For a full term baby up to 4 oz. In general, a standard urn measures 200 cubic inches in size. First select the currency you are most comfortable paying in. So the easy starting point is to find out what your loved one weighed before cremation. So thats how it goes after cremation. If the funeral home informs you that your loved ones ashes are ready to be picked up, this could add more stress. There are a few possible explanations for why ashes might be heavy after cremation. We use cookies to track clicks, share data (but never your private stuff) with trusted social media, advertising & analytics partners to personalize your experience. Buy an urn slightly larger than calculated to avoid having the urn be to small for the ashes. Adult human ashes, in contrast to a box of campfire ashes, can be surprisingly heavy. However, the weight can range from as little as 3 pounds (1.4 kilograms) to as much as 30 pounds (13.6 kilograms), depending on the size and weight of the person before cremation. //-->