Area Calculator
Calculate the area of rectangles, circles and triangles.
How to Use the Area Calculator
Select a shape and enter the required dimensions to calculate its area.
Practical Example
A rectangle 8 m long and 5 m wide has an area of 40 m².
Factors That Affect the Result
Use consistent units and the correct dimensions for the selected shape. Rounded measurements will produce rounded area estimates.
Frequently Asked Questions
Can I use different units?
Yes, but dimensions should use compatible units.
Does the calculator include irregular shapes?
Only the shapes provided by the tool.
What unit is the result?
The area is expressed in squared units.
Related Tools
- Volume Calculator
- Triangle Calculator
- Pythagorean Theorem Calculator
- Distance Formula Calculator
- Unit Converter
Area Calculation Tips
Choose the shape that best matches the space and enter all required dimensions using the same unit. Area is expressed in square units, so converting a length unit after the calculation is not the same as converting the original dimensions first. For irregular spaces, divide the layout into simpler rectangles, triangles or circles, calculate each section and combine the results. Measure carefully and round only the final value when accuracy matters. This approach is useful for flooring, paint, landscaping, construction and geometry problems.