- Volume Calculator
- Area Calculator
- Perimeter Calculator
- Surface Area Calculator
- Circle Calculator
- Rectangle Calculator
- Triangle Calculator
-
Aquarium Volume CalculatorCalculate your fish tank volume in US gallons and liters from length, width, and height in inches. Free, instant aquarium capacity calculator.
-
Circumference of a Circle CalculatorCalculate the circumference of a circle from radius or diameter using C = 2πr = πd. Get circumference, diameter, and area instantly with worked examples.
-
Area of a Trapezoid CalculatorCalculate the area of a trapezoid instantly from its two parallel bases and height using A = ½(b₁ + b₂)·h. Free, fast, and accurate.
-
Volume of a Rectangular Prism CalculatorCalculate the volume of a rectangular prism (box) instantly with V = l × w × h. Also computes total surface area. Free, fast, and accurate.
-
Volume of a Cone CalculatorCalculate the volume of a cone instantly from its radius and height using V = (1/3)πr²h. Free, accurate cone volume calculator with worked example.
-
Surface Area of a Cube CalculatorCalculate the total surface area of a cube from its edge length using SA = 6s². Also shows the area of one face and the cube's volume.
-
45-Degree Rule Rise Over Run CalculatorCalculate slope from rise over run instantly. Get the slope ratio, grade percentage, and angle of incline in degrees for any roof, ramp, or line.
-
Number of Diagonals of a Polygon CalculatorFind how many diagonals a polygon has from its number of sides using D = n(n−3)/2. Fast, free, and works for any polygon with 3 or more sides.
-
3D Distance CalculatorCalculate the straight-line distance between two points in 3D space using their (x, y, z) coordinates with the 3D Euclidean distance formula.
-
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.
-
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.
-
45-45-90 Triangle Leg from Hypotenuse CalculatorFind the leg length of a 45-45-90 right isosceles triangle from its hypotenuse using leg = hypotenuse / √2. Also returns area and perimeter.
-
30-60-90 Triangle Sides from HypotenuseFind the short and long legs of a 30-60-90 right triangle from its hypotenuse. Uses short = h/2 and long = h·√3/2. Instant, accurate results.
-
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.
-
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.
-
Cosine of an Angle CalculatorCalculate the cosine of an angle in a right triangle from the adjacent side and hypotenuse, plus the angle θ in degrees and radians.
-
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.
-
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.
-
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.
-
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.
-
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.
-
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.
-
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.
-
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.
