Square Footage Calculator
Calculate area for any room shape in seconds. Rectangles, circles, triangles, L-shapes — in ft² or m².
0.00ft²
0.00m²
Formula: L × W — 1 ft² = 0.0929 m²
How the Square Footage Calculator Works
Select your room's shape, choose your preferred unit (feet or meters), then enter the dimensions. The calculator instantly shows the area in both square feet and square meters — no manual conversion needed. For complex rooms, use the L-Shape option by splitting the floor plan into two rectangles.
Common Uses
- Flooring and tiling: Calculate how many boxes of hardwood, laminate, or tile you need. Add 10% for waste and cutting errors.
- Paint coverage: One gallon covers roughly 350–400 ft² (32–37 m²) per coat. Knowing your wall area prevents over-buying.
- Real estate comparisons: Convert between square feet (North America) and square meters (Europe, Asia) when comparing listings.
- HVAC sizing: Air conditioner and heating unit capacity is often specified per square foot. Get the right BTU rating by knowing your room size.
Frequently Asked Questions
How do I convert square feet to square meters?
Multiply square feet by 0.0929 to get square meters. For example, 200 ft² × 0.0929 = 18.58 m². This calculator does the conversion automatically in both directions — just enter your dimensions in your preferred unit.
How do I measure an L-shaped room?
Mentally divide the L-shape into two separate rectangles. Measure the length and width of each rectangle individually, then add the two areas together. Our L-Shape mode does this automatically — just enter the four measurements.
How much extra material should I buy for flooring?
A standard rule of thumb is to add 10% to your calculated area to account for cutting waste, pattern matching, and future repairs. In rooms with many angles or diagonal installations, increase that buffer to 15%. Always round up to the nearest full box when purchasing.
You might also need
Complementary tools based on what you're doing