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Both calculators run independently — change the inputs on either side to compare results.

Angle Between Vectors Calculator

Compute the angle in degrees between two 2D vectors using cos θ = (v1·v2)/(|v1|·|v2|) and the arccosine function. The result lies in [0°, 180°] regardless of vector orientation.

Vector 1 - X component

Vector 1 - Y component

Vector 2 - X component

Vector 2 - Y component

Fill in the required fields to see your result.

Linear Algebra

Vector Projection Calculator

Calculate the scalar projection of 2D vector A onto vector B. Use this when you need to find how much of vector A lies in the direction of vector B.

Vector A - X component

Vector A - Y component

Vector B - X component

Vector B - Y component

Fill in the required fields to see your result.

Key differences

	Angle Between Vectors Calculator	Vector Projection Calculator
Category	Linear Algebra	Linear Algebra
Inputs required	4	4
Result	Angle Between Vectors (degrees)	Scalar Projection
What it does	Compute the angle in degrees between two 2D vectors using cos θ = (v1·v2)/(\|v1\|·\|v2\|) and the arccosine function. The result lies in [0°, 180°] regardless of vector orientation.	Calculate the scalar projection of 2D vector A onto vector B. Use this when you need to find how much of vector A lies in the direction of vector B.