Trigonometry Calculator
Calculate trigonometric functions — sine, cosine, tangent and their inverses.
The functions of angles
Trigonometry relates the angles of a triangle to the ratios of its sides through the functions sine, cosine and tangent. This calculates those functions and their inverses, the essential tools for anything involving angles and triangles.
Enter an angle or ratio to calculate the trig functions.
From triangles to waves
Trigonometry starts with right triangles — the classic memory aid relates each function to a ratio of sides, sine as opposite over hypotenuse and so on — which is how it is used to find distances and heights you cannot measure directly, from surveying to navigation. But its reach goes far beyond triangles: sine and cosine describe waves and cycles, so they model sound, light, tides, alternating current and anything that oscillates, which is why trigonometry underpins so much of physics and engineering. The one persistent pitfall is degrees versus radians — the same function gives different results depending on which unit the angle is in, so checking the mode is essential. From measuring the inaccessible to describing every wave, trigonometry is one of maths' most far-reaching subjects.
Trigonometry Calculator FAQ
What do sine, cosine and tangent represent?
Ratios of a right triangle's sides relative to an angle — the classic aid is opposite, adjacent and hypotenuse combined as SOH-CAH-TOA.
Why does trigonometry describe waves?
Because sine and cosine trace smooth cycles, so they model anything that oscillates — sound, light, tides and alternating current.
What is the common trig mistake?
Mixing up degrees and radians — the same function gives different results in each, so always check which mode you are in.
Is anything uploaded?
No. The calculation happens in your browser.