Geometry & Stats
Area and perimeter of a regular octagon.
Last 10 computations for this calculator — click any row to restore.
No history yet — change a field above and your last 10 runs will appear here.
Customise the iframe and copy the snippet to drop this calculator into your own page.
The iframe loads our page and renders the calculator in an isolated context — no scripts run in your page.
Square Area & Perimeter
Area and perimeter of a square.
Rectangle Area
Area and perimeter of a rectangle.
Triangle Area
Area via ½bh or Heron's formula, plus perimeter.