Companion Urn for Two — Sizing, Placement, and What Cemeteries Accept

Couples who both choose cremation often want their remains kept together in a single urn. A companion urn (also called a double urn) is designed for exactly this — one container, two people's ashes, one placement location.

Companion Urn Sizing

A standard adult urn holds 175 to 225 cubic inches, enough for one person weighing up to 200–220 pounds. A companion urn holds 400 to 600 cubic inches — roughly double — to accommodate both adults' remains.

The same sizing rule applies: 1 cubic inch per pound of pre-cremation body weight, per person. Add both weights together plus a 10% buffer.

If one partner weighed 170 pounds and the other 190, the combined need is 360 cubic inches plus buffer — about 400 cubic inches minimum. A standard companion urn at 400 to 600 cubic inches covers this comfortably.

The Timing Challenge

One partner usually dies first, sometimes years before the other. During that gap, the first person's remains need a home. Three approaches work:

1. Buy the companion urn now and store it partially filled. The urn sits on display or in a niche with one person's ashes. The other half stays empty until needed. Some niches allow this — confirm with the cemetery.

2. Use a temporary container for the first person's ashes. When the second person dies, transfer both sets of remains into the companion urn. Crematories return ashes in a basic temporary box that can hold the remains while the family takes weeks or months to select a permanent urn or plan a scattering.

3. Buy a keepsake urn for the first person and plan to purchase the companion urn later. This works if you're unsure of the final placement or if the second partner's preferences may change.

Columbarium Niche Fit

This is where companion urns cause problems. A standard columbarium niche is built for one adult urn — roughly 12 × 12 × 12 inches or similar. Companion urns, being substantially larger, frequently exceed standard niche dimensions.

Options:

• Double-width niche — some columbaria offer wider niches designed for companion urns or two individual urns side by side
• Oversized niche — less common, but some newer facilities have them
• Two standard niches — buying adjacent niches and placing one individual urn in each

Before purchasing a companion urn for columbarium placement, get the exact interior niche dimensions from the cemetery in writing. Measure the urn's full exterior — including lid height, base width, and any decorative handles or finials.

In-Ground Burial

Burying a companion urn requires an in-ground urn vault large enough to hold it. Standard urn vaults are built for standard single urns. A companion urn may need:

• A companion urn vault (larger interior cavity, available in concrete, polymer, or metal)
• A standard-size burial plot — companion urns generally fit within a standard cremation plot, but confirm with the cemetery

The vault's interior dimensions, not just its labeled capacity, are what matter. The urn needs to physically slide into the vault cavity with clearance.

Material Considerations

Companion urns come in the same materials as single urns — brass, bronze, wood, ceramic, marble, and biodegradable. For a permanent placement (columbarium or burial), brass and bronze give the best long-term durability. For home display, any material works.

The heavier the material, the heavier the final weight with two sets of remains inside. A marble companion urn fully loaded can weigh 20+ pounds, which matters if it needs to sit on a shelf.

The Casket & Urn Selection Guide includes an urn volume calculator and a columbarium compatibility checklist — covering single, oversized, and companion sizing — so you can confirm the fit before making a purchase that can't easily be returned.