what shape does a bloodstain make when it falls perpendicular

A blood droplet that falls straight down onto a surface at a perpendicular (90°) angle typically creates a circular stain with fairly even edges.

Basic answer: the stain shape

When blood drops vertically and hits a flat surface at 90°, it keeps a roughly spherical shape in the air and forms a round stain when it lands.

You usually see:

• A circular main stain (width ≈ length).

• Little or no “tail” indicating direction, unlike angled drops.

• Sometimes small satellite stains around the main drop, depending on height and surface texture.

Why it’s circular

Blood behaves as a liquid with surface tension, so a falling drop tends to form a sphere.

When that sphere hits a surface straight on, the energy spreads out evenly in all directions, which produces a circular pattern rather than an elongated one.

For comparison:

• At 90° (perpendicular): round stain.

• At lower angles (more slanted): the stain becomes more elliptical , often with a pointed end showing direction of travel.

Small example scenario

Imagine a single drop of blood falling from a fingertip straight down onto a smooth tile floor:

• It lands with a small, nearly perfect circle, maybe with a thin ringed edge.

• If the height is moderate and the floor is hard, a few tiny satellites might appear around it, but the main spot remains circular.

Information gathered from public forums or data available on the internet and portrayed here.