Trigonometry calculators
Angles, ratios, and triangle laws, every answer verified by a real calculation engine.
What trigonometry helps you solve
Trigonometry connects angles with side lengths in triangles, and it extends to waves, rotation, and circles. It is used in navigation, surveying, engineering, physics, and computer graphics, wherever direction, height, or distance matters. These calculators focus on the core skills students meet first: finding trig ratios for an angle and solving a triangle when the usual right triangle methods are not enough.
Pick a tool below, enter the values you know, and follow the step by step working to the result. Checking which mode you are in, degrees or radians, before you start will prevent the most common errors, and the steps make it easy to spot where a hand calculation went wrong.
Tools in this category
- Sine, cosine and tangent – Compute sine, cosine, tangent, and their reciprocals for any angle in degrees or radians.
- Law of cosines – Find a missing side or angle in any triangle using two sides and the included angle, or all three sides.
Frequently asked questions
It finds heights, distances, and angles that are hard to measure directly, such as the height of a building from its shadow. It also describes repeating motion, sound, and light waves.
Use degrees for most school geometry and everyday angles. Use radians for calculus and advanced work. A full turn is 360 degrees, which equals 2 pi radians, so 180 degrees equals pi radians, about 3.1416.
Sine is opposite over hypotenuse, cosine is adjacent over hypotenuse, and tangent is opposite over adjacent. For a 30 degree angle, sine is 0.5.