Free Online Area and Perimeter Calculator 2026
Need to calculate the area or perimeter of a geometric shape? Our calculator handles the 5 most common shapes: rectangle, square, triangle, circle, and trapezoid. Perfect for students, teachers, engineers, architects, and construction professionals.
Simply select the shape, enter the dimensions, and the calculator instantly shows the results in square meters (m²) and meters (m).
Area and Perimeter Calculator
Calculate the area and perimeter of flat geometric shapes
Available Shapes
- Rectangle: Area = base × height | Perimeter = 2 × (base + height)
- Square: Area = side² | Perimeter = 4 × side
- Triangle: Area = (base × height) ÷ 2 | Perimeter = sum of all sides
- Circle: Area = π × radius² | Perimeter = 2 × π × radius
- Trapezoid: Area = ((B + b) × height) ÷ 2 | Perimeter = sum of all sides
Practical Applications
- Construction: Calculate square meters of flooring, walls, or roofing
- Painting: Estimate paint needed based on wall area
- Landscaping: Measure land area for planting
- School: Solve geometry exercises
- Architecture: Plan room layouts and distributions