Area Calculator
Free area calculator. Calculate area of squares, rectangles, circles, triangles, and shapes.
A = length × width
Area Formulas Reference
Rectangle: A = l × w
Square: A = s²
Triangle: A = ½bh
Circle: A = πr²
Trapezoid: A = ½(a+b)h
Parallelogram: A = bh
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Last updated: January 2026
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Frequently Asked Questions
How do I calculate the area of a rectangle?
Multiply the length by the width. For example, a rectangle 5 meters long and 3 meters wide has an area of 5 × 3 = 15 square meters.
What is the formula for the area of a circle?
The area of a circle is π × r², where r is the radius. For a circle with radius 4 cm, the area is π × 4² = π × 16 ≈ 50.27 square centimeters.
How do I find the area of a triangle?
Use the formula A = ½ × base × height. A triangle with a 10 cm base and 6 cm height has an area of ½ × 10 × 6 = 30 square centimeters.
What's the difference between area and perimeter?
Area measures the space inside a shape (in square units), while perimeter measures the total length around the shape (in linear units). A 4×3 rectangle has area 12 sq units and perimeter 14 units.
How do I convert between square feet and square meters?
Multiply square feet by 0.0929 to get square meters, or multiply square meters by 10.764 to get square feet. For example, 100 sq ft ≈ 9.29 sq m.