An ellipse’s area (also called an oval’s area) depends on two independent measurements — a semi-major axis and a semi-minor axis — unlike a circle, where the radius alone determines everything. This calculator finds the area, perimeter, eccentricity, and focal…
A regular polygon’s area — hexagon, pentagon, octagon, or any number of sides — can be found from whichever measurement you already know: side length, apothem (inradius), circumradius, perimeter, or even the area itself worked backward. This calculator handles any…
An area unit conversion comes up constantly once you’ve calculated an area: a floor plan in square feet needs to become square meters for an international contractor, a land survey in acres needs to become hectares for a metric spreadsheet,…
A sports field or court’s area is almost always a simple rectangle — length times width — but the exact dimensions differ by sport, level of play, and governing body, and a few fields aren’t rectangles at all. This calculator…
A solar panel’s area is the starting point for two very different questions: how much a single panel takes up, and how much roof or ground space an entire system needs. This calculator handles both, plus a third common question…
A boat’s sail area is the total surface of cloth driving it through the water, and it’s calculated the same way for almost every fore-and-aft rig: each sail is treated as a triangle, using a small set of standard rig…
The area model is a way of picturing a calculation as the area of a rectangle, split into smaller rectangles that are easier to work out and add back together. It shows up under a few different names — the…
A pizza’s price tag is based on its diameter, but what you actually eat is its area — and area does not grow at the same rate as diameter. This calculator finds the exact area of any round pizza from…
Rectangle Hollow Rectangle (Tube) Circle Round Tube (Pipe) Isosceles Triangle Symmetric I-Beam Length unit for your inputs: inches (in)millimeters (mm)centimeters (cm)meters (m)feet (ft) Width (b) Height (h) Outer Width (B) Outer Height (H) Wall Thickness (t) Assumes a uniform wall…
Add Sections (Length × Width) I Already Know My Total Area + Add Another Section For an irregular yard, break it into two or more rectangular sections (front lawn, side strip, back lawn, and so on) and this adds them…
