How does the Sofa Problem corner math work?

The corner scenario computes clearance utilizing the moving sofa mathematical principle, calculating the absolute maximum geometric object length that can navigate an L-turn given specific intersecting corridor widths.

Will my sofa fit through a standard doorway?

A standard US interior doorway is 30-32 inches wide and 80 inches tall. Most sofas need to be tilted vertically or rotated on their side to pass through. Use ClearanceCalc to check your exact dimensions instantly.

ClearanceCalc - Furniture & Appliance Fit Calculator

Awaiting Profile Matrix

Please populate object sizes and target architecture specs to run the clearance models.

Essential Moving Guidance

Measuring Clearances: Deduct projections like door handles, baseboards, or surface-mounted light sconces from entry widths before calculation.
Soft Obstacles: Thick fabric armchairs or plush cushions can compress up to 1-2 inches with continuous physical force.
Pivot Radii: If your ceiling height is greater than the total length of the object, turning vertically on its end is an effective option to escape tight hallway corners.
Safety Buffer: Always allow a minimum 1-2 inch buffer beyond the calculated maximum — exact-fit scenarios risk wedge-locking.

How to Calculate Moving Clearance

The 90° Hallway Corner Problem

Moving a large sofa or appliance around a 90-degree hallway corner is one of the most common moving challenges. As the item rotates, its depth simultaneously occupies space in both corridors.

ClearanceCalc uses a geometric bound based on the moving sofa problem to calculate the maximum safe length for any corner configuration.

Frequently Asked Questions

What if my measurement equals the maximum safe length?

Add a 1-2 inch safety buffer. Exact-fit scenarios risk wedge-locking your furniture in the corner with no room to maneuver.

Why keep a fridge upright after moving?

Tilting causes compressor oil to migrate into the cooling lines. Allow 2-4 hours upright before plugging in to prevent permanent damage.

ClearanceCalc

1. Object Physical Profile

2. Architectural Constraint