Sofa Size Calculator
Find the ideal sofa size for your living room by checking dimensions against standard traffic flow and clearance guidelines.
Formula
Max sofa length = room length × 2/3; Leave 18-30 in clearance on each side
- Sofa should be no more than 2/3 of the room length.
- Leave at least 18 inches between sofa and coffee table.
- Allow 30+ inches for main walkways and 18 inches for secondary paths.
15×12 ft living room
Inputs
- Room Length: 15 ft
- Room Width: 12 ft
Max sofa = 10 ft (120 in). Room area = 180 sq ft → large room sofa or sectional is suitable.
Frequently asked questions
What sofa fits in a small living room?
For rooms under 10×10 ft, use a loveseat (48-60 in). For 10×12, a standard sofa (72-80 in) works.
How do I measure to get furniture through a door?
Compare sofa diagonal to door opening. Most 84-inch sofas can tilt through a standard 32-inch doorway.
What is a standard sofa size?
Standard sofa: 72-96 inches wide × 30-36 inches deep × 28-36 inches tall.
Should I leave room to walk behind a sofa?
Ideally yes — 18 inches is minimum. If the sofa is against the wall, no clearance needed behind it.