pet urns range from about USD 50 to more than USD 1,000. Astute Analytica via GlobeNewswire — Global Pet Preservation Services Market to Hit USD 112.7 Million by 2032 (Apr 2, 2024), 2024.
Need an urn and a cremation provider?
Tell us what you need and where you are. We'll reply by email with clear options and prices so you can decide in your own time.