Area Calculator
Square: area = side²; Rectangle: area = length×width; Circle: area = π×r²; Triangle: area = base×height÷25×3=15
Free online tool
Area Calculator
Select a shape and enter its dimensions to calculate the area.
Instant calculation
Area Calculator
Select a shape and enter its dimensions to calculate the area.
Your result
Calculation
Your numbers stay in this browser. Nothing is uploaded or saved.
Three clear steps
How to use this calculator
- 01
Select shape
Choose your shape type using the shape selector.
- 02
Enter dimensions
Type the required dimensions for your shape.
- 03
See area
Calculate to see the area in square units.
The formula
How this calculation works
Choose your shape and enter the relevant dimensions. Results are in square units.
Check the method
Worked examples
Each example follows the same formula used by the calculator.
Area of a rectangle 5 by 3?
5×3=1515 square unitsArea of a circle radius 5?
π×5²=π×25≈78.54≈ 78.54 square unitsCommon questions
Questions about this calculation
What is the Area Calculator?
The Area Calculator helps you calculate the area of common geometric shapes. Enter your values and select Calculate to get an instant result.
How is the result calculated?
Choose your shape and enter the relevant dimensions. Results are in square units.
Can you show an example?
Example: Area of a rectangle 5 by 3? — 15 square units.
Is my data saved when I use the Area Calculator?
No. All calculations run locally in your browser. Your inputs and results are never uploaded, stored or shared with anyone.
Is the Area Calculator free to use?
Yes. The Area Calculator is completely free. No account, sign-up or payment is required. It works on mobile, tablet and desktop.
Continue calculating