What's the difference between 2D and 3D mode?

3D mode adds a z-coordinate and the corresponding (z2−z1)² term under the square root, for distance through 3D space rather than a flat plane.

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Math & Everyday

Distance Calculator

Straight-line distance between two points, in 2D or 3D.

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About the Distance Calculator

Computes the straight-line distance between two points, in 2D or 3D, using the Euclidean distance formula.

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How to use it

Choose 2D or 3D.
Enter both points' coordinates.
The straight-line distance between them is computed instantly.

Formula

distance = √((x2−x1)² + (y2−y1)²), or with a z-term added for 3D

Worked example

The points (0,0) and (3,4) are exactly 5 units apart — the classic 3-4-5 right triangle.

Interpreting your result

This is straight-line ("as the crow flies") distance between coordinates, not a travel distance.

Frequently asked questions

No — this is plane (Cartesian) distance for flat x/y coordinates. Latitude/longitude distance needs a great-circle formula (e.g. Haversine), which this tool doesn't compute.