About this tool
Enter an angle in degrees or radians to get its sine, cosine and tangent. A second section takes a value and returns its inverse sine, cosine and tangent. Everything updates live in your browser.
Frequently asked questions
Can I use radians instead of degrees?
Yes. Each section has a unit toggle, so you can enter the angle in degrees or radians and choose the output unit for the inverse functions.
Why is tangent sometimes undefined?
Tangent is sin÷cos, which is undefined where cosine is zero (such as 90°). Likewise asin and acos only accept values between −1 and 1.