Calculate the area of any common 2D shape by entering its dimensions.
Select your shape, enter the required measurements (all in the same unit), and click Calculate. Area is returned in square units. For a circle, enter the radius (not diameter). For a triangle, enter the base and the perpendicular height. For a trapezoid, enter both parallel sides and the height between them.
Results from this calculator are estimates based on standard Euclidean geometry area formulas and are provided for general informational purposes. Rounding, regional standards and manufacturer variations can cause small differences from official or brand-specific figures.
For decisions where precision is critical — engineering, construction or legal contexts — verify results with a qualified professional or an official reference source.
This calculator uses standard Euclidean geometry area formulas. The underlying logic was built and manually cross-checked against independent reference calculators and textbook worked examples across dozens of test cases before publication.
Every formula on elCalculador is reviewed by our editorial team for mathematical accuracy, and pages are re-audited whenever a calculator's logic or inputs are updated.