Rug Size Calculator

Almost every rug mistake in a real home is the same mistake: the rug is too small. It floats in the middle of the floor with the furniture stranded around it, and the room reads as disconnected rather than cosy. A correctly sized rug does the opposite, pulling the seating into one group and making the room feel deliberate.

The size you want depends on the room, the layout you are going for, and one decision about where the furniture legs sit.

Room proportion formulas:

Living room, all furniture on the rug (the most formal): Rug Size = (Room Length − 3 ft) × (Room Width − 3 ft) An 18 inch border on each side takes 3 ft off each dimension, not 18 inches. Getting that wrong by a factor of two is the arithmetic slip behind a lot of undersized rugs.

Living room, front legs on the rug (the most common): Front legs of all major furniture pieces rest on rug. Rug typically 2–3 ft beyond sofa edges laterally.

Dining room: Rug Size = Table Length + 48" × Table Width + 48" The 24" on each side allows chairs to slide back without falling off the rug.

Bedroom: Rug extends at least 18" beyond each side and foot of the bed. Standard configurations:

• Queen bed (60" × 80"): minimum 8×10 rug (96" × 120")
• King bed (76" × 80"): minimum 9×12 rug (108" × 144")

Standard rug sizes (US market), all in feet: 2×3, 3×5, 4×6, 5×7, 5×8, 6×9, 8×10, 9×12, 10×14, 12×15

Anything outside that list means a custom rug, which costs several times as much. The calculator always rounds you to one of these.

Worked example: A living room 14 ft × 18 ft, laid out with all the furniture on the rug.

An 18 inch border on every side takes 3 ft off each dimension, so the ideal rug is 11 × 15 ft. Against the standard sizes above, the closest is 12 × 15, which leaves 12 inches of bare floor on the long walls and 18 on the short ones.

Switch to the front-legs layout and the border grows to 24 inches, giving an ideal of 10 × 14, which happens to be a standard size exactly.

Notice how much rug a 14 × 18 room actually wants. People walk into that room holding an 8 × 10 in their heads, and an 8 × 10 in a room that size looks like a bath mat.

Color and pattern guidance: Lighter rugs make rooms feel larger. High-traffic rooms benefit from patterned rugs that hide wear. Low-pile rugs work better under furniture than high-pile (shag).