Geometry Calculator
Your entries are calculated in this browser and are not saved by this tool.
How the Geometry Calculator works
Calculate common two-dimensional area and perimeter measurements. Enter the requested values in the tool above, select Calculate, and review both the main result and its breakdown.
Formula used
Circle uses πr². Rectangle uses length×width. Triangle uses Heron’s formula. Trapezoid uses (a+b)÷2×height.
Worked example
A 3-4-5 triangle has area 6 square units.
Practical uses
- Find area and perimeter
- Check triangle dimensions
- Compare common shapes
Assumptions and limits
Results depend on the supplied values and displayed rounding. For reproducibility, record the inputs and assumptions used when sharing a result.
Frequently asked questions
Is this calculator free?
Yes. It can be used without creating an account.
Are the values I enter stored?
The calculation runs in your browser. The core tool does not submit your calculator entries to WordPress.
Can I rely on the result for a major decision?
Use it as an educational estimate, verify important inputs, and seek qualified advice when the decision carries financial, medical, tax or legal consequences.