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There's a similar question here:

[Katakana words with Kanji. How did that
happen?](https://japanese.stackexchange.com/questions/6158/katakana-words-
with-kanji-how-did-that-happen)

# Question

> Some words are written with katakana, but also have kanji. For example:
```

>     コーヒー　珈琲
>     ページ　頁
>  
```

>
> How did this happen? They are loanwords, but no doubt had Japanese
> equivalents before these variants were imported. Is that the case? And are
> these original words now forgotten?

# Answer

>
```

>     had Japanese equivalents before the English variants were imported
>  
```

>
> Coffee is not native to Japan, and did not have an equivalent; that kanji
> sequence is ateji.
>
> "Page" is that kanji, but it's properly pronounced 「けつ」 in sequences.

My question is though how often does Katakana-based words have an equivalent
Kanji?
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katakana
How often will a katakana term have an equivalent kanji spelling?
The only example I can think of that is in common use is tobacco. I remember
being impressed tobacco was so successful in entering the Japanese language
unlike all the other katakana words. I think it's たばこ、煙草 but it'd be safer to
check at コンビニ .
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Words that are often written in katakana but have kanji available tend to fall
into several groups. These are the sorts of words I find when I look for words
meeting these criteria in Jim Breen's EDICT and such:

  1. Recent loans from Chinese languages, reflecting modern pronunciation:

    * Food words: ザーサイ(搾菜)・ワンタン(雲呑)・マーボー(麻婆)豆腐
    * Numbers: イー(一)・アル(二)・サン(三)・スー(四)
    * Mahjong words: リーチ(立直)・テンパイ(聴牌)
    * Place names: ペキン(北京)
    * Interjections: ニーハオ(你好)・シエシエ(謝々)

Of course, there's other sorts of loan words: クーニャン(姑娘)・ピンイン(拼音)・カンフー(功夫)

  2. Older units given ateji, now often written in kana: メートル(米)・トン(屯)・グラム(瓦)・ページ(頁)

  3. Foreign place names given ateji, now usually written in kana: アメリカ(亜米利加)・イギリス(英吉利)・ロシア(露西亜)・シンガポール（新嘉坡）

Some morphemes made by abbreviating these ateji are still used. For example,
in the word 英語, the first part 英 comes fromg 英吉利.

  4. Other foods given ateji: コーヒー(珈琲)・レモン(檸檬)

  5. Plants and animals which are commonly written in katakana but have kanji available: ハチドリ（蜂鳥）・ホトトギス(杜鵑).

You'll run across some others here and there. Overall, out of the words listed
in EDICT in katakana, around 1% have kanji. But there are a lot of rare ateji
for foreign words that are normally written in katakana. Just take a look at
[this
list](http://kokugo.chu.jp/kotonoha/shiryou_text/gairaigono%20ateji.htm), for
example.

Of course, you should take these numbers with a grain of salt. The category of
"katakana words" isn't at all well defined, and I'm certain there are many
examples of ateji that aren't listed in EDICT. And after all, people can make
new ones any time they want—[like 吐露非狩古鬱, for
example](https://www.youtube.com/watch?v=v7ouW_GAv-w#t=1m14s).

But most of the time, you should expect "katakana words" to be written in
katakana.
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