Rug Size Calculator
Compare candidate rug dimensions with a measured room before choosing a layout.
How the result changes
Only rug length changes; all other inputs stay at your current values. The line illustrates the formula across the shown range. This is not a forecast of real-world outcomes.
About this calculation
Rug Size Calculator calculates rug area from room length, room width, rug length, rug width. Compare candidate rug dimensions with a measured room before choosing a layout. The main answer uses sq ft and follows the specific assumptions explained below.
Formula
Rug area = rug length × rug width; room coverage = rug area ÷ room area × 100%.
Worked example
With Room length: 15 ft, Room width: 12 ft, Rug length: 10 ft, Rug width: 8 ft, rug area is 80 sq ft.
Inputs and calculation
Treat both the room and rug as rectangles measured in feet. Multiply the two rug dimensions for square feet, then divide by the room's corresponding area to calculate a size comparison. The displayed relationship is Rug area = rug length × rug width; room coverage = rug area ÷ room area × 100%. Keep the fields' displayed units attached when reproducing this relationship by hand.
Worked numerical example
For example, enter room length 15 ft, room width 12 ft, rug length 10 ft, rug width 8 ft. Those inputs produce rug area of 80 sq ft. The same values also give share of room area 44.4444 %.
Holding the other example values fixed, change room length from 15 to 16.5 ft. The main output becomes 80 sq ft. This comparison isolates the effect of that one input.
How to read and use the result
The coverage percentage compares total surface areas; it does not say that the rug physically fits the room or clears furniture and doors. Check each side dimension separately. Compare candidate rug dimensions with a measured room before choosing a layout.
Practical context
An 8 by 10 foot rug covers 80 square feet in a 12 by 15 foot room of 180 square feet, or about 44.4% by area. That percentage does not tell you how the rug sits under a sofa or dining table.
Assumptions and scope
The room is rectangular and unobstructed for this geometric comparison. Alcoves, furniture footprints, door swing and intentionally exposed floor borders are not represented. Replace the example defaults with measured inputs for your situation and account separately for factors outside these fields.
Checks and common mistakes
A rug can have smaller area than a room yet still be too long on one side. Measure usable floor space and verify the rug's orientation before purchase.
Common questions
What should I verify before using the Rug Size Calculator result?
A living room may look better when at least the front legs of seating rest on the rug, while a dining rug must accommodate chairs pulled back from the table. Mark the proposed edges on the floor with tape and test doors before ordering.
Inputs
- Room length (ft)
- Room width (ft)
- Rug length (ft)
- Rug width (ft)