Sin Cos Converter
Last updated: June 2026 · Free · No sign-up required
Enter values above and click Calculate to see your result instantly.
Inside the Sin Cos Converter
Behind the inputs above sits one rule: sin²θ + cos²θ = 1; tanθ = sinθ ÷ cosθ; rad = deg × π/180. The tool evaluates it instantly with the values you enter.
Scroll past the converter for a quick-reference table, a step-by-step methodology with a fully worked example, and answers to the questions people most often ask about sin cos calculator.
Quick reference
| Angle | sin | cos | tan |
|---|---|---|---|
| 0° | 0 | 1 | 0 |
| 30° | 0.5 | 0.8660 | 0.5774 |
| 45° | 0.7071 | 0.7071 | 1 |
| 60° | 0.8660 | 0.5 | 1.7321 |
| 90° | 1 | 0 | undefined |
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Below the calculator we link a small set of plain-English explainer pages — "What is a percentage?", "Why does PEMDAS matter?", and so on. They cover the underlying concept in 4–6 short paragraphs. Read those before the calculator if the topic is new, or after if you want the extra context.
Interpretation guide
| Quadrant | Signs (sin / cos / tan) |
|---|---|
| 0–90° | + / + / + |
| 90–180° | + / − / − |
| 180–270° | − / − / + |
| 270–360° | − / + / − |
Formula & methodology
Formula: sin²θ + cos²θ = 1; tanθ = sinθ ÷ cosθ; rad = deg × π/180
- Enter the angle and choose degrees or radians.
- Degrees convert to radians (× π/180) internally.
- sin, cos, and tan are evaluated together.
- tan shows “undefined” at 90°, 270°… where cos = 0.
Example: 30° = 0.5236 rad → sin = 0.5, cos = 0.8660, tan = 0.5774.
Frequently asked questions
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