Math
Distance Formula Calculator
Use this distance formula calculator to measure the straight-line distance between two points in the coordinate plane.
Distance
—
- Delta x
- —
- Delta y
- —
- Squared distance
- —
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Study path
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What the distance formula calculator solves
Use this distance formula calculator to measure the straight-line distance between two points in the coordinate plane.
Formula
How to use it
- Enter the first point.
- Enter the second point.
- Read dx, dy, squared distance, and final distance.
How to read the answer
The distance formula is the Pythagorean theorem applied to horizontal and vertical coordinate changes.
Common mistakes and edge cases
- Subtract coordinates in the same order for both dx and dy.
- Square before adding.
- Distance is never negative.
Worked examples
Positive coordinates
Distance
10
Same point
Distance
0
Frequently asked questions
Is this the same as the Pythagorean theorem?+
Yes. The coordinate differences form the legs of a right triangle.
Can coordinates be negative?+
Yes. Negative and decimal coordinates work because the differences are squared.
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Last updated: May 15, 2026