Free Trigonometry Calculator 2026 — Sin Cos Tan Online

Calculate all trigonometric functions online for free: sin, cos, tan, csc, sec, cot, and their inverses (arcsin, arccos, arctan). Supports both degrees and radians. Key values: sin(30°) = 0.5, cos(60°) = 0.5, tan(45°) = 1. Use this calculator for geometry, physics, engineering, and math homework. Enter any angle to get all six trig functions instantly. No sign-up required — your data never leaves your browser. Works instantly on desktop, tablet, and mobile. Completely free with no daily usage limits, no watermarks, and no account needed. Trusted by students, professionals, and businesses worldwide. FixFlowHub is a browser-based toolbox with 120+ free utilities covering PDF, image, text, calculator, and productivity tools.

Frequently Asked Questions

What are the basic trigonometry formulas?

The three primary trig functions: sin(θ) = opposite/hypotenuse, cos(θ) = adjacent/hypotenuse, tan(θ) = opposite/adjacent (or sin/cos). The three reciprocal functions: csc(θ) = 1/sin(θ), sec(θ) = 1/cos(θ), cot(θ) = 1/tan(θ). The Pythagorean identity: sin²(θ) + cos²(θ) = 1.

What is the value of sin 45 degrees?

sin(45°) = √2/2 ≈ 0.7071. Other key values: sin(0°) = 0, sin(30°) = 0.5, sin(60°) = √3/2 ≈ 0.866, sin(90°) = 1. These values are commonly memorized for geometry and physics calculations.

Related free tools

More free calculators