Area Calculators
Browse our comprehensive collection of area calculators for squares, rectangles, triangles, circles, trapezoids, polygons, ellipses, and more. Free online tools for geometry, construction, real estate, and everyday use.
Square Area Calculator
Calculate area of a square from side length (A = s²) with step-by-step work.
quadrilateralRectangle Area Calculator
Compute area of a rectangle from length and width (A = l × w) with formula steps.
quadrilateralParallelogram Area Calculator
Calculate area of a parallelogram from base and height (A = b × h).
quadrilateralRhombus Area Calculator
Compute area of a rhombus using diagonals (A = ½ × d₁ × d₂) or side and angle.
quadrilateralTrapezoid Area Calculator
Calculate area of a trapezoid from parallel sides and height (A = ½(a+b)h).
quadrilateralKite Area Calculator
Find area of a kite using diagonals (A = ½ × d₁ × d₂) with steps.
quadrilateralGeneral Quadrilateral Area
Calculate area of any quadrilateral from sides and angles using Bretschneider's formula.
quadrilateralRectangle Diagonal & Area
Find area of a rectangle from diagonal and one side with step-by-step work.
quadrilateralTriangle Area (Base & Height)
Calculate area of a triangle from base and height (A = ½ × b × h).
triangleHeron's Formula Calculator
Compute triangle area from three side lengths using Heron's formula.
triangleRight Triangle Area
Calculate area of a right triangle from legs (A = ½ × a × b).
triangleEquilateral Triangle Area
Compute area of an equilateral triangle from side length (A = √3/4 × s²).
triangleIsosceles Triangle Area
Calculate area of an isosceles triangle from base and equal sides.
triangleTriangle Area (Two Sides & Angle)
Compute area from two sides and included angle (A = ½ × a × b × sin C).
triangleTriangle Area from Coordinates
Calculate area of a triangle from vertex coordinates using the shoelace formula.
triangleScalene Triangle Area
Find area of a scalene triangle using various methods with step-by-step.
triangleCircle Area Calculator
Calculate area of a circle from radius or diameter (A = πr²) with steps.
circleSector Area Calculator
Compute area of a circular sector from radius and central angle.
circleSegment Area Calculator
Calculate area of a circular segment from radius and central angle.
circleAnnulus (Ring) Area
Compute area of an annulus (ring) from outer and inner radii.
circleEllipse Area Calculator
Calculate area of an ellipse from semi-major and semi-minor axes (A = πab).
circleSemicircle Area Calculator
Find area of a semicircle from radius or diameter (A = ½πr²).
circleCircular Sector from Arc Length
Compute sector area from radius and arc length with formula steps.
circleCircle Area from Circumference
Calculate circle area from circumference (A = C²/4π) with work.
circleRegular Polygon Area
Calculate area of any regular polygon from side length and number of sides.
polygonHexagon Area Calculator
Compute area of a regular hexagon from side length (A = 3√3/2 × s²).
polygonPentagon Area Calculator
Calculate area of a regular pentagon from side length.
polygonOctagon Area Calculator
Find area of a regular octagon from side length or apothem.
polygonPolygon Area from Coordinates
Compute area of any polygon from vertex coordinates using the shoelace formula.
polygonIrregular Polygon Area
Calculate area of an irregular polygon using side lengths and angles.
polygonApothem to Area Calculator
Find polygon area from apothem and perimeter or side count.
polygonPolygon Area from Circumradius
Compute area of a regular polygon from circumradius and number of sides.
polygonLand Area Calculator
Calculate area of a plot of land from length and width in various units.
landIrregular Land Area
Compute area of an irregular-shaped land parcel using boundary measurements.
landAcreage Calculator
Convert square feet, square meters, or other units to acres.
landLot Area from Dimensions
Calculate area of a building lot from frontage and depth.
landFarm Field Area
Compute area of agricultural fields in acres, hectares, and square meters.
landArea from Survey Data
Calculate area from surveyor measurements using coordinates or boundary lengths.
landProperty Tax Area Estimator
Estimate property tax based on land area and local tax rates.
landRoof Area Calculator
Estimate roof area from floor area and roof pitch for roofing materials.
landComposite Shape Area
Calculate area of composite shapes by combining rectangles, triangles, and circles.
complexL-Shaped Area
Compute area of an L-shaped figure using length and width of each section.
complexT-Shaped Area
Find area of a T-shaped figure by breaking it into rectangles.
complexPlus-Shaped Area
Calculate area of a plus-shaped (cross-shaped) figure from dimensions.
complexU-Shaped Area
Compute area of a U-shaped figure using outer and inner dimensions.
complexArea of a Crescent
Calculate area of a crescent shape (lune) from two circle intersections.
complexArea of a Heart Shape
Approximate area of a heart-shaped figure using geometric decomposition.
complexArea Between Two Curves
Compute area between two functions using integration (numerical approximation).
complexPolygon Area from Coordinates
Calculate area of any polygon from vertex coordinates using the shoelace formula.
coordinateTriangle Area from Coordinates
Compute triangle area from three vertex coordinates with step-by-step work.
coordinateQuadrilateral Area from Coordinates
Find area of a quadrilateral from four vertex coordinates using shoelace formula.
coordinateCircle Area from Equation
Calculate circle area from standard or general equation (center-radius form).
coordinateArea from Distance Between Points
Compute area of a rectangle or triangle from point distances.
coordinateBounding Box Area
Calculate area of the bounding box (minimum bounding rectangle) for a set of points.
coordinateArea of a Parabola Segment
Compute area under a parabola between two x-coordinates using integration.
coordinateArea of a Triangle in 3D
Calculate area of a triangle in 3D space using cross product of vectors.
coordinateConcrete Slab Area
Calculate area of a concrete slab from length and width for material estimation.
engineeringWall Area Calculator
Compute wall area including windows and doors for painting or drywall.
engineeringFlooring Area Calculator
Calculate floor area for tile, carpet, or hardwood installation with waste factor.
engineeringPainting Area Estimator
Estimate paintable area for walls, ceilings, and trim with paint coverage.
engineeringLandscape Area Calculator
Compute garden, lawn, or landscape area from shape and dimensions.
engineeringCross-Sectional Area (Beam)
Calculate cross-sectional area of beams, columns, and structural members.
engineeringDuct Area Calculator
Compute area of rectangular or circular ducts for HVAC design.
engineeringPipe Cross-Section Area
Calculate cross-sectional area of pipes from diameter for flow calculations.
engineeringWhat Are Area Calculators?
Our Area Calculators collection provides a comprehensive suite of tools for computing the area of various 2D shapes and surfaces. Whether you're a student learning geometry, a professional in construction or real estate, or someone planning a home improvement project, these calculators deliver accurate results with clear step-by-step explanations.
From squares and rectangles to triangles, circles, polygons, ellipses, and complex composite shapes, our tools cover a wide range of area calculations for academic, professional, and everyday use.
How to Use This Directory
- Search: Type a keyword into the search bar to find specific calculators by name or description.
- Filter by Category: Use the dropdown to narrow down to a specific shape category — each option shows the number of tools available.
- Click to Use: Each calculator card links directly to the tool. Click on any card to start your area calculation instantly.
- Explore More: Check the "Explore More Math & Geometry Calculators" section for related calculators in other categories.
Why Use Our Area Calculators?
- Comprehensive: Covers quadrilaterals, triangles, circles, polygons, complex shapes, coordinate geometry, and engineering applications.
- Step-by-Step: Many calculators show the formula and calculations, helping you understand the process.
- Free & Accessible: No registration or fees — use any tool instantly on any device.
- Educational & Practical: Ideal for homework, teaching, construction planning, real estate, and daily life.
- Accurate & Reliable: Built with validated mathematical formulas and regularly tested.
❓ Area Calculators FAQ
What types of area calculators are available?
We offer calculators for squares, rectangles, parallelograms, rhombuses, trapezoids, kites, triangles (various methods), circles, sectors, segments, ellipses, regular polygons (hexagon, pentagon, octagon), complex composite shapes, land area, and engineering applications.
How do I calculate the area of a rectangle?
Use our Rectangle Area Calculator. Enter the length and width, and the tool will compute A = l × w with step-by-step work.
How do I calculate the area of a triangle?
Use our Triangle Area (Base & Height) calculator, or Heron's Formula if you have three side lengths. Enter the dimensions and the tool will compute the area.
What is the formula for the area of a circle?
The area of a circle is A = πr². Our Circle Area Calculator will compute it for you from radius or diameter.
How do I calculate the area of an irregular polygon?
Use our Polygon Area from Coordinates calculator or Irregular Polygon Area calculator. Enter vertex coordinates or side lengths and angles to compute the area.
Can I calculate land area in acres?
Yes, our Land Area Calculator and Acreage Calculator can convert square feet, square meters, or other units to acres and hectares.
Are these calculators suitable for construction and real estate?
Yes, our calculators are designed for professional use in construction, real estate, landscaping, and property management.
How accurate are the calculators?
Our calculators use precise mathematical formulas and constants (like π) to high precision, ensuring accurate results for all calculations.
How often are new calculators added?
We regularly add new calculators based on user requests. If you have a suggestion, please contact us.
Can I use these calculators for school assignments?
Absolutely! Our step-by-step solutions make them ideal for learning and checking homework.