Cosine Calculator Online (Radians)
What you can expect
Calculate the cosine of an angle entered in radians.
Cosine (Radians)
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Frequently asked questions
- Why does this tool take radians instead of degrees?
- Most math libraries and formulas use radians natively. If your angle is in degrees, convert it first with the Degrees to Radians tool.
- What is cos(0) and cos(π)?
- cos(0) = 1 and cos(π) = -1 — cosine starts at its maximum and reaches its minimum after half a turn.
- What is the range of cosine values?
- Cosine always returns a value between -1 and 1, no matter the input angle.
- Is this tool free to use?
- Yes — completely free, no account needed. Everything is calculated entirely in your browser and never uploaded to a server.
For developers
Use Cosine (Radians) from Python
Open the Jupyter notebook example to see how to run this tool from the BrushCue Python API, inspect the processing steps, and adapt the workflow for scripts or batch image jobs.
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