whats the most common blood type

The most common blood type in the world is O positive (O+).

Quick Scoop

• Globally, more than one-third of people are estimated to have O positive blood, making it the most frequent blood type overall.

• In many countries (like the U.S. and several European nations), O positive is also the single most common blood type in the population.

• O positive blood is especially important for transfusions because it can be given to any Rh‑positive patient (A+, B+, AB+, O+), so hospitals keep large supplies of it on hand.

Knowing your own blood type is useful for emergencies, donating blood, and sometimes for pregnancy care and medical planning.

TL;DR: When people ask “what’s the most common blood type,” the answer is O positive.