Geometry

  • Paint-by-Numbers Acrylic Paint Coverage Calculator
    Estimate how much area your acrylic paint covers from mL and coverage per mL. Adjusts for multiple coats. Great for paint-by-numbers and craft projects.
  • Square Footage of Walls in a Room Calculator (Wall Area + Drywall Sheets)
    Calculate how many drywall sheets you need for a room. Enter length, width and wall height, pick a sheet size, add waste — get total sheets fast.
  • Right Triangle from Perimeter and Area Calculator
    Calculate the height of an equilateral triangle from its side length using h = (√3/2)·a. Also returns area and perimeter instantly.
  • 45-Degree Rule Rise Over Run Calculator
    Calculate slope from rise over run instantly. Get the slope ratio, grade percentage, and angle of incline in degrees for any roof, ramp, or line.
  • Swimming Pool Gallons Calculator for Any Shape (Surface Area × Depth)
    Estimate the water volume in gallons of a kidney-shaped or irregular swimming pool from its surface area and average depth. Free and instant.
  • Net vs Gross Floor Area Calculator (Carpet to Built-up Area)
    Convert carpet area to built-up and super built-up area using loading and common-area factors. Free real-estate floor-area calculator.
  • Cube Surface Area Calculator
    Enter a cube’s side length to instantly calculate its total surface area (A = 6s²). Quick help for geometry, homework, and simple planning.
  • Tank Volume Calculator
    Calculate the volume and capacity of horizontal or vertical cylindrical tanks in cubic meters, liters, and US gallons from diameter and length.
  • Volume Conversion Calculator
    Convert volume between liters, milliliters, US gallons, quarts, pints, cups, and fluid ounces instantly. Uses US customary units for liquid measures.
  • Equilateral Triangle Area Calculator
    Calculate the area, perimeter, and height of an equilateral triangle from its side length. Free, unit-agnostic geometry tool with worked examples.
  • Distance Formula Calculator
    Calculate the straight-line distance between two points (x₁,y₁) and (x₂,y₂) using the distance formula d = √((x₂−x₁)² + (y₂−y₁)²).
  • Base of a Triangle Calculator
    Find the base of a triangle from its area and height using base = 2 × Area ÷ height. Fast, free triangle base calculator with worked example.
  • Arc Length from Degrees Calculator
    Calculate the arc length of a circle from its radius and central angle in degrees. Also shows radians and full circumference instantly.
  • Annulus (Ring) Area Calculator
    Calculate the area of an annulus (ring) from its outer and inner radii using A = π(R² − r²). Also shows ring width and circumferences.
  • Area of a Square Calculator
    Calculate the area of a square instantly with side length using A = s². Also shows perimeter and diagonal. Free, fast, and accurate geometry tool.
  • Perimeter of a Circle Calculator
    Calculate the perimeter (circumference) of a circle from its radius using P = 2πr. Also shows diameter and area. Fast, free and accurate.
  • Distance, Midpoint & Slope Calculator
    Find the distance, midpoint, and slope between two points (x₁,y₁) and (x₂,y₂) on the coordinate plane. Free, instant, step-friendly results.
  • Area of a Pentagon Calculator
    Calculate the area of a regular pentagon from its side length. Get area, perimeter and apothem instantly with the exact geometric formula.
  • Area of a Sector Calculator
    Calculate the area of a circular sector from radius and central angle in degrees or radians. Also gives arc length. Free, instant, with formula and examples.
  • Conical Frustum Volume Calculator
    Calculate the volume of a conical frustum with this Conical Frustum Volume Calculator. Input top radius, bottom radius, and height for accurate results. Ideal for geometry and engineering applications.
  • Hemisphere Volume Calculator
    Calculate hemisphere volume easily with this free online tool. Input the radius to instantly determine the volume of a hemisphere. Accurate results for spherical segments.
  • Isosceles Triangle Area Calculator
    Calculate the area of an isosceles triangle easily with base and height inputs. Get accurate results instantly for geometry problems and real-world applications.
  • Triangle Area Calculator Without Height
    Find the area of a triangle without knowing its height. Enter the three side lengths and this Heron formula calculator returns the exact area.
  • Complete the Square to Find Circle Center & Radius
    Convert the general circle equation x²+y²+Dx+Ey+F=0 to standard form. Instantly find the center (−D/2, −E/2) and radius by completing the square.

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