Urn Size Calculator for Fire and Hydro Cremation

How do I calculate the right size of an urn I need?

Just like people and pets, urns come in many different shapes and sizes. The general rule of thumb is for every pound of the person's total weight you will need one cubic inch of space. So if a person weighed 150 lbs. you will need an urn that is 150 cubic inches or larger.

This rule works well for the ashes from the fire-based cremation where ashes are usually different shades of gray and gritty in texture. Ashes from the alkaline hydrolysis (hydro cremation) have 20% more volume and have a clean, uniform and white appearance.

Use this cremation urn size calculator to help you find the right size cremation urn. Enter the weight of your loved one or beloved pet and then "Calculate." If you have ashes from the hydro cremation, please check the "Hydro Cremation Ashes" box to get correct numbers.


Loved One's or Pet's Weight in Pounds
Cups of Ashes (1 Cup = 8 Fluid Ounces)
Minimum Urn Size Needed in Cubic Inches
Hydro Cremation Ashes:
1 Pound = 1 Cubic Inch
1 Cup = 14.44 Cubic Inches