Rex says
The fast lane for the math you almost remember from school. Type the numbers, get the answer, move on with your day.
Try a scenario
Click to load — tweak from there.Inputs
Result
Area
15.0000
Psst — share this and help Rex grow
One click, a permanent link with your numbers baked in.
How to use this
- 1Enter shape.
- 2Enter dimension 1 (w / base / radius).
- 3Enter dimension 2 (h / height, ignored for circle).
- 4Read your area on the right — it updates as you type.
- 5Hit Share to keep the scenario or send it to someone.
About this calculator
Compute area for the most common shapes — pick one and enter dimensions.