Transmasculine

Transmasculine describes people who were assigned female at birth and whose gender identity or presentation runs toward the masculine. Like its mirror term transfeminine, it names a direction rather than a destination, which lets it cover trans men and masculine-leaning non-binary people in one word without forcing either group to accept the other's label.

Definition & scope

The Diversity Style Guide's definition is the standard one: a person assigned female at birth who identifies with a masculine gender identity more than a feminine one. It notes explicitly that the word is not synonymous with trans man — it takes in non-binary, gender-fluid and genderqueer people assigned female at birth whose gender leans masculine, some of whom would reject man outright.

The boundary that causes most confusion is not with trans man but with butch. Butch is a masculine presentation within womanhood, generally within lesbian communities; transmasculine is not a way of being a woman. The two can look identical from outside and are entirely different from inside, which is precisely why presentation is a poor guide to identity. The same applies to tomboy, which describes a childhood presentation and predicts very little.

As everywhere in this vertical, the term says nothing about attraction — that runs on its own axis, catalogued in the orientations vertical.

History & origins

The term is a back-formation in effect if not in form: the feminine half of the pair is attested first, and transmasculine arrives to complete it.

• 1985: transfeminine is first attested in the community magazine TV-TS Tapestry.
• 1999: the Oxford English Dictionary's earliest evidence for transmasculine comes from the Village Voice — fourteen years later, and the point at which the two words become a matched pair.
• 2000s–2010s: usage spreads as non-binary vocabulary differentiates and a directional term is needed that does not presuppose a binary endpoint.
• 2021: the Diversity Style Guide publishes entries for both terms in January, marking their arrival in mainstream editorial guidance.
• 2020s: the clipped transmasc becomes the ordinary informal form.

The lag between 1985 and 1999 is itself informative. The mid-century clinical and community literature was overwhelmingly concerned with people assigned male at birth, and the vocabulary for the other direction arrived later because the attention did.

In practice

The word earns its keep in settings where the direction of transition is the operative fact: healthcare, peer support, and research categories that need to describe a population without adjudicating each member's identity. Testosterone, chest surgery and the screening questions that follow from a particular anatomy apply to a group that does not map onto man, and this is the term that names that group.

It also makes a real distinction visible inside the trans population. Transmasculine and transfeminine people meet different versions of the same difficulties — different medical pathways, different patterns of public hostility, different ages at disclosure — and the 2022 U.S. Transgender Survey reports along these lines for that reason, splitting non-binary respondents by sex assigned at birth rather than pooling them.

Psychology

No diagnosis attaches to the term. The DSM-5 diagnoses gender dysphoria, meaning distress rather than identity, and the ICD-11 removed the category from its mental-disorders chapter in 2019, re-siting gender incongruence under conditions related to sexual health. A transmasculine person without distress has no diagnosis under either.

The research literature usually studies trans men and non-binary people separately rather than as one transmasculine group, so findings published under the umbrella label are frequently findings about trans men with the heading changed. The gap is worth naming rather than papering over.

Prevalence & culture

How common is transmasculine identity?

No survey asks about the term, so the figure here is built from two that ask adjacent questions, and it is a derivation rather than a count.

The Williams Institute's August 2025 estimate puts 2.1 million US adults — 0.8% — in the transgender population, divided into near-equal thirds: 34.2% (730,500) transgender men, 32.7% (698,500) transgender women and 33.1% (707,100) transgender non-binary adults. The transgender-men third is about 0.27% of all adults on its own. The non-binary third then has to be apportioned, and the 2022 U.S. Transgender Survey shows it leaning heavily one way: 30% of respondents were non-binary and assigned female at birth against 8% non-binary and assigned male at birth, so roughly four fifths of that third is transmasculine, adding about 0.21%. The total is about 0.48% of adults.

That makes transmasculine the larger half of the pair, and the whole of the difference comes from the non-binary third, not from the binary categories, which are near-identical in size. The caveats are the same in both directions: the USTS is a large convenience sample rather than a population survey, so its assigned-at-birth split is indicative only, and not everyone counted here would use the word about themselves. Gallup's 2025 tracking survey puts total transgender identification at 1.3% of US adults, the ceiling both halves have to fit under.