🏠Rug Size Calculator
Calculate the recommended rug size for a room based on floor dimensions and bare-floor margin. Includes round and runner rug support, nearest standard sizes, and optional cost estimate.
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Recommended Rug Area (m²)
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Rug Size Calculator
Choosing the right rug size is one of the most impactful — and most commonly misjudged — decisions in interior design. A rug that is too small makes a room feel disconnected, while one that is too large can make the space feel cramped. This calculator computes the ideal rug dimensions from your room measurements and preferred bare-floor border, then shows the closest standard sizes available.
General rule: leave 45–60 cm (18–24 in) of bare floor visible around all sides of the rug in most rooms.
The rug is often the first design element that anchors a room. It defines zones within open-plan spaces, ties together furniture groupings, and sets the visual floor of a room's color palette. Yet a surprisingly large number of rugs in real homes are undersized — a common mistake that makes furniture appear to float and rooms seem smaller and less cohesive. Getting the size right from the start saves the cost of a return and replacement.
The 18-Inch Rule Explained
The most widely recommended guideline for living rooms, bedrooms, and dining rooms is to leave between 18 inches (45 cm) and 24 inches (60 cm) of bare floor visible around the rug on all sides. This "framing" effect defines the seating or sleeping zone and signals intentional design rather than an undersized accident. In very small rooms or galley corridors, a narrower margin of 10–15 cm is acceptable and sometimes necessary to fit a functional rug at all.
Rug Shapes and When to Use Each
- Rectangle: The most versatile shape, appropriate for living rooms, dining rooms, bedrooms, and home offices. It aligns naturally with furniture groupings and room geometry.
- Round: Works well under round dining tables, in square rooms, in corner conversation nooks, and as a design accent. The calculated diameter uses the shorter room dimension minus the border allowance.
- Runner: Designed for hallways, entryways, and galley kitchens. Standard widths are 60–90 cm; the length should be approximately 2/3 of the corridor length, leaving equal floor visible at each end.
Standard Rug Sizes Reference
| Standard Size (ft) | Metric Approx. | Typical Use |
|---|---|---|
| 4 × 6 | 120 × 180 cm | Small bedroom accent, entryway |
| 5 × 7 | 150 × 210 cm | Small living room, bedroom foot |
| 6 × 9 | 180 × 270 cm | Medium living room or dining room |
| 8 × 10 | 240 × 300 cm | Standard living room, open plan |
| 9 × 12 | 270 × 360 cm | Large living room, great room |
| 10 × 14 | 300 × 425 cm | Very large rooms, open-plan spaces |
Furniture Placement Rules
There are three accepted furniture-to-rug placement arrangements for a living room:
- All legs on: All four legs of every piece of furniture sit on the rug. Requires the largest rug but creates the most unified, formal look.
- Front legs on: The two front legs of the sofa and chairs sit on the rug. This is the most popular option — it visually connects the furniture to the rug without needing a very large size.
- All legs off: The rug floats in the center of the furniture grouping. Only works in very large rooms with oversized furniture where the rug would be impossibly large otherwise.
For dining rooms, the rule is unambiguous: the rug must extend at least 60 cm (24 in) beyond all edges of the dining table so chairs stay on the rug when pulled out for seating.
Rug Pads: The Often-Forgotten Essential
A rug pad underneath prevents slipping on hard floors, extends rug life by reducing fiber abrasion against the floor, adds a small amount of cushioning, and keeps the rug corners flat. Size the pad approximately 2–3 cm smaller than the rug on all sides so it stays invisible at the edges.
Frequently Asked Questions
What rug size do I need for a 12 × 15 ft living room?
For a 12 × 15 ft room with an 18-inch border, the ideal rug would be 9 × 12 ft (270 × 360 cm). This leaves approximately 18 inches of bare floor on each short side and 18 inches on each long side, which is within the recommended 18–24-inch framing range. If your furniture grouping is smaller than the room, you could use an 8 × 10 ft rug centered under the seating area.
How big should a rug be under a dining table?
The rug must extend at least 60 cm (24 inches) beyond each edge of the dining table so that chairs remain on the rug when pulled out. For a standard 90 × 180 cm (36 × 72 in) dining table, a minimum rug size of 210 × 300 cm (7 × 10 ft) is needed. For comfortable seating on all sides, 240 × 300 cm (8 × 10 ft) is ideal. Round tables work well on round or square rugs of similar diameter plus at least 60 cm.
Should all furniture legs be on the rug?
For a formal, high-end look, having all four legs of every piece on the rug is ideal. The most popular practical approach is the "front legs on" arrangement — the front two legs of the sofa and chairs sit on the rug, which visually connects the furniture to the rug without requiring an extremely large size. Both approaches look intentional and well-designed; the "all legs off" floating rug look is generally only recommended in very large rooms.
What size rug do I need for a king-size bed?
For a king bed (approximately 193 × 203 cm / 76 × 80 in), a 270 × 360 cm (9 × 12 ft) rug works well when placed with the rug extending from the foot of the bed to under the nightstands and about 60 cm (24 in) of rug visible on both sides of the bed. An 8 × 10 ft rug also works if placed just under the lower two-thirds of the bed with the rug extending on the sides where you step out.
What is the right size runner for a hallway?
A hallway runner should be 60–90 cm (24–36 in) wide, leaving at least 10 cm of bare floor on each side for visual framing. The runner length should cover approximately 2/3 of the hallway's length, centered, or run nearly the full length leaving 15–30 cm clear at each doorway threshold. Standard runner lengths are 1.8 m, 2.4 m, 3.0 m, and 3.7 m (6 ft, 8 ft, 10 ft, and 12 ft).
How do I stop a rug from sliding on hardwood floors?
A rug pad is the most effective solution. Non-slip rug pads made of rubber or natural latex grip both the floor and the rug backing, preventing movement. Size the pad approximately 2–3 cm smaller than the rug on all sides so the pad is not visible at the edges. On carpet, use a rug pad with a hook-and-loop or spike texture designed to grip carpet fibers. Double-sided rug tape is an alternative for smaller rugs that do not need a full pad.
Is it better to go bigger or smaller when a rug falls between standard sizes?
Almost always go bigger. A rug that is slightly too large can be accommodated by adjusting border widths or furniture placement. A rug that is too small creates the classic design mistake — the "island rug" that floats disconnected from the furniture. The cost difference between adjacent standard sizes is usually modest, and the visual improvement from the larger size is significant.