- Volume Calculator
- Area Calculator
- Perimeter Calculator
- Surface Area Calculator
- Circle Calculator
- Rectangle Calculator
- Triangle Calculator
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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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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.
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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.
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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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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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Triangle Altitude CalculatorCompute the three altitudes (heights) of a triangle from its side lengths using Heron's formula. Get h_a, h_b, h_c and the area instantly.
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Right Triangle from Perimeter and Area CalculatorCalculate the height of an equilateral triangle from its side length using h = (√3/2)·a. Also returns area and perimeter instantly.
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Angle of Elevation CalculatorFind the angle of elevation from height and horizontal distance using arctan. Get the angle in degrees, radians, line-of-sight length and slope grade.
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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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SOHCAHTOA CalculatorFree SOHCAHTOA calculator. Enter a right-triangle angle and one side to solve the opposite, adjacent, and hypotenuse plus sin, cos, and tan.
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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 Classification CalculatorClassify a triangle as acute, right, or obtuse from its three side lengths by comparing the square of the longest side to the sum of the other two squared.
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Law of Cosines Third Side CalculatorFind the third side of a triangle from two sides and the included angle (SAS) using the Law of Cosines: c = √(a² + b² − 2ab·cos C).
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Angle Bisector Theorem CalculatorUse the Angle Bisector Theorem to split side BC into segments BD and DC proportional to the adjacent sides AB and AC. Free, instant geometry solver.
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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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Heron's Formula Area CalculatorFind a triangle's area from its three side lengths using Heron's formula. Enter sides a, b, and c to get the area, semi-perimeter, and perimeter instantly.
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Right Triangle Area CalculatorCalculate the area of a right triangle from its two legs using A = ½·a·b. Also returns hypotenuse and perimeter instantly.
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Triangle Area CalculatorCalculate the area of a triangle from its base and height using A = ½·b·h. Fast, free, and accurate for any unit of measurement.
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Triangle Area from Coordinates CalculatorFind the area of a triangle from the (x, y) coordinates of its three vertices using the Shoelace formula. Free, instant, and shows orientation.
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Equilateral Triangle Perimeter CalculatorCalculate the perimeter of an equilateral triangle instantly using P = 3a. Enter the side length to get the total perimeter in one click.
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Area of a Triangle CalculatorCalculate the area of a triangle from its base and height using A = ½ × base × height. Fast, accurate, and works with any units.
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Area of a Triangle CalculatorCalculate the area of any triangle from its three side lengths using Heron's formula. Also returns semi-perimeter and perimeter, and checks validity.
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45-45-90 Triangle Area CalculatorFind the area of a 45-45-90 right isosceles triangle from a leg or hypotenuse. Uses A = leg²/2 or hypotenuse²/4. Free and instant.
