Mathematics, Statistics & Geometry

Distance Formula Calculator

Calculate the Euclidean distance, midpoint, and slope between any two (x, y) coordinates. Shows the full Pythagorean derivation step by step.

Distance
5
Midpoint(1.5, 2)
Slope (m)1.3333
Calculation StepsPoint 1 = (0, 0) Point 2 = (3, 4) Distance Formula: d = √((x₂ - x₁)² + (y₂ - y₁)²) d = √((3 - 0)² + (4 - 0)²) d = √(3² + 4²) d = √(9 + 16) = √25 d = 5.000000

Calculated locally in your browser. Fast, secure, and private.

The Distance Formula Calculator is the perfect companion for geometry students and CAD designers. It doesn't just calculate the straight-line distance between two points; it fully analyzes the line segment, providing the midpoint and the slope.

d=(x2−x1)2+(y2−y1)2\begin{aligned} d = \sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2} \end{aligned}

Where:
d=
The straight-line length between the two points
(x1,y1)(x_1, y_1)=
The coordinates of the starting location
(x2,y2)(x_2, y_2)=
The coordinates of the ending location

A Pythagorean Disguise

The distance formula often looks intimidating to new algebra students, but it is nothing more than the Pythagorean Theorem. If you draw a right triangle connecting your two points:

  • The base of the triangle is the horizontal distance: $\Delta x = x_2 - x_1$
  • The height of the triangle is the vertical distance: $\Delta y = y_2 - y_1$
  • The hypotenuse is the direct distance $d$. Therefore, $d^2 = (\Delta x)^2 + (\Delta y)^2$.

Practical Applications

  • Video Game Development: Calculating the distance between the player and an enemy to trigger aggro behaviors.
  • Logistics: Finding the "as the crow flies" straight-line distance between two delivery coordinates.
  • Surveying: Determining the exact boundary lengths of property plots.

Frequently Asked Questions

The distance formula is actually just the Pythagorean theorem (a² + b² = c²) applied to a Cartesian coordinate graph. The 'a' and 'b' are the differences in the x and y coordinates.

No. Because the differences are squared, the negative signs disappear. (x2 - x1)² is exactly the same as (x1 - x2)².

No. Distance is a scalar magnitude representing a physical length. The square root function always returns a positive value.

The midpoint is the exact average of the coordinates. Add the x-values and divide by 2, then add the y-values and divide by 2.

If the x-coordinates are the same, the line is perfectly vertical. The distance is simply the absolute difference between the y-coordinates, and the slope is undefined.

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