It is important to choose the correct urn size to estimate the volume of ashes based on the deceased’s weight. Usually, human ashes weigh about 3.5% of the deceased’s weight, or 3–7 pounds (1.4–3.2 kg) for an adult. For example, the weight of ashes from a 180-pound person is about 6.3 pounds.
1 pound of body weight before cremation equals approximately 1 cubic inch of ashes.In terms of volume, one pound of body weight is roughly equivalent to one cubic inch of ashes after cremation. The required urn volume can be directly converted from the deceased’s weight during their lifetime. The following table compares common weights with recommended urn sizes:
| Ibs | cubic inches of ashes |
| 140 | Choose at least 140 cubic inches |
| 165 | Choose at least 165 cubic inches |
| 190 | Choose a 200 cubic inch adult urn |
| 220 | Consider a larger custom urn or multiple urns |
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