Area Calculator

  • L-Shaped Room Area Calculator
    Calculate the area of an L-shaped room by splitting it into two rectangles. Enter four dimensions to get total square footage or square meters instantly.
  • Hectares to Acres Converter
    Convert hectares to acres instantly. Enter any area in hectares (ha) and get the equivalent in acres (ac) using the factor 1 ha = 2.47105381 ac.
  • Furniture Paint Coverage Calculator
    Calculate how many liters of chalk or furniture paint you need based on surface area, number of coats, and paint coverage per liter.
  • Vinyl / HTV Material Calculator
    Calculate how much vinyl or heat transfer vinyl (HTV) you need for your cuts. Enter design size, quantity, roll width and waste to get length in inches and feet.
  • Paint-by-Numbers Acrylic Paint Coverage Calculator
    Estimate how much area your acrylic paint covers from mL and coverage per mL. Adjusts for multiple coats. Great for paint-by-numbers and craft projects.
  • L-Shape Area Calculator
    Calculate the area of an L-shaped room or floor by splitting it into two rectangles. Enter four dimensions to get the total square footage instantly.
  • Annulus Area & Circumference Calculator
    Calculate the area, circumference, width and diameters of an annulus (flat ring) from any two dimensions: outer/inner radius, width, or diameters.
  • Trapezoid Calculator
    Solve any trapezoid for sides, angles, height, perimeter, midsegment and area. Supports scalene, isosceles and right trapezoids with many input combos.
  • Rhombus Calculator
    Free rhombus calculator. Enter any 2 known values (side, diagonals, angles, height, perimeter or area) and instantly solve for all remaining rhombus properties.
  • Parallelogram Calculator
    Free parallelogram calculator: solve sides, angles, diagonals, height, perimeter and area from any known combination. Pick a mode, enter values, get all properties.
  • 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.
  • Annulus Calculator
    Annulus calculator: enter any two of the outer/inner radius, circumference or area and solve all ring properties — radii, circumferences, areas and annulus area.
  • 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.
  • Acres to Square Feet Converter
    Convert acres to square feet instantly. Multiply acres by 43,560 to get ft². Free area converter with a worked solution line and formula.
  • 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.
  • 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.
  • 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.
  • Circular Segment Area Calculator (from Chord Length and Height)
    Compute the area, central angle, arc length and radius of a circular segment from its chord length c and height (sagitta) h. Free, fast and precise.
  • Circular Segment Area Calculator (from Radius and Height)
    Compute the area of a circular segment from radius r and segment height h (sagitta). Also returns central angle, arc length, and chord length.
  • Square Feet of a Rectangle Calculator
    Calculate the area in square feet of a rectangle from its length and width, with instant conversions to square yards and square meters.
  • Scalene Triangle Area Calculator
    Find the area of a scalene triangle from its three sides using Heron's formula. Enter sides a, b and c to get area, perimeter and semi-perimeter instantly.

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