How to Choose the Right Urn Size for Your Pet: Capacity Guide & Weight Chart
Many pet owners struggle with one thing: how big should the urn be?
This guide uses industry-standard formulas and a practical chart to help you pick the correct size with confidence.
Why Urn Size Matters
Choosing too small an urn is one of the most common mistakes.
Once fire cremation is completed, the volume of remains depends on:
- bone density
- pet’s original weight
- cremation temperature
Industry Formula for Urn Capacity
1 lb of body weight ≈ 1 cubic inch of ashes
1 kg ≈ 54–60 cubic inches
This formula comes from standard guidelines used by pet cremation associations worldwide.
Pet Weight → Recommended Urn Size
| Size | High（H） | Lenth（W） | Weight |
|---|---|---|---|
| S | 18 cm（7.09 in） | 10 cm（3.94 in） | up to 25 kg |
| M | 19.8 cm（7.87 in） | 11 cm（4.33 in） | up to 35 kg |
| L | 22 cm（8.66 in） | 12 cm（4.72 in） | up to 50 kg |
Why You Should Add 20% Extra Space
The final ash volume varies due to:
- cremation chamber differences
- temperature differences
- how bone fragments are processed
Most cremation facilities recommend 15–25% extra space.
Key Takeaway
Choosing the right size ensures dignity, safety, and long-term preservation.
Cover Image Suggestion (for Midjourney / DALL·E)
A soft, minimalist illustration of different urn sizes arranged in a clean comparison layout, pastel tones, pet silhouette icons, and modern editorial style.