Area Calculator
Calculate the area of common 2D shapes
Circle — Inputs
A = π × r²
Result
Enter valid dimensions to calculate area
Formulas Reference
Circle
A = π × r²
Rectangle
A = width × height
Triangle
A = ½ × base × height
Trapezoid
A = ½ × (a + b) × height
Parallelogram
A = base × height
Ellipse
A = π × a × b
Sector
A = (θ / 360) × π × r²
Regular Polygon
A = (n × s²) / (4 × tan(π/n))