Area & perimeter calculator

Calculate area, perimeter, circumference, and volume for common geometric shapes.

Values

Rectangle: l × w. Triangle: ½bh. Circle: πr². Trapezoid: ½(a+b)h. Parallelogram: bh.

Area is measured in square units: cm², m², ft², in². If dimensions are in meters, area is in m².

Break into simpler shapes, calculate each area, then add (or subtract for holes).