Cremation Urn Sizes: What Size Urn Do I Need?
Cremation Urn Sizes: What Size Urn Do I Need?
One of the most common questions families ask when choosing an urn for ashes is: what size do I need? Getting the size right matters — an urn that is too small will not hold all of the cremated remains, and one that is too large may feel disproportionate for display. This guide explains everything you need to know about cremation urn sizes in Australia.
How Cremation Urn Capacity Is Measured
Cremation urn capacity is measured in cubic inches. One cubic inch of space is needed for approximately one pound (0.45 kg) of a person's body weight. This is the standard rule used by funeral directors and urn manufacturers worldwide.
- A person who weighed 70 kg (154 lbs) would produce approximately 154 cubic inches of cremated remains
- A person who weighed 90 kg (198 lbs) would produce approximately 198 cubic inches of cremated remains
A standard adult cremation urn typically has a capacity of 200 cubic inches — sufficient for most adults.
Standard Cremation Urn Size Categories
Adult Urns (180–300 cubic inches)
Adult cremation urns are the most common size, designed to hold the full volume of cremated remains from an adult. Most adult urns hold between 180 and 220 cubic inches.
Companion and Double Urns (350–500 cubic inches)
Double cremation urns are designed to hold the ashes of two people. They typically have a capacity of 350–500 cubic inches.
Keepsake Urns (1–50 cubic inches)
A keepsake urn is a miniature urn designed to hold a small portion of ashes — typically between 1 and 50 cubic inches.
Infant and Child Urns (20–100 cubic inches)
Urns for infants and children are smaller than adult urns. A newborn produces approximately 20–30 cubic inches of ashes, while a child of 10 years may produce 60–80 cubic inches.
Pet Urns (15–200 cubic inches)
Pet cremation urns vary widely in size. A small cat or rabbit may produce 15–30 cubic inches of ashes, while a large dog may produce 100–200 cubic inches.
Urn Dimensions: What to Expect
- Standard adult urn (200 cu in): Approximately 25–30 cm tall, 15–18 cm wide
- Keepsake urn (20–50 cu in): Approximately 8–12 cm tall, 6–10 cm wide
- Pet urn (small, 30 cu in): Approximately 10–14 cm tall, 8–12 cm wide
- Pet urn (large, 150 cu in): Approximately 20–25 cm tall, 14–18 cm wide
Wooden Urns: Size Considerations
Wooden cremation urns are among the most popular choices for Australian families. Always check the listed cubic inch capacity rather than relying solely on external dimensions. Our small wooden urns are ideal for keepsake use or for children.
What If I Need More Than One Urn?
Many families choose to use more than one urn — a full-sized adult urn combined with one or more keepsake urns for other family members. Cremation jewellery can also be filled with a small amount of ashes and worn daily.
Frequently Asked Questions About Cremation Urn Sizes
What is the standard size for an adult cremation urn in Australia?
The standard adult cremation urn holds 200 cubic inches (approximately 3.3 litres). This is sufficient for most adults.
How do I know if an urn is big enough?
Use the rule of one cubic inch per pound of body weight. A 70 kg (154 lb) person produces approximately 154 cubic inches of ashes, so a 200 cubic inch urn provides comfortable room.
Can I put ashes in an urn that is too big?
Yes. An urn that is slightly larger than needed is perfectly fine. The ashes are typically placed in a sealed bag inside the urn.
What size urn do I need for a pet?
Use the same cubic inch per pound rule. A 5 kg cat produces approximately 11 cubic inches; a 30 kg dog produces approximately 66 cubic inches. Browse our pet urn range with capacity listed for each product.
What size urn fits in a standard columbarium niche?
Most standard columbarium niches in Australia are approximately 30 cm × 30 cm × 30 cm. A standard adult urn will typically fit, but always confirm dimensions with the cemetery before purchasing.