- Volume Calculator
- Area Calculator
- Perimeter Calculator
- Surface Area Calculator
- Circle Calculator
- Rectangle Calculator
- Triangle Calculator
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ASA Triangle CalculatorSolve an ASA triangle from two angles and the included side. Get the third angle, all sides, perimeter, and area using the law of sines.
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Base of a Triangle CalculatorFind the base of a triangle from its area and height using base = 2 × Area ÷ height. Fast, free triangle base calculator with worked example.
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Triangle Angle CalculatorFind all three angles of a triangle from its three side lengths using the law of cosines. Free SSS triangle angle calculator with worked example.
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45-45-90 Triangle CalculatorSolve a 45-45-90 right triangle instantly. Enter a leg or the hypotenuse to get the other side, area and perimeter using the x, x, x√2 ratio.
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Similar Triangles CalculatorFind the scale factor between similar triangles, then compute corresponding sides and the area ratio (k²). Fast, accurate, with worked examples.
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Right Triangle Side and Angle CalculatorFind the hypotenuse, angles, area and perimeter of a right triangle from its two legs using the Pythagorean theorem and trigonometry.
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Pythagorean Triples CalculatorGenerate Pythagorean triples (a, b, c) from two integers m and n using Euclid's formula a=m²−n², b=2mn, c=m²+n². Verifies a²+b²=c² instantly.
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Perimeter of a Triangle CalculatorCalculate the perimeter of a triangle from its three side lengths instantly. Uses P = a + b + c and also shows the semi-perimeter.
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Circumscribed Circle CalculatorFind the circumradius of a triangle from its three sides. Computes R = abc/(4·Area) using Heron's formula, plus diameter, circumference and circle area.
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Heron's Formula CalculatorCalculate the area of any triangle from its three side lengths using Heron's formula. Instantly get the area, semi-perimeter, and perimeter.
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Area of a Right Triangle CalculatorCalculate the area of a right triangle from its two legs (base and height). Also returns the hypotenuse and perimeter instantly. Free online tool.
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30 60 90 Triangle CalculatorSolve any 30-60-90 right triangle. Enter one side to instantly find the other two sides, area, and perimeter using the 1 : √3 : 2 ratio.
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Orthocenter CalculatorFind the orthocenter of a triangle from vertex coordinates A, B, C. Computes the intersection of the altitudes with exact step-friendly formulas.
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Area of an Obtuse Triangle CalculatorFind the area of an obtuse triangle using base and height or Heron's formula from three sides. Free, instant, and accurate online calculator.
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Angle of Right Triangle CalculatorFind the acute angle of a right triangle from any two sides using arctan, arcsin, or arccos. Get the result in degrees and radians instantly.
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AAS Triangle CalculatorSolve an AAS triangle from two angles and one side. Computes the third angle, both missing sides, perimeter, and area using the law of sines.
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Area of an Oblique Triangle CalculatorFind the area of any oblique triangle from two sides and the included angle using Area = ½·a·b·sin(C). Fast, accurate SAS area calculator.
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Triangle Area Calculator (3 Sides – Heron's Formula)Calculate 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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Scalene Triangle Solver CalculatorSolve any general triangle from 14 input combinations of sides, angles, height or area. Get all three sides, all angles, the altitude and area instantly.
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Isosceles Triangle CalculatorSolve every element of an isosceles triangle from any two known values: base, equal legs, height, base angle, apex angle or area. Free online solver.
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Right Triangle SolverSolve a right triangle from any two known elements. Enter base, height, hypotenuse, base angle or area and get all remaining sides, the angle and area.
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Triangle Angles from Three Sides CalculatorCompute all three interior angles of a triangle from its side lengths, in decimal degrees and degrees-minutes-seconds, plus the height and area via Heron's formula.
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Triangle Area from One Side and Two Adjacent Angles (ASA)Compute a triangle's area, perimeter, and height from one included side and its two adjacent angles (ASA case). Supports degrees or radians.
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Right Triangle Hypotenuse and Height from Base and Slope AngleCompute the hypotenuse c and height b of a right triangle from the base a and slope angle theta. Uses c = a / cos(theta) and b = a * tan(theta).
