- Volume Calculator
- Area Calculator
- Perimeter Calculator
- Surface Area Calculator
- Circle Calculator
- Rectangle Calculator
- Triangle Calculator
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Rectangle Gravel/Mulch Volume CalculatorCalculate how many cubic yards of gravel, mulch, sand or topsoil you need to fill a rectangular area at a given depth. Enter length, width and depth.
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Shadow Length & Sun Angle CalculatorCalculate shadow length from the sun's elevation angle, or find the sun angle from an object's height and shadow length using simple trigonometry.
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Sine of an Angle CalculatorCalculate the sine of an angle in a right triangle from the opposite side and hypotenuse, then find the angle θ in degrees and radians using arcsine.
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Law of Cosines Angle CalculatorFind the angle of a triangle from its three side lengths using the law of cosines. Enter sides a, b, and c to get angle C in degrees and radians.
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Rectangular Concrete Slab Volume CalculatorCalculate how many cubic yards of concrete you need for a rectangular slab from its length, width, and thickness. Fast, accurate, and free.
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Paint Needed for a Rectangular Wall CalculatorCalculate how many gallons of paint you need for a rectangular wall from its length, height, coverage per gallon, and number of coats.
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Rectangular Lumber Board Feet CalculatorCalculate board feet of rectangular lumber from length, width and thickness in inches. Multiply by board count for total BF instantly.
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Rectangular Pool Volume CalculatorCalculate how many gallons of water your rectangular pool holds. Enter length, width, and average depth in feet to get the volume instantly.
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Square Yards of a Rectangle CalculatorConvert a rectangle's length and width in feet to square yards instantly. Enter dimensions to get area in square yards and square feet.
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Circle to Cylinder Volume CalculatorTurn a circle's radius and a height into a cylinder volume instantly with V = πr²h. Free calculator showing circle area and total cubic volume.
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Rectangle Area Moment of Inertia CalculatorCalculate the area moment of inertia (Ix and Iy) of a rectangular cross-section about its centroidal axes from width and height.
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Circumference to Area CalculatorConvert a circle's circumference to its area instantly with A = C²/(4π). Also shows radius and diameter. Free, accurate geometry calculator.
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Diameter from Radius CalculatorFind a circle's diameter from its radius instantly using d = 2r. Also returns circumference and area. Fast, free, and accurate geometry tool.
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Radius from Circumference CalculatorFind a circle's radius from its circumference using r = C / (2π). Also returns diameter and area instantly. Free, accurate geometry calculator.
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Degrees to Radians CalculatorConvert 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.
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Circumference from Radius CalculatorCalculate the circumference of a circle from its radius using C = 2πr. Instantly get circumference, diameter, and area from any radius value.
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Area from Radius CalculatorCalculate the area of a circle from its radius using A = πr². Also returns diameter and circumference instantly. Free, accurate circle area tool.
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Clock Angle CalculatorCalculate 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.
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Volume of a Box CalculatorCalculate the volume of a rectangular box (cuboid) instantly. Enter length, width, and height to find volume with the V = l × w × h formula.
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Area of a Triangle (Base × Height) CalculatorCalculate 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.
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Area of a Trapezoid CalculatorCalculate the area of a trapezoid instantly from its two parallel bases and height using A = ((a + b) / 2) × h. Free, fast and accurate.
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Surface Area of a Sphere CalculatorCalculate the surface area of a sphere from its radius using SA = 4πr². Instantly get surface area, diameter, and volume for any sphere.
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Area of a Rhombus from Diagonals CalculatorCalculate the area of a rhombus instantly from its two diagonals using A = (d₁ × d₂) / 2. Free, accurate, and easy to use.
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Area of a Parallelogram CalculatorCalculate the area of a parallelogram instantly using base and height with the formula A = b × h. Free, accurate, and easy-to-use geometry tool.
