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Room Size Calculator
Enter your room length and width to get the exact area in square feet and square meters. The calculator also shows the room perimeter and how much flooring to buy.
Find the Size of Your Room
Measure wall to wall, type the numbers, and get your room size in seconds.
YOUR ROOM
In square metersHandy for listings and metric plans
Flooring to buy (+10% extra)Covers cuts, corners and waste
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How It Works
Step 1: Measure your roomMeasure the longest wall for length and the shorter wall for width, in feet. Measure wall to wall, skirting to skirting.
Step 2: Type the numbersEnter the length and width in the boxes above. Half feet are fine, for example 10.5.
Step 3: Get your room sizeThe calculator shows your area in square feet and square meters, the perimeter, and the flooring amount to buy.
Formula Used in This Calculator
Room size is simple math. This calculator uses these formulas:
Room area = Length x Width Perimeter = 2 x (Length + Width) Square meters = Square feet x 0.0929 Flooring to buy = Room area x 1.10 (10 percent extra for cuts) For an L-shaped room, split it into two rectangles, work out each area, and add them together.Related Tools
Room Size Chart (Quick Guide)
| Room size | Area | Size feel |
|---|---|---|
| 10 x 10 ft | 100 sq ft | Small: cozy bedroom or office |
| 10 x 12 ft | 120 sq ft | Small to medium bedroom |
| 12 x 12 ft | 144 sq ft | Medium: standard bedroom |
| 12 x 15 ft | 180 sq ft | Medium to large living room |
| 15 x 20 ft | 300 sq ft | Large: open plan living |
3 Measuring Rules That Keep You Accurate
- Measure twice: measure each wall two times and use the smaller number for a snug fit.
- Include alcoves: add nooks, bay windows and closets as their own small rectangles.
- Round up for flooring: always buy about 10 percent extra for cuts and mistakes.
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Room Size Calculator FAQs
How do I calculate the size of a room?Multiply the length by the width. A room that is 12 ft long and 10 ft wide is 120 sq ft.
What is a good size for a bedroom?About 120 to 150 sq ft fits a queen bed, two nightstands and a dresser in comfort. Under 100 sq ft works best with compact furniture.
How do I measure an L-shaped room?Split the room into two rectangles, calculate each area on its own, then add the two numbers together.
How many square meters is 120 sq ft?About 11.1 square meters. Multiply square feet by 0.0929 to convert, this calculator does it for you.
What Our Readers Say
★★★★★
Needed my exact room size for a flooring quote. Typed two numbers and had it in seconds, square meters included.
Ben C., Denver
★★★★★
The flooring plus 10 percent tip saved my order. The store tried to sell me way more than I needed.
Sofia L., San Diego
★★★★★
Used it while apartment hunting to compare room sizes fairly. Every listing makes sense now.
James K., Toronto
★★★★★
Simple, fast and the little room diagram makes the size easy to picture.
Ava R., London
★★★★★
Measured my L-shaped studio in two parts like the guide says. Perfect match with my floor plan.
Liam O., Dublin
★★★★★
Great before buying a rug. I checked my room size here, then used the rug calculator next door.
Mia T., Sydney
Still Not Sure? Ask Us
Send us your room size and a photo of your space, and we will help you plan the layout for free.
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