Area depends on shapeChoose the shape, then apply its standard area and perimeter formulas.
Geometry & measurement
Area & perimeter
Study rectangle, square, circle and triangle formulas.
LocalFree
Study & learning use only
Use the result as a learning aid and verify important calculations against your course material or instructor.
Use the result as a learning aid and verify important calculations against your course material or instructor.
Rectangle: A=length, B=width · Square: A=side · Circle: A=radius · Triangle: A, B and C are the three side lengths; area uses Heron’s formula.
This tool runs on your device in the browser.
Instructions and limitations
TOOL GUIDE
What this tool is for
Area & perimeter — Study rectangle, square, circle and triangle formulas.
Useful for practice, understanding the method, and checking homework steps where outside tools are allowed.
Common uses
- Practice a formula or method
- Check your working
- Review before a lesson or exam
Study and learning use only
Use the result for practice and understanding, not as a guaranteed answer. Verify important calculations and follow your school, university, and academic-integrity rules.
EXPLANATION & EXAMPLE
Understand the result—not just the number
Use the starting values, then change one input to see its effect.After calculating, the tool shows the values used and the working so you can check it.