Flat shapes, clear formulas
Use actual measurements and split irregular spaces into simple shapes. Add areas that do not overlap and subtract holes or cutouts. These tools model flat surfaces, not curved terrain or a legal property survey.
Free area calculators
Measure your space. Understand your area.
Find the area of common shapes, see the formula, and convert between square meters, square feet, acres and hectares. Free tools for homework, rooms and outdoor projects.
Rectangle & Square Area Calculator
Calculate a rectangle or square from length and width, with perimeter and area conversions.
Open calculator →Circle Area Calculator
Calculate circle area and circumference from its radius, then convert the result.
Open calculator →Triangle Area Calculator
Find triangle area using a base and its perpendicular height.
Open calculator →Trapezoid Area Calculator
Calculate trapezoid area from two parallel sides and their perpendicular separation.
Open calculator →Ellipse Area Calculator
Calculate ellipse area from two semi-axes, with an approximate perimeter.
Open calculator →Parallelogram Area Calculator
Calculate parallelogram area using base and perpendicular height.
Open calculator →Area Unit Converter
Convert square meters, square feet, acres, hectares and other square units.
Open calculator →Length unit
Use the same length unit for all dimensions. Height is perpendicular to the base.
Show the math
Calculated locally; rounded only for display.
On your device
Inputs and unit choices stay in this browser. No account needed.