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割合 and 率 both mean ratio, rate, and percentage. What is the difference?
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2011-08-24T02:27:25.147
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2011-08-25T07:59:05.233
2011-08-24T06:09:21.787
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word-choice usage vocabulary nuances kanji
Difference between  割合 vs 率
Neither means percentage. Percentage is one hundred times ratio or rate. The
Japanese word for it is `百分率`. Likewise, permillion is one million times ratio
or rate. The Japanese word for it is `百万分率`.

My impression is that `割合` and `ratio` are the general terms for a quantity
divided by another quantity (usually but not always of the same dimension).
`率` and `rate` are especially for cases where its lowness or highness is
connected to its preferred amount in an ideal situation. For example, `率` or
`rate` is used for `誤差~` or `error ~` because the ideal case would be zero. It
can be also used for `正解~` or `correctness ~` because the ideal situation will
be one. It is also used in `転送~` or `bit ~` because the larger the better.
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2011-08-24T11:46:31.657
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2011-08-24T11:46:31.657
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these two words literally share the similar meanings of ratio,rate.
translation of the the explaination from the [yahoo 知惠袋
website](http://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q1410443619)

割合 normally is used to refer to the proportion of sth,the relationship of one
thing to another in size, amount, etc.

eg: 1. The proportion of men to women in the college has changed dramatically
over the years. 近年学校の男女の割合を大きく変化しています。

```

     2. Limestone and clay in the proportion 2: 1.  
    石灰石と粘土の割合は２対１also :
    石灰石と粘土の比率は２対１
    
```

率 is often used after a sort of noun in order to express the percent of
...;for instance percentage "百分率", percent of pass "合格率", percent of
attendance "出勤率" etc. and as mentioned above, when use with "比" as"比率",
比率shall substitute "割合".
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2011-08-25T07:59:05.233
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answer