Geometry

  • TV Screen Size Calculator
    Calculate a TV or monitor's actual width, height and screen area from its diagonal size and aspect ratio (e.g. 16:9). Free, instant, accurate.
  • Rectangular Prism Volume Calculator
    Calculate the volume of a rectangular prism (cuboid) instantly with length × width × height. Also shows surface area. Free and easy to use.
  • Cubic Feet of a Rectangle (Box) Calculator
    Calculate the cubic feet (volume) of a rectangular box from its length, width and height in feet. Get instant ft³, yd³ and in³ results.
  • Square Meters of a Rectangle Calculator
    Calculate the area of a rectangle in square meters instantly. Enter length and width in meters to find m² area plus the perimeter.
  • Rectangle Aspect Ratio Calculator
    Find the aspect ratio of any rectangle from its width and height. Reduces to the simplest integer ratio (e.g. 1920×1080 = 16:9) plus a decimal ratio.
  • Gallons to Liters Converter
    Convert gallons to liters instantly. Supports US gallons (3.785411784 L) and UK/Imperial gallons (4.54609 L) with exact conversion factors.
  • Volume of a Cylinder Calculator
    Calculate the volume of a cylinder instantly from its radius and height using V = πr²h. Also shows base area and total surface area.
  • Volume of a Sphere Calculator
    Calculate the volume of a sphere from its radius using V = (4/3)πr³. Instantly get volume, diameter, and surface area in any unit.
  • Perimeter of a Rectangle Calculator
    Calculate the perimeter of a rectangle instantly using P = 2(l + w). Enter length and width to get perimeter, area, and diagonal.
  • Vertex of a Parabola Calculator
    Find the vertex (h, k) of a parabola y = ax² + bx + c instantly. Computes x = -b/(2a) and the vertex y-value, plus the vertex form.
  • Circle Area from Circumference Calculator
    Find a circle's area directly from its circumference using A = C² / (4π). Instant, accurate results plus the radius and diameter.
  • Deck Area Calculator
    Calculate your deck's square footage and the number of decking boards you need, including a waste allowance. Free, instant deck material estimator.
  • Lawn Area Calculator
    Calculate the total square footage of your lawn or yard by adding up to 3 rectangular sections. Get results in sq ft, sq yards, sq meters, and acres.
  • Square Meters to Acres Converter
    Convert square meters to acres instantly. Enter an area in m² to get the equivalent in acres using the exact factor 1 acre = 4046.8564224 m².
  • Hectares to Square Meters Converter
    Convert hectares to square meters instantly. Enter an area in hectares (ha) and get the exact value in square meters (m²) using 1 ha = 10,000 m².
  • Acres to Square Meters Converter
    Convert acres to square meters instantly. Enter any acreage and get the exact area in m² using 1 acre = 4046.8564224 square meters.
  • Square Meters to Hectares Converter
    Convert square meters (m²) to hectares (ha) instantly. Just divide by 10,000. Free, accurate area unit converter with formula and worked examples.
  • Triangle Area (SAS) Calculator
    Find the area of a triangle from two sides and the included angle (SAS) using A = ½·a·b·sin C. Enter sides a, b and angle C in degrees.
  • Land Area Calculator (Square Feet to Acres)
    Convert a plot's length and width in feet to acres instantly. Enter dimensions and get area in acres, square feet, and square meters.
  • Roof Surface Area Calculator
    Calculate total roof surface area, slope factor, and roofing squares from your building footprint and roof pitch (rise/run). Free and accurate.
  • Heron's Formula Calculator
    Calculate the area of any triangle from its three side lengths using Heron's formula. Get area, semi-perimeter, and perimeter instantly.
  • Circle Circumference from Area Calculator
    Find the circumference of a circle from its area instantly. Enter the area and get the circumference, radius, and diameter using C = 2√(πA).
  • Diameter from Circumference Calculator
    Find the diameter of a circle from its circumference using d = C / π. Instantly calculate diameter and radius from any circumference value.
  • Radius from Circumference Calculator
    Find the radius of a circle from its circumference using r = C / (2π). Also returns diameter and area instantly in the same unit.

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