MgvsmmWhat's the difference?

Which to use

“Mg” and “mm” are a confusable French pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#10,743
“Mg” frequency rank
#1,092
“mm” frequency rank
11835
confusion score

Side-by-Side Comparison

Feature Mg mm
Definition Symbole chimique du magnésium. Symbole du millimètre, unité de mesure de longueur du Système international (SI), valant 0,001 mètre (10⁻³ mètre).

Letter map: Mg vs mm

Shared letters muted; letters that set Mg and mm apart highlighted. Shared run: 1.

2 ch
Mg
2 ch
mm

Corpus notes: Mg and mm

Mg and mm are indexed as a confusable French pair. We have no recorded pronunciation or part of speech for both members, so the spelling overlap is what we can show you: they differ by a single letter - g in “Mg” becomes m in “mm”. Our composite confusion score for this pair is 11835, derived from the frequency rank of both members and their visual similarity.

Mg is recorded at frequency rank #10,743, classified as asymbol. mm is at rank #1,092, tagged as asymbol, pronounced \mi.li.mɛtʁ\.

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 11835, this pair ranks #407,632 of 440,172 scored French confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of Mg vs mm

Shared letters: m. Private to "Mg": g. Private to "mm": -.

"Mg" · 2 letters · shape CC  ·  "mm" · 2 letters · shape CC

Frequently Asked Questions

Is swapping "Mg" for "mm" ever safe?
No. They differ by a single letter - g in “Mg” becomes m in “mm”, but the dictionary glosses above give them different meanings, so swapping one for the other changes what the sentence says.
In ordinary French text, does "Mg" or "mm" show up more?
"mm" is the more common of the two: it sits at frequency rank #1,092 in our French list, against #10,743 for "Mg". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

What to do next

You've compared "Mg" and "mm". Here's where to go from here.

  • Full dictionary entry for "Mg" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "mm" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #407,632 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
  • "Mg" and "mm" also get mixed up with nearby pairs, the highest-scored neighbour is "Mg vs MWh". Nearby pair

Confusion rank #407,632 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list