- Fraction Calculator
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Complex Number to Rectangular Form CalculatorConvert a complex number from polar form (r, θ) to rectangular form a + bi. Enter magnitude and angle in degrees or radians for instant results.
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Complex Number to Trigonometric Form CalculatorConvert a complex number a + bi to trigonometric (polar) form r(cos θ + i sin θ). Get the modulus r and argument θ in degrees and radians instantly.
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Complex Number to Polar Form CalculatorConvert a complex number a + bi to polar form. Get magnitude r and angle θ in degrees and radians instantly, with the full formula explained.
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Triangle Area Calculator (SAS)Calculate the area of a triangle from two sides and their included angle (SAS) using Area = ½·a·b·sin(C). Fast, accurate, free.
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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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Inverse Cosine CalculatorEnter a cosine value between -1 and 1 to compute the inverse cosine (arccos) and see the corresponding angle in degrees and radians instantly.
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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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Cosine CalculatorEnter an angle in degrees to get the cosine value instantly, plus the angle converted to radians. Simple tool for quick trigonometry.
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Reference Angle CalculatorFind the reference angle of any angle in degrees or radians. Instantly see the normalized angle, its quadrant, and the acute reference angle.
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Supplementary Angles CalculatorFind the supplementary angle instantly. Enter any angle in degrees and get its supplement using supplement = 180 − angle. Free, fast, and accurate.
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Clock Angle CalculatorCalculate the exact angle between the hour and minute hands of an analog clock for any time using the standard 30H − 5.5M formula.
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Coterminal Angle CalculatorFind coterminal angles in degrees or radians. Get the smallest positive and negative coterminal angles using angle ± 360°n or ± 2πn.
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Central Angle CalculatorFind the central angle of a circle from arc length and radius. Get the angle instantly in both radians and degrees with this free calculator.
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Complementary Angles CalculatorFind the complementary angle instantly. Enter any angle and get its complement (90 − angle) in degrees. Free, accurate geometry 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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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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Involute Function CalculatorCalculate the involute function inv(α) = tan(α) − α for any angle in degrees or radians. Essential for gear and spline tooth geometry design.
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Unit Circle CalculatorFind the (x, y) coordinates on the unit circle for any angle in degrees or radians. Computes cos θ, sin θ, and tan θ instantly.
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Sum and Difference Identities CalculatorCompute sin(a±b) and cos(a±b) instantly using the trigonometric sum and difference identities. Enter angles in degrees or radians.
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Inverse Trigonometric Functions CalculatorCompute arcsin, arccos and arctan online. Enter a value to find the angle θ in both degrees and radians instantly with this free calculator.
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Power Reducing CalculatorApply the power-reducing trig identities to find sin²θ, cos²θ and tan²θ from any angle in degrees or radians. Free, instant, step-shown results.
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Phase Shift CalculatorCalculate the phase shift, period, amplitude, and vertical shift of a sine or cosine function y = A·sin(Bx − C) + D instantly.
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Double Angle Formula CalculatorCompute sin(2θ), cos(2θ), and tan(2θ) from any angle in degrees or radians using the trigonometric double-angle identities, instantly.
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Half Angle CalculatorCompute sin(θ/2), cos(θ/2), and tan(θ/2) from any angle θ in degrees using the trigonometric half-angle identities. Fast, exact, free.
