# Trigonometry Calculator

> Calculate sine, cosine, tangent and their inverses in degrees or radians.

To calculate trigonometric values, enter an angle in degrees or radians and sine, cosine, tangent and their reciprocals are computed. Undefined values such as tangent at 90 degrees are reported as undefined rather than as a misleading very large number.

**URL:** https://convertto.tech/t/trigonometry-calculator
**Category:** Calculators (https://convertto.tech/c/calculators)
**Privacy:** Runs entirely in the browser; no upload
**Cost:** Free, no sign-up
**Last updated:** 2026-08-01

## Key facts

- **Privacy:** Runs entirely in your browser — nothing is uploaded
- **Cost:** Free, unlimited, no sign-up

## How to use

1. Set the angle.
2. Choose the unit.
3. The result appears immediately — copy or download it.

## FAQ

### When should I use degrees rather than radians?

Degrees for surveying, navigation and anything a person reads. Radians for calculus and programming — every trigonometric function in every major language expects radians, and passing degrees is one of the most common numerical bugs there is.

### What is a radian, physically?

The angle at which the arc length equals the radius. A full circle is 2π radians because the circumference is 2π times the radius — the unit falls out of the geometry rather than being chosen.

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