Geometry

  • Acre-Feet to Gallons Calculator
    Convert acre-feet to US gallons instantly. Enter acre-feet and get the exact gallon volume using 1 acre-foot = 325,851 gallons.
  • Arc Length Calculator (s = rθ)
    Calculate the arc length of a circle from its radius and central angle using s = rθ. Supports angles in radians or degrees, with instant results.
  • Cubic Feet Calculator (Volume & Cost for Multiple 3D Shapes)
    Calculate volume in cubic feet for boxes, rooms, tanks, cylinders, spheres and more. Convert to cubic inches, yards, meters, gallons, liters and total cost.
  • Square Feet to Cents Converter
    Convert square feet to cents, the traditional Indian land area unit. 1 cent = 435.6 sq ft. Fast, accurate land area conversion for property in India.
  • Acres to Square Yards Converter
    Convert acres to square yards instantly. Enter any acreage and get the exact area in square yards using the factor 1 acre = 4,840 yd².
  • 30-60-90 Triangle Area Calculator
    Calculate the area of a 30-60-90 right triangle from the short leg. Get area, long leg, hypotenuse, and perimeter instantly using A = (√3/2)·x².
  • Square Centimeters to Square Meters Converter
    Convert square centimeters (cm²) to square meters (m²) instantly. Just divide by 10,000. Free, accurate area unit converter with formula and examples.
  • 45-45-90 Triangle Area Calculator
    Find the area of a 45-45-90 right isosceles triangle from a leg or hypotenuse. Uses A = leg²/2 or hypotenuse²/4. Free and instant.
  • Square Kilometers to Square Miles Converter
    Convert square kilometers (km²) to square miles (sq mi) instantly. Enter an area and get an accurate result using the factor 0.386102159.
  • Concrete Slab Calculator
    Calculate concrete slab area and volume. Enter length, width, and thickness to get square feet, cubic feet, cubic yards, and bag estimates.
  • Square Miles to Acres Converter
    Convert square miles to acres instantly. 1 square mile equals 640 acres. Fast, accurate area conversion for land, farming and real estate.
  • Shaded Region Area Calculator (Circle in Square)
    Calculate the shaded area of a square with an inscribed circle removed. Enter the side length to get the leftover corner area instantly using A = s² − π(s/2)².
  • SOH CAH TOA Calculator
    Solve right triangles with SOH CAH TOA. Enter the two legs to get the hypotenuse, angle θ, and the sine, cosine, and tangent ratios instantly.
  • Sum of Interior Angles of a Polygon Calculator
    Find the sum of interior angles of any polygon using S = (n − 2) × 180. Also get each interior and exterior angle for regular polygons.
  • Area of a Circle Calculator
    Calculate the area of a circle from its radius using A = πr². Also returns the diameter and circumference instantly. Free online geometry tool.
  • Area of a Triangle Calculator
    Calculate the area of a triangle from its base and height using A = ½ × base × height. Fast, accurate, and works with any units.
  • Distance from a Point to a Line Calculator (2D)
    Compute the perpendicular distance from a point (x₀, y₀) to a line Ax + By + C = 0 in 2D using the standard distance formula. Free and instant.
  • Area of a Triangle Calculator
    Calculate the area of any triangle from its three side lengths using Heron's formula. Also returns semi-perimeter and perimeter, and checks validity.
  • Pool Volume Calculator
    Calculate the volume of a rectangular swimming pool in US gallons from length, width, and depth. Includes liters, surface area, and average depth.
  • Concrete Slab Calculator
    Calculate concrete needed for a slab in cubic yards and cubic feet, plus how many 40, 50, 60 or 80 lb bags to buy. Free estimator.
  • Square Footage Calculator
    Calculate square footage instantly. Enter length and width in feet to get total area in square feet, square yards, and square meters.
  • Liters to Gallons Converter
    Convert liters to gallons instantly. Get both US liquid gallons and UK imperial gallons from any volume in liters, with the exact formula shown.
  • Paint Volume & Coverage Calculator
    Calculate how many gallons of paint you need based on wall area, number of coats, and coverage per gallon. Free, fast paint estimator.
  • Engine Displacement Volume Calculator
    Calculate total engine displacement from bore, stroke and cylinder count. Get results in cc, liters and cubic inches instantly with this free tool.

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