Trig Function Calculator

Inputs explained

• Mode — Forward (sin/cos/tan of an angle) or inverse (asin/acos/atan of a value).
• Angle — The angle to evaluate. Tangent is reported as undefined at 90° ± 180°k.
• Angle unit — Degrees or radians, for both input angles and inverse-function outputs.
• Value — For inverse mode: the ratio to invert. Must be between −1 and 1 for asin and acos.

How to use it

1. Fill in the fields above — each input has a hint describing exactly what to enter
2. Press Calculate to get your result instantly, right on this page
3. Copy the result, save the tool to favorites, or share and embed it anywhere

Understanding the result

Example: sin 30° = 0.5, cos 30° ≈ 0.866025, tan 30° ≈ 0.57735.

Frequently asked questions

Why does tangent sometimes return an error or undefined result? Tangent is undefined at 90° and 270° (and their equivalents in radians) because cosine is zero there, which would make the tan calculation a division by zero.

What's the difference between choosing degrees and radians? Degrees and radians are just two units for the same angle (360° = 2π radians), so selecting the wrong unit for your input will produce a mathematically valid but completely different, incorrect-looking result.

Is the Trig Function Calculator free to use? Yes — it is completely free, with no sign-up, no download and no usage limits. You can use it as often as you need.

Is my data private? Yes. The calculation runs entirely in your browser — the values you enter are never sent to our servers, stored or shared with anyone.

What information do I need? Just the following: Mode, Angle, Angle unit, Value. Each field includes a hint explaining exactly what to enter.

Can I use it on my phone? Yes — the tool is fully responsive and works on any device, and the same calculator is available in the EasyWorkCalcs mobile app.

Privacy

Everything you enter into the Trig Function Calculator is processed entirely in your browser. Nothing is uploaded, stored or shared — your data stays on your device.