Geometry

  • Degrees to Radians Calculator
    Convert degrees to radians instantly. Enter any angle in degrees and get the exact radian value plus its multiple of π using radians = degrees × π / 180.
  • Circumference from Radius Calculator
    Calculate the circumference of a circle from its radius using C = 2πr. Instantly get circumference, diameter, and area from any radius value.
  • Area from Radius Calculator
    Calculate the area of a circle from its radius using A = πr². Also returns diameter and circumference instantly. Free, accurate circle area tool.
  • Clock Angle Calculator
    Calculate the angle between the hour and minute hands of a clock at any time using the formula |30H − 5.5M|. Instant, accurate, with reflex angle.
  • Volume of a Box Calculator
    Calculate the volume of a rectangular box (cuboid) instantly. Enter length, width, and height to find volume with the V = l × w × h formula.
  • 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.
  • Area of a Triangle (Base × Height) Calculator
    Calculate the area of any triangle from its base and height using A = ½ × b × h. Fast, free, and accurate for geometry, math homework, and design.
  • Area of a Trapezoid Calculator
    Calculate the area of a trapezoid instantly from its two parallel bases and height using A = ((a + b) / 2) × h. Free, fast and accurate.
  • Surface Area of a Sphere Calculator
    Calculate the surface area of a sphere from its radius using SA = 4πr². Instantly get surface area, diameter, and volume for any sphere.
  • Area of a Rhombus from Diagonals Calculator
    Calculate the area of a rhombus instantly from its two diagonals using A = (d₁ × d₂) / 2. Free, accurate, and easy to use.
  • Area of a Parallelogram Calculator
    Calculate the area of a parallelogram instantly using base and height with the formula A = b × h. Free, accurate, and easy-to-use geometry tool.
  • Missing Angle from Law of Sines Calculator
    Find a triangle's unknown angle using the Law of Sines: A = arcsin(a·sin B / b). Enter two sides and one opposite angle to solve instantly.
  • Missing Side from Law of Sines Calculator
    Find an unknown triangle side using the Law of Sines: enter a known side, its opposite angle, and the angle opposite the missing side.
  • Cooking Measurement Converter
    Convert cooking measurements between cups, tablespoons, teaspoons, fluid ounces and milliliters instantly with US customary volume equivalents.
  • Rectangular Room Square Footage Calculator
    Calculate the square footage of a rectangular room instantly. Enter length and width in feet to get area in sq ft, sq yards, and sq meters.
  • Arctangent (Arctan) Calculator
    Find the angle θ from the opposite and adjacent sides using θ = arctan(opposite/adjacent). Get the result in both degrees and radians instantly.
  • Missing Side of a Rectangle from Perimeter Calculator
    Find the unknown side of a rectangle from its perimeter and one known side. Uses missing_side = P/2 − known_side. Instant, free, and accurate.
  • Degrees-Minutes-Seconds to Decimal Degrees Calculator
    Convert latitude/longitude in degrees, minutes and seconds (DMS) to decimal degrees instantly using decimal = D + M/60 + S/3600.
  • Rectangular Carpet Cost Calculator
    Estimate the cost of carpeting a rectangular room. Enter length, width and price per square metre to get total floor area and carpet cost instantly.
  • Missing Side of a Rectangle from Area Calculator
    Find the missing side of a rectangle from its area and one known side. Enter area and a side to get the other side plus the perimeter instantly.
  • Maximum Area Rectangle for a Fixed Perimeter
    Find the maximum area of a rectangle for a given fixed perimeter. The optimum is always a square with side P/4 and area (P/4)². Free online tool.
  • Belt Length Around Two Pulleys Calculator
    Calculate the approximate length of an open belt around two pulleys from their diameters and center distance using the standard belt-length formula.
  • Rectangular Wall Area Calculator
    Calculate the area of a rectangular wall from its length and height, then subtract doors and windows to get the net paintable or tileable area in m².
  • Circle Degrees to Arc Length Calculator
    Convert a circle's central angle in degrees and radius into arc length. Free calculator with the L = (θ/360) × 2πr formula, radians, and circumference.

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