Area Calculator
Precision geometric calculations for your professional and personal projects.
Square Metres
0 m²
Square Feet
0 ft²
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What Is the Area Calculator?
Whether you are buying land, installing flooring, painting walls, or planning a garden, calculating area is a fundamental measurement task. Our Area Calculator computes the area of common shapes including rectangles, triangles, circles, and trapezoids.
Accurate area calculation is essential for material estimation, cost comparison, and space planning. An incorrect measurement can lead to buying too much or too little material, both of which waste time and money.
Homeowners, contractors, real estate professionals, students, and DIY enthusiasts will find this area calculator useful for a wide range of practical applications.
How to Use This Calculator
Step 1
Select the shape you want to calculate the area for: rectangle, square, triangle, circle, or trapezoid.
Step 2
Enter the required dimensions based on the selected shape.
Step 3
Select the unit of measurement (feet, meters, inches, centimeters, etc.).
Step 4
The calculator shows the area in the selected unit and also in alternative units.
Step 5
For irregular spaces, break the area into standard shapes and add the results.
Real-World Example
Room Section 1
20ft x 15ft = 300 sq ft
Room Section 2
10ft x 12ft = 120 sq ft
Total Area
420 sq ft
Add 10% Waste
462 sq ft
Material Cost @85/sqft
39,270
Area Formulas by Shape
Area calculation depends on the shape. Rectangle: length × width. Triangle: ½ × base × height. Circle: π × radius². Trapezoid: ½ × (base1 + base2) × height.
Frequently Asked Questions
Break the irregular shape into smaller standard shapes (rectangles, triangles, circles). Calculate each area and add them together.
Yes, always add 10% to 15% extra for waste, cuts, and mistakes. For diagonal installations add 15% to 20%.
1 square meter equals approximately 10.764 square feet. The calculator automatically provides results in alternative units.
For sloping ceilings, calculate the floor area as a rectangle and the wall area separately. For the sloping portion, measure the height at the highest and lowest points, take the average, and multiply by the width.
Carpet area is the actual usable floor area within walls. Built-up area includes wall thickness. Super built-up area includes common areas like staircases and lobbies. Indian real estate typically quotes super built-up area, which can be 20-30% more than carpet area.
Carpet area is typically 70-80% of super built-up area. For a 1,200 sq ft apartment, carpet area would be approximately 840-960 sq ft. RERA mandates that builders disclose carpet area explicitly in the sale agreement, and all calculations should use this legally defined area.
Divide the plot into regular shapes (triangles and rectangles), calculate each area, and sum them. For surveying accuracy, use the trapezoidal method along a baseline. Indian land records from the Sub-Registrar office mention plot dimensions that can be verified using this approach before purchase.
Calculate total wall area = perimeter × height. Subtract doors (standard Indian door: 7ft × 3ft = 21 sq ft) and windows (4ft × 4ft = 16 sq ft). For a 12ft × 12ft room with 10ft ceiling, wall area is 480 sq ft minus 53 sq ft for standard openings = 427 sq ft of paintable area.
A 1 kW solar system requires approximately 100-130 sq ft of shadow-free rooftop. For a 5 kW system, you need 500-650 sq ft. Indian residential solar installations typically range from 1-10 kW. Check your state's net metering policy and MNRE guidelines before installing.
1 sq m = 10.764 sq ft. Most Indian residential listings use square feet, while larger land parcels use square meters or acres. A 1,000 sq ft apartment is approximately 92.9 sq m. Always verify the unit in property documents since some builders may switch between units confusingly.
Key Takeaways
Accurate area calculation prevents material waste and cost overruns.
Break irregular spaces into standard shapes for accurate total area.
Always add 10% to 15% extra material for waste and cuts.
Area calculation is essential for flooring, painting, landscaping, and construction.
The calculator handles multiple shape types and unit conversions automatically.
Why This Matters
Incorrect area calculations cost homeowners and contractors thousands in wasted materials or expensive reorders. This tool eliminates guesswork.
This calculator is for educational and planning purposes. Consult a qualified professional for personalized advice.