Sizing
What size urn do I need?
There is one rule, and it is easy: allow one cubic inch of urn capacity for every pound of body weight before cremation. Everything below is that rule applied to real sizes.
3 min read
The one-pound, one-cubic-inch rule
A person who weighed 165 lb needs at least 165 cubic inches of capacity. Cremated remains are bone fragments reduced to a coarse ash, and the volume tracks body weight closely enough that this estimate is what crematories and manufacturers both use.
Height, age and build do not change the calculation. If the weight is not known, use the nearest honest estimate and round up to the next size.
When to size up
Round up if the weight is within 20 lb of a size limit, if you want the option of adding a small amount of another family member's remains later, or if you plan to keep the crematory bag intact inside the urn — the bag itself takes a little room.
Dividing remains between family
Keepsake urns hold a small portion, typically 3–50 cubic inches, so several family members can each keep some. Many families buy one full-size urn plus two or three keepsakes rather than splitting everything evenly.
Cremation urn size chart
Capacity in cubic inches, and the body weight each size comfortably holds.
| Urn size | Capacity | Suits body weight up to |
|---|---|---|
| Keepsake | 3–50 cu in | A shared portion |
| Small / infant | 20–80 cu in | 80 lb |
| Medium / youth | 100–160 cu in | 160 lb |
| Adult (standard) | 180–220 cu in | 200 lb |
| Extra large | 250–320 cu in | 300 lb |
| Companion | 350–420 cu in | Two adults |
Common questions
- What is the standard urn size?
- 200 cubic inches. It is the size most adult urns are made to and covers most adults up to about 200 lb.
- What size urn for a child or infant?
- Use the same rule — one cubic inch per pound. Infant urns are usually 20–40 cubic inches; youth sizes run 80–160.
- Is it a problem if the urn is too large?
- No. Extra space inside an urn is not visible and causes no issue. Too small is the only real mistake.
- How many cubic inches is a standard urn?
- 200 cubic inches. Use the urn size chart above to match capacity to body weight before cremation.
- What if I don't know the exact weight?
- Estimate honestly and round up to the next size. Extra capacity is invisible; too little means a return.
- How do I measure an urn for a columbarium niche?
- Ask the cemetery for the niche's interior height, width and depth, then compare against the urn's exterior dimensions — not its capacity. Leave at least a quarter inch of clearance.
Sources and further reading
- Cremation Association of North America
Industry body for cremation statistics and practice standards.
- FTC Funeral Rule — Consumer Guide
Confirms a funeral home must accept an urn you bought elsewhere, with no handling fee.
Shop the urns in this guide
Adult urns
Full-size, 180 cu in and up
Keepsake urns
Small portions to share
Marble urns
Stone in every size
Wood urns
Hardwood, adult capacity
Not sure what you need? Call (877) 281-0752 or see the size guide.