Sine Calculator

Calculate sin(θ) with exact values for common angles, DEG/RAD toggle, related trig values, and quadrant info.

Angle

Updates as you type

Quick pick

Angle value

Angle (θ) ? —

−360°−180°0°180°360°

Unit ?

Click a row to fill

Deg	Rad	sin	cos	tan	cot

Definition: sin(θ) = opposite / hypotenuse

Unit circle: sin(θ) = y-coordinate of the point on the unit circle

θ: The angle, measured in degrees or radians.
sin(θ): The ratio of the opposite side to the hypotenuse in a right triangle.
Range: sin(θ) ∈ [−1, 1] for all real θ.
Period: sin(θ) repeats every 360° (2π radians).

Sine value

— sin(30°)

Move the slider to see the unit circle update in real time.

cos(θ)

—

tan(θ)

—

cot(θ)

—

y-projection = sin(θ)

sin θ (y) cos θ (x)

Period = 360°

0°90°180°270°360°

Quadrant

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Reference angle

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Degrees

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Radians

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Coterminal

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