m vs my, What's the Difference?

Which to use

“m” is a character and “my” is a determiner - they look or sound alike but fill different roles in a sentence.

#401
“m” frequency rank: #27
“my” frequency rank: 428
confusion score

Side-by-Side Comparison

Feature	m	my
Definition	The thirteenth letter of the English alphabet, called em and written in the Latin script.	First-person singular possessive determiner. See Appendix:Possessive#English.

Where the eye mixes m and my

Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.

1 ch

2 ch

Why the eye confuses m with my

These two trip readers on the page rather than in the ear: m is /ɛm/ while my is /maɪ/. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 extra letter(s) - “m” sits inside “my”, and the parts of speech differ too (character vs determiner), which is usually the fastest check. Our composite confusion score for this pair is 428, derived from the frequency rank of both members and their visual similarity.

m is recorded at frequency rank #401, classified as acharacter, pronounced /ɛm/. my is at rank #27, tagged as adet, pronounced /maɪ/.

Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.

With a confusion score of 428, this pair ranks #529,438 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of m vs my

Shared letters: m. Private to "m": -. Private to "my": y.

"m" · 1 letters · shape C · "my" · 2 letters · shape CV

Frequently Asked Questions

Can "m" and "my" be used interchangeably?

No - they are not even the same part of speech. "m" is a character and "my" a determiner, so a sentence built for one is usually ungrammatical with the other.

Which is more common, "m" or "my"?

"my" is the more common of the two: it sits at frequency rank #27 in our English list, against #401 for "m". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Useful next steps

Eye-level mix-up between "m" and "my" is sorted above. Next: full entries or other pairs that share a letter shape.

Full dictionary entry for "m" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "my" - compare definitions side by side with the headword page. Word entry
This pair ranks #529,438 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"m" and "my" also get mixed up with nearby pairs, the highest-scored neighbour is "m vs MMP". Nearby pair

Confusion rank #529,438 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.