Rug Size Calculator

The Rug Size Calculator takes the guesswork out of buying an area rug. Instead of hoping an 8×10 "looks about right," it applies the same furniture-layout rules that interior designers use for each type of room, sizes the rug from your exact room and furniture dimensions, snaps the result to a standard size you can actually buy, and draws a true-to-scale top-down floor plan so you can see the fit before you spend a cent.

Why Rug Size Matters

A rug that is too small is the single most common decorating mistake. A small rug makes furniture look like it is floating on an island, shrinks the room visually, and leaves the space feeling unbalanced. A correctly sized rug does the opposite: it anchors the furniture, defines the zone, and makes the whole room feel larger and more intentional. Because rugs are a significant purchase and awkward to return, getting the size right the first time saves both money and frustration.

Rug Sizing Rules by Room

🛋️ Living Room

Living-room rugs are sized around your seating and how much furniture sits on the rug. There are three accepted layouts:

Whichever layout you pick, leave a consistent frame of bare floor — roughly 8 to 24 inches (20–60 cm) — between the rug and the walls.

🍽️ Dining Room

The dining rule is about the chairs, not the table. The rug must extend at least 24 inches (about 60 cm) beyond every edge of the table so that when someone pushes their chair back to sit down or stand up, all four chair legs stay on the rug. If the back legs drop off the edge the chair catches and the rug bunches. Match the rug shape to the table: rectangular rug for a rectangular table, round rug for a round table.

🛏️ Bedroom

For a rug placed under the bed, aim for 18 to 24 inches (45–60 cm) of rug showing along both sides and the foot of the bed — that soft border is what you step onto in the morning. The rug's top edge usually lines up with the headboard, leaving your nightstands on the bare floor. Smaller alternatives include a pair of runners along each side of the bed, or a single rug across the foot.

Standard Rug Sizes

Area rugs are sold in a set of common sizes. Knowing them helps you match a real product to your ideal dimensions.

Round rugs are commonly sold in 4, 6 and 8 foot diameters (about 120, 180 and 240 cm), and runners in 2.5 × 8 or 2.5 × 10 feet for hallways and bedside use.

How to Use This Calculator

1. Pick your room type: Living Room, Dining Room, or Bedroom — each uses its own sizing rule.
2. Choose your units and enter room size: switch between feet/inches and centimeters, then enter your room length and width.
3. Add your furniture: the living-room layout style, your dining table dimensions and chair clearance, or your bed size and desired overhang.
4. Click Calculate: you get the ideal size, the recommended standard rug, and a scale floor plan.
5. Review the fit: the diagram shows the rug under your furniture, and the notes tell you exactly how much clearance and bare floor you will have.

Tips for Getting Rug Size Right

• Tape it out. Before buying, mark your calculated rug size on the floor with painter's tape and live with it for a day.
• When in doubt, size up. A slightly larger rug almost always looks better than one that is too small.
• Keep the frame even. Aim for the same border of bare floor on all sides so the rug reads as centered.
• Mind the doors. In dining and bedrooms, check that doors and drawers still clear the rug's thickness.
• Use a rug pad. Cut about 1 inch smaller than the rug on all sides for grip and cushioning.

Frequently Asked Questions

What size rug do I need for my living room?

As a rule, leave 8 to 24 inches of bare floor between the rug and the walls, and make the rug large enough that at least the front legs of your sofa and chairs rest on it. For most living rooms an 8×10 or 9×12 rug works; smaller rooms suit a 5×8 or 6×9. This calculator sizes the rug from your exact room dimensions and layout style.

What size rug goes under a dining table?

A dining rug should extend at least 24 inches (about 60 cm) beyond every edge of the table so chairs stay on the rug when pulled out. For a standard 6-seat rectangular table, that usually means an 8×10 rug; an 8-seat table often needs a 9×12. Round tables pair with round rugs sized the same way.

What size rug fits under a queen or king bed?

For a rug placed under the bed, aim for 18 to 24 inches of rug showing along both sides and the foot. A Queen bed usually suits an 8×10 rug and a King bed a 9×12. The rug's top edge is typically aligned with the headboard so nightstands sit on the floor.

Should all furniture legs be on the rug?

There are three accepted layouts. All-legs-on (every leg on the rug) feels the most luxurious and needs the largest rug. Front-legs-on (only the front legs of seating on the rug) is the most popular and space-efficient. Floating (no furniture on the rug) works only in small rooms and can make a space feel disconnected if the rug is too small.

How much bare floor should show around a rug?

Designers recommend a consistent border of bare floor framing the rug, usually 8 to 24 inches (about 20 to 60 cm) depending on room size. Larger rooms can take a wider frame. The border should be even on all sides so the rug looks centered and intentional.

What are standard rug sizes?

Common rectangular rug sizes are 2×3, 3×5, 4×6, 5×8, 6×9, 8×10, 9×12, 10×14 and 12×15 feet. Common round sizes are 4, 6 and 8 feet in diameter. In metric, popular sizes include 120×170, 160×230, 200×290 and 240×340 cm.

Additional Resources

• Carpet and Rugs - Wikipedia