- Volume Calculator
- Area Calculator
- Perimeter Calculator
- Surface Area Calculator
- Circle Calculator
- Rectangle Calculator
- Triangle Calculator
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Triangle Ratio CalculatorFind all three triangle side lengths from a ratio a:b:c and one known side. Proportional scaling gives each side plus the perimeter instantly.
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Triangle Sum Theorem CalculatorFind the missing third angle of a triangle using the Triangle Sum Theorem (A + B + C = 180°). Enter two known angles to get the third instantly.
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Theta (Angle) CalculatorCalculate the angle theta (θ) of a right triangle from its opposite and adjacent sides using atan2. Get the result in degrees and radians instantly.
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Tangent Ratio CalculatorCalculate the tangent ratio of an angle in a right triangle from the opposite and adjacent sides, plus the angle in degrees. Free trig tool.
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SSS Triangle CalculatorSolve any triangle from its three sides (SSS) using the Law of Cosines. Get all three angles, perimeter, and area instantly with worked steps.
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SSA Triangle Calculator (Law of Sines)Solve SSA triangles with the Law of Sines. Enter two sides and a non-included angle to find angle B, angle C, side c, and the number of triangles.
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Oblique Triangle CalculatorSolve any oblique (non-right) triangle from 3 known parts using the law of sines and law of cosines. Find missing sides, angles, perimeter and area.
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Obtuse Triangle CalculatorSolve a triangle from two sides and the included angle. Find the third side, area, perimeter, all angles, and whether the triangle is obtuse.
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Isosceles Triangle Leg Length CalculatorFind the equal leg length (a) of an isosceles triangle from its base and height. Also computes perimeter and area instantly.
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Square Feet of a Triangle CalculatorCalculate the area of a triangle in square feet from its base and height. Instantly converts to square yards and square meters too.
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Pythagoras Triangle CalculatorCalculate the hypotenuse of a right triangle from its two legs using the Pythagorean theorem c = √(a² + b²). Also shows area and perimeter.
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Perimeter of a Triangle with Vertices CalculatorFind the perimeter of a triangle from its three vertex coordinates (x, y). Uses the distance formula to sum all three side lengths instantly.
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Perimeter of a Triangle with Fractions CalculatorFind the perimeter of a triangle whose sides are fractions. Enter each side as numerator/denominator and get P = a + b + c instantly.
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Perimeter of a Right Triangle CalculatorCalculate 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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Missing Side of a Right Triangle CalculatorFind the missing side of a right triangle using the Pythagorean theorem. Solve for the hypotenuse or a leg from any two known sides instantly.
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Midsegment of a Triangle CalculatorFind the midsegment of a triangle instantly. Enter the base side and get the parallel midsegment length, which equals half the base.
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Isosceles Triangle Side CalculatorFind the leg or base of an isosceles triangle from a known side and base angle. Uses leg = base/(2·cos θ) and base = 2·leg·cos θ.
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Isosceles Triangle Angles CalculatorFind the missing angles of an isosceles triangle. Enter a base angle or the vertex angle and instantly get the remaining angles.
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Is it a Right Triangle CalculatorCheck if three side lengths form a right triangle. Enter sides a, b and c — we test the Pythagorean theorem a² + b² = c² instantly.
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Isosceles Right Triangle Hypotenuse CalculatorFind the hypotenuse of an isosceles right triangle from one leg using hypotenuse = leg × √2. Also returns area and perimeter instantly.
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Triangle Interior and Exterior Angles CalculatorFind the third interior angle and all three exterior angles of any triangle from two known interior angles. Uses the 180° angle-sum rule.
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Cosine Rule Triangle CalculatorSolve a triangle with the law of cosines. Enter two sides and the included angle to find the third side, remaining angles, perimeter, and area.
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Circumcenter CalculatorFind the circumcenter of a triangle from three vertex coordinates. Computes Ux, Uy and the circumradius using perpendicular-bisector equations.
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Centroid of a Triangle CalculatorFind the centroid (G) of a triangle from its three vertex coordinates. Enter (x,y) for each corner to get the exact center of mass instantly.
