Rug Size Calculator

What is a Rug Size Calculator?

A rug size calculator helps you find the perfect rug dimensions for any room based on your room measurements, rug shape preference, and how much floor you want to leave uncovered. Choosing the right rug size is essential for creating a balanced, visually appealing space that anchors your furniture properly. The calculator supports rectangle, square, runner, circle, oval, and octagon rugs, and accounts for architectural features like fireplaces or fixed cupboards that reduce available floor space.

How to Use the Rug Size Calculator

Using the rug size calculator is simple. Start by selecting your preferred rug shape. Then enter your room width and length in feet. Adjust the bare floor perimeter to control how much floor remains visible around the rug edges (the default is 1.5 feet). If your room has any fixed extrusions like a fireplace or built-in cabinet, enter their width and length to exclude that area. For runner rugs, you can select a standard runner width. Optionally enter a cost per square foot to estimate the total rug price. The calculator instantly shows your custom rug dimensions, total area, and the closest standard rug size available in stores.

Rug Size Formulas by Shape

For all shapes, the effective rug width and length are calculated by subtracting the bare floor perimeter and any extrusion from the room dimensions:

$$W_r = W_s - W_e - P$$

$$L_r = L_s - L_e - P$$

Where $$W_r$$ and $$L_r$$ are the rug width and length, $$W_s$$ and $$L_s$$ are the room dimensions, $$W_e$$ and $$L_e$$ are extrusion dimensions, and $$P$$ is the bare floor perimeter.

Rectangle Rug: The rug dimensions equal the effective width and length. Area = $$W_r \times L_r$$.

Square Rug: Both sides equal the shorter of the effective width and length.

Runner Rug: Width is a standard runner width (2, 2.5, or 3 ft), length equals the effective room length.

Circle Rug: Diameter equals the shorter effective side. Area = $$\pi (d/2)^2$$.

Oval Rug: Area = $$\pi (W_r/2)(L_r/2)$$.

Octagon Rug: Side length = $$W_r \times 0.4142$$. Area = $$s^2 \times 4.8284$$.

Standard Rug Sizes

If you prefer buying a ready-made rug rather than ordering custom, here are the most common standard sizes:

Rectangle and Oval: 3x5, 4x6, 5x8, 6x9, 8x10, 9x12, 10x14, 12x15, 12x18 feet.

Square, Circle, and Octagon: 4x4, 6x6, 8x8, 10x10, 12x12 feet.

Runner: 2x6, 2x8, 2x10, 2.5x8, 2.5x10, 2.5x12, 3x10, 3x12, 3x15 feet.

The calculator automatically finds the closest standard size to your custom dimensions so you can decide whether to go custom or buy off the shelf.

Tips for Choosing the Right Rug Size

In a living room, choose a rug large enough that the front legs of your sofa and chairs rest on it. In a dining room, the rug should extend at least 24 inches beyond the table on all sides so chairs remain on the rug when pulled out. In a bedroom, the rug should extend at least 18 inches beyond the sides and foot of the bed. For hallways, a runner that leaves 4 to 6 inches of floor on each side creates a balanced look. Always measure your room carefully and use the rug size calculator to confirm the fit before making a purchase.

For other home decor sizing tools, check out the Picture Frame Size Calculator and Bed Size Calculator.

Frequently Asked Questions

How much space should be between the rug and the wall?

Leave 12 to 18 inches of bare floor between the edge of the rug and the walls. This creates a balanced frame of flooring around the rug and prevents the room from feeling wall-to-wall carpeted.

What size rug do I need for a 12x12 room?

For a 12x12 ft square room with 1.5 ft of bare floor on each side, the ideal rug size is 10.5x10.5 ft. The closest standard square rug size is 10x10 ft. If you prefer a rectangle rug, consider a 9x12 ft or 10x14 ft layout centered in the room.

Should a rug go under furniture?

Yes, a rug should typically go under furniture to anchor the space. In living rooms, the front legs of sofas and chairs should rest on the rug. In bedrooms, the rug should extend at least 18 inches beyond the sides and foot of the bed. In dining rooms, all chair legs should remain on the rug even when pulled out.

What is the standard runner rug size for a hallway?

Standard runner rug sizes are 2 to 3 feet wide and 6 to 15 feet long. For most hallways, a 2.5 ft wide runner that leaves 4 to 6 inches of floor on each side works well. The length should be about the full hallway length minus 1 to 2 ft of bare floor at each end.

How do I measure my room for a rug?

Measure the length and width of the area where you want to place the rug using a tape measure. Record the dimensions in feet. Note any fixed obstacles like fireplaces, radiators, or built-in cabinets that protrude into the room. Enter all measurements into the rug size calculator to get your recommended rug dimensions.

What is the best rug shape for a dining room?

A rectangle or oval rug works best under a rectangular dining table. If you have a round dining table, a circle rug creates a cohesive look. In either case, ensure the rug extends at least 24 inches beyond the table edge on all sides.

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