MBTI Type Percentages: A U.S. English Reference Sample

The report labels this U.S. English supplement 2018. It describes a reference sample of 3,578 people recruited through a market research firm with demographic targets based on U.S. Census data. The report does not state the dates when data were collected. This is not a global distribution, a current census, or a breakdown of MBTI USA site users.

The table reproduces Table 3 of the supplement: counts (n) and rounded percentages for each reported type, with N=3,578. The rounded percentages sum to 100.1%. The report concerns the MBTI Global Step I assessment. It says that best-fit type data were collected but are not reported in this supplement; these results therefore should not be described as best-fit type frequencies.

The supplement describes the MBTI Global Step I as a 92-item assessment based on a 230-item research form. Its reported type table is tied to that instrument and reference sample. The 2018 label identifies the supplement, not a known fieldwork year; the collection dates are not disclosed.

Other reports may show different percentages because they use different instruments, forms, samples, or scoring and reporting methods. Do not combine those figures into one distribution unless their populations and methods are comparable. These sample percentages also do not predict an individual’s type or say what type a particular person should receive.

MBTI USA offers its own independent MBTI-style self-reflection test. It is not the official MBTI assessment, and this page’s figures were not calculated from this site’s test takers.