Midpoint of Two Points (2D)

How it is calculated

For points (x1, y1) and (x2, y2) the tool averages each coordinate separately: Mx = (x1 + x2) / 2 and My = (y1 + y2) / 2. It also gives the segment length √((x2 − x1)² + (y2 − y1)²). All four coordinates are required; any real number is accepted, including negatives and decimals. The tool is unit-free, so the length comes back in whatever unit your coordinates use. Everything is rounded to two decimals. The calculation is for flat Cartesian coordinates; for latitude and longitude over long distances, a straight average is only a rough approximation of the geographic midpoint.

Common mistakes

• Adding the coordinates but forgetting to divide by 2, which gives the sum point (4, 12) rather than the midpoint.
• Mixing up the pairs, for example typing (x1, x2) in the first row and (y1, y2) in the second.
• Losing a minus sign, or subtracting incorrectly when a coordinate is negative: 6 − (−2) is 8, not 4.
• Reading the length result as the distance from the origin; it is the distance between the two points entered.