Area Calculator
Calculate area of rectangle, circle, triangle, and room layouts for construction and renovation.
Area Calculator
Dimensions
Rectangle, circle, or triangle
Calculated Area
Smart Insights
Personalized takeaways from your numbers.
Real-Life Examples
12 × 15 ft
Circle r=6 ft
The Formula Behind It
Rectangle: l×w | Circle: πr² | Triangle: ½bhVariables
- Rectangle: l×w
- Circle: πr²
- Triangle: ½bh
How It Works
- Select shape — rectangle, circle, or triangle.
- Enter dimensions in feet or meters.
- View area in square feet and square meters.
- Use the waste factor tip for material ordering.
About Area Calculator
The Area Calculator computes surface area for rectangles, circles, and triangles — the most common shapes in construction, flooring, landscaping, and interior design. Enter dimensions in feet or meters and get instant results in both square feet and square meters.
Area Formulas
Rectangle: Area = length × width. Circle: Area = π × radius². Triangle: Area = ½ × base × height. For irregular rooms, divide the space into rectangles and sum the areas.
Material Estimation Tips
When ordering flooring, tile, carpet, or paint, add a 5–10% waste factor for cuts, pattern matching, and mistakes. Complex layouts with many angles may need 15% extra. Always verify measurements on-site before purchasing materials.
Unit Conversions
1 square foot = 0.0929 square meters. 1 square meter = 10.7639 square feet. Our calculator shows both automatically regardless of which unit you enter dimensions in.
Frequently Asked Questions
How do I calculate square footage?
For a rectangle, multiply length × width. For irregular rooms, break into rectangles and sum.
How do I find the area of a circle?
Area = π × radius². Enter radius or diameter in the calculator.
What units are supported?
Enter dimensions in feet, meters, or any unit — results use the same unit squared.
How do I calculate triangle area?
Area = ½ × base × height for a standard triangle.
Can I estimate flooring materials?
Use the area result and add 5–10% waste factor for cuts and pattern matching.
How do I convert sq ft to sq m?
Multiply square feet by 0.0929 to get square meters.
Does this include wall area?
This calculates floor/flat surface area. For paint on walls, calculate each wall separately.
What about pitched roofs?
Use the footprint area and adjust with roof pitch factor separately.
Is land area supported?
Yes. Enter plot length and width or radius for circular sections.
How accurate are construction estimates?
Always verify on-site measurements. This tool provides mathematical area from your inputs.