Area of a rectangle, triangle, or circle—pick a shape and enter its dimensions.
How to use
- Choose shape.
- Rectangle: length & width; triangle: base & height; circle: radius in the first field.
Example
6×4 rectangle → area 24.
Radius 3 circle → area ≈ 28.27.
3D: volume calculator.
Frequently asked questions
Circle mode input?
Circle mode: radius in the first field; second is ignored.
Rectangle area?
Area = length × width—both positive.
Same as triangle calculator?
Triangle here is base×height; three sides only → use the triangle calculator (Heron).
Can I save my inputs?
Yes. Copy link below the form keeps your current inputs so you can share the scenario or save it for later.