How It Works
Rectangle: ab. Triangle: ab/2. Circle: πa². Ellipse: πab. Trapezoid: (a+c)b/2. Ellipse inputs are semi-axes, not diameters.
Reference Sources
FAQs
How does this calculator work?
Rectangle: ab. Triangle: ab/2. Circle: πa². Ellipse: πab. Trapezoid: (a+c)b/2. Ellipse inputs are semi-axes, not diameters.
What assumptions should I check?
Check the units and definitions shown beside each input. Results use the values you enter.