Area Calculator
Pick a shape and enter its measurements; it instantly computes the area of a rectangle, square, triangle, circle or trapezoid.
About
Brings the area formulas for five common shapes (rectangle, square, triangle, circle, trapezoid) into one tool — for geometry homework, construction/paint estimates or everyday measurements.
Calculation happens in your browser; your data is never sent out. The result is in the square of whatever unit you enter.
How to use
- Pick a shape at the top.
- Enter the required measurements.
- See the calculated area instantly.
Area formulas
The shape area formulas this tool uses:
- Rectangle
- Area = width × height.
- Square
- Area = side × side (side²).
- Triangle
- Area = (base × height) / 2.
- Circle
- Area = π × radius² (about 3.14159 × r²).
- Trapezoid
- Area = ((base a + base b) / 2) × height.
Frequently Asked Questions
- Which unit does it use?
- It's unit-agnostic; enter cm and you get cm², enter m and you get m².
- How is circle area computed?
- It uses the formula π × radius² for circles.
Other tools
Embed this tool
Copy the code below and paste it into your site's HTML to embed this tool for free. The snippet includes an attribution link back to the source.
<iframe src="https://tooldict.com/embed/en/area-calculator" title="Area Calculator" width="100%" height="600" style="border:1px solid #e2e8f0;border-radius:16px;max-width:680px" loading="lazy"></iframe>
<p style="font:13px/1.5 sans-serif">Powered by <a href="https://tooldict.com/en/area-calculator" target="_blank" rel="noopener">Area Calculator</a> — Tooldict</p>