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Frequently Asked Questions
What is a standard adult urn size in New Zealand?
The industry standard is 200 cubic inches, which equals approximately 3.3 litres. This fits the remains of most adults and includes space for the sealed bag the crematorium returns the ashes in. Our standard adult urns are mostly 3.4 litres (approximately 207 cubic inches), which comfortably fits remains up to and including 90kg once the bag is accounted for. Browse our adult urns.
How do I calculate the urn size I need using kilograms?
Multiply the person's weight in kilograms by 2.2 to get the approximate cubic inches of remains. A 70kg person produces around 154 cubic inches. A standard 200 cubic inch urn fits this comfortably, including room for the sealed bag. If the person weighed over 90kg, consider one of our extra large cremation urns.
Why do the remains come in a bag?
Crematoriums return ashes in a sealed plastic bag inside a temporary container. When you transfer the remains into an urn, the bag goes in as well. The bag takes up more space than the ashes alone — typically an extra 10 to 15 percent of capacity — which is why the practical capacity you need is higher than the weight formula alone suggests.
Can I split the ashes between more than one urn?
Yes, and many NZ families do. One adult urn holds the full remains, and keepsake urns allow individual family members to each have a portion. If someone wants to carry their person with them every day, cremation jewellery works the same way — pendants, bracelets, and rings that hold a small portion of ashes close.
What if I already purchased an urn and it's too small?
This is more common than you'd think, and it's solvable. Message us at orders@forever-urns.co.nz and we'll help you find a suitable option — whether that's a larger adult urn or a way to split the remains into keepsakes so the urn you already have can still be used. Browse our full range of urns for ashes to find the right fit.






