From resolving a right triangle to applying the Law of Cosines for oblique cases, this collection covers the full range of trig calculations. The Sine Calculator, Cosine Calculator, and Arctan Calculator handle individual function values, while the Right Triangle Calculator solves for any unknown side or angle in one go.
Browse the full list or flip to the Trending tab to see which tools other users are reaching for. Everything is free, needs no account, and works on any device.
- Fraction Calculator
- Matrix Calculator
- Slope Calculator
- Algebra Calculator
- Trigonometry Calculator
- Percentage Calculator
- Probability Calculator
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Trig Identity Verifier Calculator ā Pythagorean Identity (sinĀ²Īø + cosĀ²Īø = 1)Verify sinĀ²Īø + cosĀ²Īø = 1 and find cos Īø from sin Īø using cos Īø = Ā±ā(1āsinĀ²Īø). Pick the quadrant to choose the correct sign.
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Projectile Range CalculatorCalculate the horizontal range of a projectile from launch velocity and angle using R = vĀ²Ā·sin(2Īø)/g. Also returns max height and flight time.
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Arctan CalculatorEnter a tangent value and choose degrees or radians to compute the arctangent (inverse tangent). See the angle in both units with precise results.
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Amplitude, Period & Phase Shift CalculatorFind amplitude, period, phase shift, and vertical shift of y = aĀ·sin(bx ā c) + d. Enter a, b, c, d and get all transformations instantly.
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Bearing Between Two Points CalculatorCalculate the initial true bearing (forward azimuth) in degrees between two latitude/longitude coordinates using the great-circle atan2 formula.
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Linear Velocity from Angular Velocity CalculatorCalculate linear (tangential) velocity from radius and angular velocity using v = rĀ·Ļ. Enter radius in meters and Ļ in rad/s to get speed in m/s.
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Arc Length Calculator (s = rĪø)Calculate the arc length of a circle from its radius and central angle using s = rĪø. Supports angles in radians or degrees, with instant results.
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Find All Six Trig Functions from One RatioEnter one trig ratio (sin, cos, tan, etc.) and the quadrant of Īø to instantly find all six trigonometric functions using the Pythagorean identity.
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SOH CAH TOA CalculatorSolve right triangles with SOH CAH TOA. Enter the two legs to get the hypotenuse, angle Īø, and the sine, cosine, and tangent ratios instantly.
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Amplitude, Period & Frequency CalculatorFind the amplitude, period, frequency, phase shift, and midline of a sinusoidal function y = AĀ·sin(Bx + C) + D instantly.
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Haversine Distance CalculatorCalculate the great-circle distance between two latitude/longitude points using the Haversine formula. Results in km, miles, and nautical miles.
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Vector Components CalculatorConvert a vector's magnitude and angle into x and y components instantly. Supports degrees or radians using x = rĀ·cos(Īø), y = rĀ·sin(Īø).
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Angle to Percent Grade CalculatorConvert a slope angle in degrees to percent grade instantly. Enter the angle and get the grade (%) and rise-per-run ratio using grade = tan(Īø)Ā·100.
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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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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 = ā(aĀ² + bĀ² ā 2abĀ·cos C).
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Triangle Area (SAS) CalculatorFind the area of a triangle from two sides and the included angle (SAS) using A = Ā½Ā·aĀ·bĀ·sin C. Enter sides a, b and angle C in degrees.
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Special Angles Trig Values CalculatorFind exact sin, cos and tan values for the special angles 0Ā°, 30Ā°, 45Ā°, 60Ā° and 90Ā°. Instant trig table with decimals like sin45=ā2/2.
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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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Slope to Angle CalculatorConvert a slope (rise/run) to an angle in degrees using Īø = atan(m). Enter rise and run to get the incline angle, slope ratio, and grade percent.
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Angle Between Two Lines CalculatorFind the angle between two lines from their slopes (mā, mā) using the tangent formula. Get both the acute and obtuse angles in degrees instantly.
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Slope to Degrees CalculatorConvert a slope value (m = rise/run) to an angle in degrees. Free slope-to-degrees calculator using angle = atan(m), with radians and percent grade.
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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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Vector Magnitude CalculatorCalculate the magnitude (length) of a 2D or 3D vector from its x, y, z components using |v| = ā(xĀ²+yĀ²+zĀ²). Fast and accurate.
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Resultant Vector CalculatorAdd 2 or 3 vectors by their X and Y components to find the resultant vector's magnitude and direction angle Īø. Free, instant 2D vector addition.
Frequently asked questions
What trigonometric calculations can I find here?
The collection covers the core trig functions ā sine, cosine, tangent, and their inverses (arcsin, arccos, arctan) ā plus the Law of Cosines for non-right triangles and a full Right Triangle Calculator that solves for any unknown side or angle from just two known values.
How accurate are the trigonometry results?
All tools use standard trigonometric definitions and are tested against established reference values, making them dependable for coursework. For structural engineering, surveying, or any safety-critical application, verify your calculations against the governing standard and have a qualified engineer review the work.
Is there a fee to use these calculators?
Every trigonometry calculator here is completely free with no sign-up or subscription required. Open any tool, enter your angle or side values, and get the result instantly. No registration is needed.
Does the site log or save my inputs?
No ā all calculations run locally in your browser. Nothing you type is sent to our servers, stored, or shared with any third party. Close the page and your entries are gone.
Which trig calculators are the most popular on the site?
The list is ranked by actual visitor usage, so the most popular tools appear at the top. The Trending tab shows which calculators are seeing the most activity right now, and Recently Added surfaces the newest tools in the collection.
