Math & Scientific
Trigonometry Calculator
Trigonometry: it computes sine, cosine and tangent for the angle you enter, in degrees or radians. Worked through below with real figures, and the calculator repeats the working on your own inputs — free, on-device, instant.
Trigonometry Calculator helps you work through a calculation. Enter your angle value and unit and it returns the result instantly, right in your browser with nothing uploaded.
About this calculator
It computes sine, cosine and tangent for the angle you enter, in degrees or radians. It matters when you need the exact relationship checked quickly rather than worked through by hand. Worked below as Enter 30 degrees: sin(30°) = 0.5, cos(30°) ≈ 0.8660254 and tan(30°) ≈ 0.5773503. The form computes ratios from a known angle; it does not infer an unknown angle from side lengths. — and the calculator on this page repeats exactly that working for your inputs, instantly, and offline after load.
How to use
- Enter the angle you want the ratios for.
- Select the angle unit (degrees or radians).
- Press Calculate to compute the ratios.
- Read the sine, cosine, and tangent values.
Why use Trigonometry Calculator
Fast
Calculations run in your browser. No round trip to a server.
Private
Your inputs never leave your device. Nothing is uploaded.
Free
No signup, no paywall, no ads-in-results, no watermarks.
Accurate
Uses standard formulas where applicable; check critical results before relying on them.
Mobile-ready
Optimised for phones, tablets, and desktops alike.
Transparent
Honest disclaimers wherever browser limits or regional rules apply.
Common uses
Use it when revising for exams
Use it for verifying answers from a textbook
Use it when comparing two different methods
Use it for double-checking a spreadsheet result
Trigonometry in statistics and data coursework
Use it for homework and assignment checks
Technical notes
In degree mode, tangent is undefined at exact odd multiples of 90°. Nearby angles have a finite approximation, with a warning when the result is highly sensitive to input rounding. Radian entries are decimal approximations: a typed decimal close to π/2 is not an exact symbolic π/2. The result retains the parsed angle instead of rounding a nearby input to 90. Large angles remain subject to JavaScript number precision; reduce them using reliable source precision before calculation.
Trigonometry Calculator computes sine, cosine and tangent for the angle you enter, in degrees or radians.
Inputs are taken exactly as entered, so check for typos before trusting an answer.
Because it runs locally, results appear instantly with no server round-trip.
FAQ
What is the sine of 45 degrees?
The sine of 45 degrees is about 0.7071, the same value as the cosine of 45 degrees.
Why is tangent not defined at certain angles?
Tangent is sine divided by cosine, so wherever cosine is zero, such as 90 and 270 degrees, the tangent is not defined.
Are the results exact or rounded?
Results are numerical approximations rounded for display. Degree mode identifies exact tangent poles, while values close to a pole can be highly sensitive to input rounding.
Does the Trigonometry Calculator send my data to a server?
No. The Trigonometry Calculator runs entirely in your browser, so nothing you enter is uploaded, stored, or shared.
Worked example
Enter 30 degrees: sin(30°) = 0.5, cos(30°) ≈ 0.8660254 and tan(30°) ≈ 0.5773503. The form computes ratios from a known angle; it does not infer an unknown angle from side lengths.