km vs koi, What's the Difference?

Which to use

“km” is a symbol and “koi” is an adjective - they look or sound alike but fill different roles in a sentence.

#1,030
“km” frequency rank: #29,838
“koi” frequency rank: 30868
confusion score

Side-by-Side Comparison

Feature	km	koi
Definition	Symbole du kilomètre, unité de mesure de longueur du Système international (SI), valant 1000 mètres (10³ mètres).	Autre orthographe de koï (race de carpe du Japon, aussi appelée carpe japonaise).

Letter map: km vs koi

Shared letters muted; letters that set km and koi apart highlighted. Shared run: 1.

2 ch

3 ch

koi

Role in the sentence - km and koi

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: km is asymbol and koianadjective. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 30868, derived from the frequency rank of both members and their visual similarity.

km is recorded at frequency rank #1,030, classified as asymbol. koi is at rank #29,838, tagged as anadj, pronounced \kɔj\.

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 30868, this pair ranks #307,490 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of km vs koi

Shared letters: k. Private to "km": m. Private to "koi": io.

"km" · 2 letters · shape CC · "koi" · 3 letters · shape CVV

Frequently Asked Questions

Do "km" and "koi" mean the same thing in a sentence?

No - they are not even the same part of speech. "km" is a symbol and "koi" an adjective, so a sentence built for one is usually ungrammatical with the other.

In ordinary French text, does "km" or "koi" show up more?

"km" is the more common of the two: it sits at frequency rank #1,030 in our French list, against #29,838 for "koi". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Useful next steps

Done with this confusable. These links stay specific to "km" and "koi".

Full dictionary entry for "km" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "koi" - compare definitions side by side with the headword page. Word entry
This pair ranks #307,490 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
"km" and "koi" also get mixed up with nearby pairs, the highest-scored neighbour is "koi vs ky". Nearby pair

Confusion rank #307,490 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.