Area Calculator accuracy and testing

Formula source

• Each supported shape uses a specific formula: * **Rectangle/Parallelogram:** $Width \times Height$ * **Trapezoid:** $\frac{(Base1 + Base2)}{2} \times Height$ * **Ellipse:** $\pi \times a \times b$ using the semimajor and semiminor radii * **Sector:** $\frac{1}{2} \times r^2 \times \theta$

Test cases

Known limitations

• This page documents the checked-in calculator logic and does not certify results for every real-world edge case.
• Use the result as a planning estimate unless the calculator page states a stricter purpose.

Assumptions

• All measurements are entered in the same linear unit, so the result is returned in matching square units.
• Dimensions are treated as non-negative geometric lengths or angles.
• Ellipse mode expects semimajor and semiminor axis lengths, not full major and minor axis lengths.
• Sector angles are interpreted in degrees and converted internally before the area is calculated.

Unit handling

• Shape accepts one of the configured options.
• Dimension 1 accepts numeric values.
• Dimension 2 accepts numeric values.
• Dimension 3 accepts numeric values.

Rounding rules

• Number displays use up to 2 decimal places in the calculator UI.

Version history

Change log