Math
Distance Formula Calculator
Use this distance formula calculator to measure the straight-line distance between two points in the coordinate plane.
Try an example
Result
Distance
—
- Delta x
- —
- Delta y
- —
- Squared distance
- —
Student quick launch
Grade planning, algebra checks, and formulas students reach for most.
Study path
Use this calculator with
Follow these when you want the formula behind the answer, a short lesson, or nearby tools in the same topic.
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.
About this calculator
- Written by
- mathcheck editorial team
- Last reviewed
- May 15, 2026
Method
- Uses the values entered by the user and stable formulas documented on the page.
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Last updated: May 15, 2026