Geometry

  • 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.
  • Number of Tiles to Cover a Rectangle Calculator
    Calculate how many rectangular tiles you need to cover a rectangular floor or wall, including a waste allowance for cuts and breakage.
  • Triangle Altitude Calculator
    Compute the three altitudes (heights) of a triangle from its side lengths using Heron's formula. Get h_a, h_b, h_c and the area instantly.
  • Angle of Elevation Calculator
    Find the angle of elevation from height and horizontal distance using arctan. Get the angle in degrees, radians, line-of-sight length and slope grade.
  • Right Triangle Leg from Hypotenuse and Other Leg
    Find the missing leg of a right triangle from the hypotenuse and one leg using b = √(c² − a²). Fast, accurate Pythagorean solver.
  • Rectangle Fence Cost Calculator
    Estimate the cost to fence a rectangular yard. Enter length, width, and price per foot to get the perimeter and total fencing material cost instantly.
  • Equilateral Triangle Height from Side Calculator
    Calculate the height of an equilateral triangle from its side length using h = (√3/2)·a. Also returns area and perimeter instantly.
  • Rectangle Area in Acres Calculator
    Calculate the area of a rectangular plot in acres from its length and width in feet. Instant feet-to-acres conversion using 1 acre = 43,560 sq ft.
  • Diameter from Area Calculator
    Find a circle's diameter from its area using d = 2√(A/π). Instantly get diameter, radius, and circumference from any area value.
  • Rectangle Square Footage Cost Calculator
    Calculate the total cost of a rectangular area by multiplying its square footage (length × width) by your price per square foot. Fast and free.
  • Area from Circumference Calculator
    Find the area of a circle from its circumference using A = C² / (4π). Also returns radius and diameter instantly. Free online geometry calculator.
  • Circle Moment of Inertia (Area) Calculator
    Calculate the area moment of inertia of a solid circle from its radius or diameter using I = πr⁴/4 = πd⁴/64. Free engineering tool.
  • Partially Filled Circle Area Calculator
    Calculate the filled cross-section area and fill percentage of a partially filled circle or cylindrical tank from radius and fill depth.
  • Surface Area of a Cylinder Calculator
    Calculate the total surface area of a cylinder from its radius and height using SA = 2πr² + 2πrh. See lateral and base areas instantly.
  • Radius from Area of a Circle Calculator
    Find the radius of a circle from its area using r = √(A/π). Instantly get radius, diameter, and circumference for any circle area.
  • Interior Angle of a Regular Polygon Calculator
    Find each interior angle of a regular polygon from the number of sides using (n−2)×180/n. Also shows exterior angle and the sum of interior angles.
  • Room Perimeter Calculator for Baseboard & Trim
    Calculate the perimeter of a rectangular room and the linear feet of baseboard or trim you need, minus doorways and plus a waste allowance.
  • Perimeter of an L-Shape Calculator
    Calculate the perimeter of an L-shaped figure from its overall outer width and height using P = 2 × (a + b). Fast, free, and accurate.

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