Triangle area from base×height÷2 or Heron’s formula on three sides.
How to use
- Pick base/height vs three sides.
- Enter lengths that form a valid triangle.
Example
Base 10, height 5 → area 25.
Sides 3, 4, 5 → area 6.
Frequently asked questions
When use Heron?
Use Heron when you know three sides but not the height.
Base and height mode?
Base and height must be perpendicular—height is the altitude to that base.
Can any three numbers work?
No—the sum of any two sides must exceed the third.
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.