- Volume Calculator
- Area Calculator
- Perimeter Calculator
- Surface Area Calculator
- Circle Calculator
- Rectangle Calculator
- Triangle Calculator
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Height of a Triangle from Area and Base CalculatorFind the height of a triangle from its area and base length. Uses h = 2 × Area / base. Fast, free, and works with any units.
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Roof Pitch Angle CalculatorCalculate roof pitch angle in degrees from rise and run. Also gives x-in-12 pitch, slope length and slope percentage for any roof or ramp.
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Triangle Area (SAS) CalculatorFind the area of a triangle from two sides and the included angle (SAS) using A = ½·a·b·sin C. Enter sides a, b and angle C in degrees.
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Heron's Formula CalculatorCalculate the area of any triangle from its three side lengths using Heron's formula. Get area, semi-perimeter, and perimeter instantly.
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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.
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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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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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Missing Angle from Law of Sines CalculatorFind 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.
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Missing Side from Law of Sines CalculatorFind an unknown triangle side using the Law of Sines: enter a known side, its opposite angle, and the angle opposite the missing side.
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Right Triangle Perimeter from Two Legs CalculatorFind the perimeter of a right triangle from its two legs. Enter leg a and leg b to get the hypotenuse and total perimeter instantly.
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Heron's Formula CalculatorFind the area of any triangle from its three side lengths using Heron's formula. Free calculator showing area, semi-perimeter and perimeter instantly.
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30-60-90 Triangle Sides from Short LegFind all sides of a 30-60-90 triangle from the short leg. Computes long leg (short·√3), hypotenuse (2·short), perimeter, and area instantly.
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45-45-90 Triangle Hypotenuse CalculatorFind the hypotenuse of a 45-45-90 right triangle from a leg length using h = leg × √2. Also gives perimeter and area instantly.
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Triangle Third Angle CalculatorFind the third angle of any triangle instantly. Enter two known angles and get the missing angle using C = 180° − A − B. Free and accurate.
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Distance Between Two Points CalculatorFind the distance between two points (x1,y1) and (x2,y2) on a coordinate plane — the length of a triangle side — using the distance formula.
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Sine, Cosine & Tangent of an Angle CalculatorCalculate sin(θ), cos(θ) and tan(θ) for any angle in degrees or radians. Instant trigonometric function values with a clear worked example.
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Area of Isosceles Triangle from Base and Equal SidesCalculate the area, height, and perimeter of an isosceles triangle from its base and two equal sides using the exact geometric formula.
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Triangle Perimeter & Semiperimeter CalculatorCalculate the perimeter and semiperimeter of a triangle from its three sides, with a Heron's formula area check and triangle inequality validation.
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Law of Cosines Calculator (Side c)Find the third side c of any triangle using the Law of Cosines: c = √(a² + b² − 2ab·cos C). Enter two sides and the included angle in degrees.
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Arcsine CalculatorFind an angle from the opposite side and hypotenuse using arcsine. Enter both sides to get the angle in degrees and radians instantly.
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Arccosine Angle CalculatorFind the angle of a right triangle from its adjacent side and hypotenuse using θ = arccos(adjacent / hypotenuse). Results in degrees and radians.
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Hypotenuse Calculator from Two LegsFind the hypotenuse of a right triangle from its two legs using the Pythagorean theorem c = √(a² + b²). Also shows area and perimeter.
