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Distance Formula Calculator

Online distance calculator: enter two points and apply d=√((x₂−x₁)²+(y₂−y₁)²) from the Pythagorean theorem.

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d=√((x₂−x₁)²+(y₂−y₁)²)
Point 1
x
y
Point 2
x
y

📖 Tutorial | Distance

1. Definition
For two points, d=√((x₂−x₁)²+(y₂−y₁)²), from the Pythagorean theorem.
2. Formula & Notation
PointsCoordinates
3. Properties & Laws
  • Distance formula;
  • Add Δz² in 3D;
  • Always non-negative;
  • Coincident gives 0.
4. Steps
  1. Enter two points;
  2. Click "Distance";
  3. Or click "Load Example".
5. Worked Examples
Example: (0,0),(3,4): d=5.
6. Common Pitfalls
Square then root;
Order does not matter;
Include z in 3D.

❓ FAQ | Distance

Formula?
√(Δx²+Δy²).
From?
Pythagoras.
3D?
Add Δz².
Negative?
Never.
Coincident?
0.
Differences?
Δx = x₂−x₁ and Δy = y₂−y₁.