About Trigonometry Calculator
Trigonometry Calculator takes a single angle in degrees and returns its sine, cosine and tangent together. Enter 30 and the familiar values come back: a sine of one half, a cosine of about 0.866 and a tangent of about 0.577, each written to six decimal places. It is the quickest way to check a figure against a printed table, or to sanity check an answer before it goes into something else.
The conversion is the standard one. The angle is multiplied by pi and divided by 180 to turn it into radians, and the mathematical functions of the browser are then applied directly, so the results are ordinary double-precision values rather than rounded table figures. There is no unit selector, which means the number is always read as degrees and a value that is already in radians has to be converted before it is entered. Output arrives as three labelled lines, one per function, so the three can be compared without further work.
Two behaviours are worth knowing in advance. The tangent of a right angle is not treated as a special case, so entering 90 fills the tangent line with the enormous value the floating-point function returns close to its asymptote instead of reporting that the tangent is undefined there. And clearing the angle field leaves a zero behind, which produces a sine and a tangent of zero and a cosine of one.
How to use Trigonometry Calculator
- 1 Enter the angle in degrees in the single field - the default is 30.
- 2 Press the calculate button, since the field does not update the result as you type.
- 3 Read the three lines for sine, cosine and tangent, each given to six decimal places.
- 4 Note the answer in radians yourself if you need that form, because only degrees can be entered.
Frequently asked questions
Why does the tangent of 90 give such a huge number?
Because the calculation does not treat that angle specially. The floating-point tangent function returns a very large value close to its asymptote, and the page prints it as though it were an ordinary result instead of reporting that the tangent is undefined at 90 degrees.
Can I work in radians instead of degrees?
No. The single field is always read as degrees and there is no unit switch. If your angle is in radians, multiply it by 180 and divide by pi before entering it.
Where are the inverse functions?
They are not on this page. Only the sine, cosine and tangent of an angle are produced, and there is no arcsine, arccosine or arctangent to turn a ratio back into an angle.
What happens with very large or negative angles?
They are used exactly as typed. There is no limit on the field and no reduction into a single turn, so a value such as 720 is carried straight through the conversion and can return a negative zero rather than a plain one.
Free, online, and private
Free to use
Trigonometry Calculator is completely free. There is no account to create, no login, and no hidden charge or usage limit.
Runs online in your browser
It is a free online tool that runs entirely in your browser. Nothing to download or install — open the page and start using it right away.
Your data stays private
All processing happens locally on your device. Your input is never uploaded, stored, or tracked, so it never leaves your browser.
How Trigonometry Calculator behaves in detail
These are the specifics of this implementation — the exact ranges, defaults and fixed settings you are working with.
| Parameter | Value |
|---|---|
| Input | one number field labelled Angle (degrees), starting at 30; there is no unit switch, so the value is always read as degrees |
| Conversion | the angle is multiplied by pi and divided by 180 before any trigonometric function is applied |
| Output | three lines labelled sin, cos and tan, each written to six decimal places |
| Calculation | each line comes from the platform mathematical sine, cosine and tangent, so the values are the standard double-precision results |
| Empty field | clearing the angle reads it as zero, which gives sin 0.000000, cos 1.000000 and tan 0.000000 |
| Button | the result appears when the calculate button is pressed; the fields do not recalculate as you type |
Compiled from the implementation of this tool and checked against it by itoolnet.
What Trigonometry Calculator does not do
Knowing the edges of a tool saves more time than another list of its features. These are the cases where it will not do what you might expect.
- The tangent at ninety degrees is not treated specially. Typing 90 fills the sine line with 1.000000, rounds the cosine to 0.000000, and then prints a very large number on the tangent line instead of saying that the tangent is undefined at that point. The same happens at 270 and at every odd multiple of 90.
- The angle is used exactly as typed. There is no lower or upper limit on the field and no reduction into a single turn, so a value such as 720 is carried through the conversion and its sine and tangent can come back as a negative zero rather than a plain zero.
- Only three forward functions are covered. There is no arcsine, arccosine or arctangent, no conversion of a ratio back into an angle, no separate output in radians, and no display of the intermediate value of pi that the conversion relies on.
Tested and documented by itoolnet, the team that builds and maintains this site.