How to Use the Rug Size Calculator
Rugs are the perfect way to add style, warmth, and comfort to any room. Our rug size calculator helps you find the ideal rug dimensions for your space based on the rug shape, room size, and how much bare floor you want to show around the rug. You can also estimate the total cost of a custom rug.
Step-by-Step Guide
- Choose Rug Style — Select the shape: Rectangle, Square, Runner, Circle, Oval, or Octagon.
- Select Unit System — American (feet) or Metric (meters).
- Enter Room Dimensions — Provide the width and length of the area where you'll place the rug.
- Bare Floor Perimeter — Enter how much floor to leave uncovered around the rug (default: 1.5 ft / 0.46 m per dimension, leaving ~0.75 ft / 0.23 m on each side).
- Add Extrusion (optional) — If an object against the wall (fireplace, cupboard) reduces usable floor space, enter its dimensions.
- Enter Price (optional) — Add a price per square foot or square meter to estimate the total rug cost.
- Click "Calculate Rug Size" — Get your custom rug dimensions, area, rug pad size, and nearest standard rug size.
Rug Shapes Explained
- Rectangle — The most common shape. Calculated directly from room dimensions minus the bare floor perimeter.
- Square — Uses the shorter room dimension to form a perfect square rug.
- Runner — A long, narrow rug typically used in hallways and kitchens. Set your preferred runner width (standard: 2–3 ft / 0.6–0.9 m).
- Circle — Diameter equals the available width. Area = π × (diameter/2)².
- Oval — Uses both width and length. Area = π × (W/2) × (L/2).
- Octagon — Based on the shorter available dimension. Area = (W × 0.4142)² × 4.8284.
Formulas Used
The base formula for calculating the rug dimensions:
- W(rug) = W(room) − W(extrusion) − Bare Floor
- L(rug) = L(room) − L(extrusion) − Bare Floor
- Area(rug) = W(rug) × L(rug) (for rectangle/square/runner)
How to Calculate Rug Pad Size
A rug pad keeps your rug from slipping and protects your flooring. To calculate the rug pad size, subtract 1 inch (2.5 cm) from all four sides of your rug:
- Pad Width = Rug Width − 2 inches (5 cm total — 1 inch each side)
- Pad Length = Rug Length − 2 inches (5 cm total — 1 inch each side)
Standard Rug Sizes
Our calculator automatically finds the nearest standard rug size to your custom dimensions. Common standard sizes (in feet):
| Size (ft) | Best Use |
|---|---|
| 2 × 3 | Entryway, small bathroom |
| 3 × 5 | Entryway, small bedroom |
| 4 × 6 | Small living room, nursery |
| 5 × 7 / 5 × 8 | Medium bedroom, dining room |
| 6 × 9 | Medium living room, bedroom |
| 7 × 10 | Large bedroom, living room |
| 8 × 10 / 8 × 11 | Large living room |
| 9 × 12 | Extra-large living room |
| 10 × 14 | Grand living room, open floor plan |
| 12 × 15 | Very large rooms |
Rug Size Tips by Room
- Living Room — All furniture legs on the rug, or at least the front legs. Leave 12–18 inches (30–45 cm) of bare floor on each side.
- Bedroom — Place the rug under the bottom two-thirds of the bed, extending out 18–24 inches (45–60 cm) on the sides.
- Dining Room — The rug should extend at least 24 inches (60 cm) beyond the table on all sides so chairs remain on the rug when pulled out.
- Hallway — Use a runner rug. Standard widths are 2–3 ft (0.6–0.9 m).
Frequently Asked Questions
- What is the most popular rug size?
- The most popular sizes are 8×10 ft and 9×12 ft for living rooms, and 5×8 ft for bedrooms.
- How much floor should be visible around a rug?
- A common rule is to leave 12–24 inches (30–60 cm) of bare floor showing around the perimeter of the rug. Our calculator defaults to 1.5 ft (18 inches) per dimension.
- Do I need a rug pad?
- Yes! A rug pad prevents slipping, protects your flooring, adds cushioning underfoot, and extends the life of your rug. Choose a pad 1–2 inches (2.5–5 cm) smaller than your rug on all sides.
- Can I get a custom rug size?
- Yes, many rug manufacturers offer custom sizes. Use our calculator to find your exact dimensions, then decide whether to go custom or choose the nearest standard size.