Area Calculator

  • Stadium (Geometry) Area and Perimeter Calculator
    Solve a geometric stadium shape: find radius, side length, perimeter and area from any two known values. P = 2a + 2pi*r, A = 2ar + pi*r^2.
  • Square Calculator
    Free square calculator: enter any one of side, diagonal, perimeter, or area and instantly get the other three. Pick units and significant figures.
  • Square Meters to Square Feet Converter
    Convert square meters to square feet instantly. Enter an area in m2 and get the exact ft2 value using the factor 10.7639104, with worked steps shown.
  • Square Feet to Square Meters Converter
    Convert square feet (ft²) to square meters (m²) instantly using the exact factor 0.09290304. See the conversion ratio and step-by-step working.
  • Paint Coverage and Cost Calculator
    Estimate paint needed for a wall, room, ceiling, or trim in gallons or liters, subtract doors and windows, and calculate total paint cost.
  • Paint Calculator
    Free paint calculator: enter wall area, doors/windows, coats and coverage to find how many gallons of paint you need for any room.
  • Trapezoid Missing Side and Area Calculator (from Three Sides and Height)
    Find a trapezoid's missing base or slant leg and its area from three sides and the height. Two modes: solve for a base or for a slant leg.
  • Trapezoid Height and Area from Four Sides
    Find the perpendicular height and area of a trapezoid from its four side lengths (two parallel sides and two legs). Pure geometry, works in any unit.
  • Building Coverage Ratio (Kenpeiritsu) Calculator
    Calculate the building coverage ratio (kenpeiritsu), a Japan zoning measure: building footprint divided by site area, as a percent. Rounded up to 2 decimals.
  • Circle Area Calculator
    Calculate the area of a circle quickly and accurately with this Circle Area Calculator. Simply input the radius to determine the precise area of any circular shape.
  • Total Square Footage Calculator (Multiple Rooms)
    Add up the square footage of multiple rooms at once. Enter each room's length and width to get total square feet, square yards, and square meters.
  • Triangle Area Calculator
    Calculate triangle area easily with base and height inputs. Get accurate results for your geometry problems and mathematical calculations with this simple and efficient triangle area calculator.
  • Ellipse Area Calculator
    Ellipse Area Calculator - Calculate the area, perimeter, and eccentricity of an ellipse easily. Enter the lengths of the semi-major and semi-minor axes to get precise results instantly.
  • Sphere Surface Area Calculator
    Compute the surface area of a sphere from its radius. Enter a radius to get A = 4πr² with instant results in square units.
  • Square Area Calculator
    Enter the side length to instantly calculate a square’s area (A = a²). Fast, clear results for geometry, homework, and quick checks.
  • Pyramid Lateral Surface Area Calculator
    Calculate pyramid lateral surface area with length, width, and height inputs. Get accurate results for triangular faces of pyramids using this efficient online tool.
  • Pyramid Surface Area Calculator
    Calculate the surface area of a pyramid with this easy-to-use Pyramid Surface Area Calculator. Input length, width, and height to get accurate results instantly.
  • Cone Lateral Surface Area Calculator
    Calculate cone lateral surface area easily with this free online tool. Input radius and height to instantly determine the lateral surface area of a cone. Accurate results for geometry problems.
  • Cone Base Area Calculator
    Enter the radius to instantly calculate a cone’s circular base area using A = πr². Simple, accurate results for geometry, study, and design.
  • Triangular Prism Surface Area Calculator
    Calculate the surface area of a triangular prism with this triangular prism surface area calculator. Input triangle base, height, and prism length for accurate results. Simplify geometry calculations instantly.
  • Lot Size to Acres Calculator
    Convert lot size in square feet to acres instantly. Enter your lot's square footage and get the acreage using the 43,560 sq ft per acre standard.
  • Cylinder Area Calculator
    Calculate cylinder area easily with radius (r) and height (h) inputs. Find surface area and volume for cylinders of any size with this accurate cylinder area calculator.
  • Lot Size to Square Feet Calculator
    Convert a rectangular lot's length and width in feet into total square feet (and acres) instantly. Free, accurate lot size area calculator.
  • Square Feet to Acres Calculator
    Convert square feet to acres instantly. Enter any area in sq ft and get the exact acreage using the standard 43,560 sq ft per acre factor.

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