Percentage
MathAnswer the three percentage questions people ask most, with the right inputs for each one.
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Inputs
Question mode and two values
Output
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MathUpdated · Aug 2026
Area Calculator
Calculate the area of common 2D shapes and see the applicable perimeter or circumference.
Start with your numbers
Area Calculator
Change the inputs that matter to your decision. Optional assumptions stay collapsed until you need them.
Choose a shape
The required dimensions change with the shape, so you only see the fields you need.
Dimensions
Area answer
Area
100.00 units²
100.00 square units of area
Perimeter / circumference40.00 units
FormulaA = s²
Shapesquare
A = 10² = 100
All four sides are equal and all angles are 90°.
Perimeter for triangles, trapezoids, and parallelograms needs additional side lengths.
/ 01 · FAQ
Frequently asked questions
Practical notes about the inputs, assumptions, and result.
Yes. Choose Triangle and enter the base and perpendicular height. The result uses one-half times base times height.
It shows perimeter or circumference when the selected dimensions define it. Triangle, trapezoid, and parallelogram perimeter needs additional side lengths.
/ 02 · RELATED
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