Geometry

  • Keg Volume Calculator
    Find how many beers are in a keg. Enter keg size and serving ounces to get servings, gallons, fluid ounces, and liters instantly.
  • Fluid Ounces to Milliliters Converter
    Convert fluid ounces (fl oz) to milliliters (mL) instantly. Uses 1 US fl oz = 29.5735 mL. Fast, accurate oz to mL conversion for recipes and labels.
  • Carpet Area to Built-up Area Calculator
    Convert carpet area to built-up and super built-up area using loading and common-area factors. Free real-estate floor-area calculator.
  • Barrel Volume Calculator
    Calculate the volume of a barrel, cask, or drum using the Kepler approximation. Enter height and the middle & end diameters to get liters and gallons.
  • Heron's Formula Calculator
    Find the area of any triangle from its three side lengths using Heron's formula. Free calculator showing area, semi-perimeter and perimeter instantly.
  • 30-60-90 Triangle Sides from Short Leg
    Find all sides of a 30-60-90 triangle from the short leg. Computes long leg (short·√3), hypotenuse (2·short), perimeter, and area instantly.
  • 45-45-90 Triangle Hypotenuse Calculator
    Find the hypotenuse of a 45-45-90 right triangle from a leg length using h = leg × √2. Also gives perimeter and area instantly.
  • Laminate/Flooring Boxes for a Rectangular Room Calculator
    Calculate how many boxes of laminate or flooring you need for a rectangular room, including a waste allowance for cuts and mistakes.
  • Triangle Third Angle Calculator
    Find the third angle of any triangle instantly. Enter two known angles and get the missing angle using C = 180° − A − B. Free and accurate.
  • Rectangular Aquarium Volume in Gallons Calculator
    Calculate the volume of a rectangular aquarium in US gallons from its length, width, and height in inches. Also shows cubic inches and liters.
  • Mulch Bags for a Rectangular Bed Calculator
    Calculate how many bags of mulch you need to cover a rectangular garden bed. Enter length, width, depth, and bag size to get the exact bag count.
  • BTU for a Rectangular Room Calculator
    Calculate the air conditioner BTU needed to cool a rectangular room. Enter length and width in feet to size your AC unit with the 20 BTU/sq ft rule.
  • Distance Between Two Points Calculator
    Find the distance between two points (x1,y1) and (x2,y2) on a coordinate plane — the length of a triangle side — using the distance formula.
  • Wheel Revolutions to Distance Calculator
    Convert wheel revolutions into distance travelled. Enter wheel diameter and number of turns to get distance in meters, km, miles, and feet.
  • Bolt Circle Diameter Calculator
    Calculate the center-to-center chord spacing between bolt holes from the bolt circle diameter (BCD) and hole count, or back-solve the BCD.
  • Circular Motion Speed Calculator
    Convert RPM and radius into linear (tangential) speed and angular velocity. Uses v = 2πr·(RPM/60) = ωr for any rotating object.
  • Pizza Slice Calculator
    Calculate the area and crust length of each pizza slice from the radius and number of equal slices using circular sector geometry. Free and instant.
  • Square Centimeters of a Rectangle Calculator
    Calculate the area of a rectangle in square centimeters (cm²) instantly. Enter length and width in cm to get the area using A = l × w.
  • Square Inches of a Rectangle Calculator
    Calculate the area of a rectangle in square inches by multiplying length × width. Instant results plus a square-feet conversion.
  • Circle to Sphere Surface Area Calculator
    Calculate the surface area of a sphere from its radius using SA = 4πr². Also returns diameter and volume. Fast, free, and accurate geometry tool.
  • Circle to Sphere Volume Calculator
    Calculate the volume of a sphere from its radius using V = (4/3)πr³. Also returns diameter and surface area instantly with full precision.
  • Concrete Driveway Volume Calculator
    Calculate concrete volume in cubic yards and feet for a driveway or slab from length, width and thickness, plus 80 lb and 60 lb bag counts.
  • Square Feet per Gallon Paint Calculator
    Find out how many gallons of paint you need. Enter wall area, coverage per gallon, and coats to get the exact amount of paint to buy.
  • Wall Tile Calculator
    Calculate how many wall tiles you need for a backsplash or feature wall. Enter wall size, tile size, and waste % to get the exact tile count.

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