Geometry

  • 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.
  • Perimeter of a Square from Area Calculator
    Find the perimeter of a square from its area instantly. Enter the area and get the side length and perimeter using P = 4√A. Free, fast, accurate.
  • Oval Pool Water Volume Calculator
    Calculate the water volume of an oval or ellipse swimming pool in US gallons, cubic feet and liters from length, width and depth.
  • Prism Volume Calculator (Any Cross-Section)
    Calculate the volume of any prism from its cross-section area and length. Works for triangular, hexagonal, irregular and all uniform prisms.
  • Vertical Cylindrical Tank Volume Calculator
    Calculate total and filled volume of a vertical cylindrical tank from diameter, height and liquid level. Get m³, litres and fill percentage instantly.
  • Propane Tank Volume Calculator
    Calculate propane tank water capacity and usable gallons from diameter and length. Capsule-shape volume with adjustable fill percentage (default 80%).
  • Cone Frustum Volume Calculator (Diameters)
    Calculate the volume of a conical frustum (truncated cone) from its bottom diameter, top diameter, and height using V = (π·h/12)(D²+Dd+d²).
  • Pool Water Volume Calculator
    Calculate swimming pool water volume in gallons and liters from length, width, and average depth in feet or meters. Fast, accurate, and free.

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