Storage Unit Size Calculator

Check the estimate

How the estimate works

Start with what takes floor space

List the boxes, mattresses, appliances, and furniture that cannot stack safely. Bedroom count is a useful first guess, but the awkward pieces usually decide whether you need to move up a unit size.

Storage unit planning checkpoints

• Small load: Compare 5x5 and 5x10 units; Count boxes, then measure the largest piece
• Apartment or several rooms: Compare 5x10 and 10x10 units; Check mattresses, appliances, shelving, and safe stacking
• Items you will need later: Leave an aisle instead of packing wall to wall; Keep doors, labels, and fragile boxes reachable

Worked examples

• A stack of uniform moving boxes may fit in a 5x5 unit, but a sofa or queen mattress can force the move to a 5x10.
• A one-bedroom apartment with a mattress, sofa, dining set, and appliances can use more floor space than a box-heavy two-bedroom move.
• A unit that holds everything on move-in day may still be too small if you need to reach seasonal clothes or business records each month.

Common mistakes

• Choosing from bedroom count without listing bulky furniture and appliances.
• Assuming every box or bin can be stacked safely.
• Filling the unit wall to wall when items must remain accessible.
• Ignoring door width, hallway turns, elevator access, or facility rules.

When this calculator is not enough

• The storage facility uses unusual unit dimensions or access restrictions.
• Items need climate control, specialty handling, insurance, or prohibited-item review.
• A moving company or storage provider must confirm whether furniture will fit through the access route.

Methodology

The calculator estimates the space used by the entered belongings and packing density, then compares that estimate with common unit sizes. Access aisles and fragile items use extra floor space, so treat them as part of the plan instead of hoping they fit at the end.