<p>Tricky that. I think you are right and the dictionaries are wrong!</p>
<p>间隔： gap, interval</p>
<p>隔开: separate</p>
<p>每 间隔 一周 <br/>
every gap 1 week: Something happens week 1, not week 2, again week 3</p>
<p>每 间隔 两天 <br/>
every gap 2 days: Something happens day 1, not day 2, not day 3, again day 4</p>

CC BY-SA 3.0
2017-12-03T17:37:05.933Z
I also feel "每隔" and "每" are not the same. "每隔两天" means "something happens day 1, not day 2, not day 3, again day 4". “每两天” means "something happens day 1, not day 2, again day 3".
cnwang09
CC BY-SA 3.0
2017-12-03T23:32:04.593Z
Agree! Definitely not the same. 每两天一次， every second day 1 time, 每隔两天一次  every third day one time. (really 'after an interval of 2 days again 1 time) . Also the maximum duration of an event in this expression is limited to the time period used, here day. Otherwise we would need a more complicated expression. I often think Chinese is more penetratingly perspicacious than English. "每隔两天"  is a good example.
Pedroski
CC BY-SA 4.0
2020-08-14T10:47:40.323Z
This is over-relying on the literal meaning, rather than how the words are actually used. In practice, as @CounterSpell says in their answer, it's a vague way of saying things.
Lionel Rowe
CC BY-SA 4.0
2017-12-02T23:57:52.697Z
2020-08-13T22:06:14.510Z
2020-08-13T22:06:14.510Z
Pedroski
<p>每隔 means "every". It can be used as "每隔" + quantity + unit.</p>

<p>
For example:
</p>

<p> - every + 2 + days = 每隔+两(2)+天</p>

<p>I drink a cup of coffee every two days. = 我每隔2天喝一杯咖啡。</p>

<p>This means you consume a cup of coffee every 48 hour interval. </p>

<p> - every 500 meters = 每隔 + 五百(500) + 米</p>

<p>I stop every 500 meters. = 我每隔500米停一次。</p>

<p>It means you stop at 500 meters, and stop again when you reach 1000 meters.</p>

<p>In conclusion, as my understanding, "每隔两天" means  "every 2 days"(not 3).
 However, your concern is legit. It is a vague way of saying things. Thus, if it is a more serious situation (e.g. contract), instead of a day to day conversation, you should clarify. </p>

CC BY-SA 3.0
2017-12-03T17:09:01.377Z
Using your formula 每隔 + quantity + unit, this is what I have seen: if quantity=1, then 每隔 + quantity + unit=every x+1 unit; if quantity>1, then 每隔 + quantity + unit=every x unit. I feel I am learning math, not Chinese now. :)
cnwang09
CC BY-SA 3.0
2017-12-03T17:22:31.193Z
If the unit is distance instead of time, then I think it depends on the length of the subject. For example, if the subject is a 100-meter high-speed train and it 每隔500米停一次, then the next time it should stop at 1100 meter, not 1000 meter.
cnwang09
CC BY-SA 3.0
2017-12-03T03:15:37.323Z
2017-12-03T03:15:37.323Z
CounterSpell
<p>As @user6065 said in comment, 每隔X means 'with interval of X', which does not specify duration of the event. </p>

<p>每隔一周 does not necessarily mean 'every two weeks'. If the event takes place for a week every time, which is the common assumption when someone says 每隔一周, then it means that. But it is possible the the event takes only 1 hour, then it means every one week, although people tend to say it in a different way in the first place. </p>

<p>Similarly, 每隔两天 might be used commonly with an event that has one day duration, hence every three days. But again it could be different, e.g. “每隔两天一次，每次10分钟” then it is an inaccurate way of saying every two days. (It is inaccurate because strictly speaking the interval is 2 days less 10 minutes.)</p>

CC BY-SA 3.0
2017-12-03T09:30:52.557Z
I disagree, 每隔一周 does mean "every other week", while 每一周 means "every week".
dan
CC BY-SA 3.0
2017-12-03T17:03:34.883Z
@NS.X Thank you for your input. But I don't think "每隔 X" implies the event lasts for the entire X period of time. For example, the sentence is 他喜欢那家茶馆，一般周三下午去，每隔一周去一次。
cnwang09
CC BY-SA 3.0
2017-12-03T03:55:31.180Z
2017-12-03T03:55:31.180Z
NS.X.
<p>每隔一周 means "every two weeks" or "every other week" in English. So, it looks like “每隔 x” is equivalent to "every x+1" in English.</p>

<p>However, I noticed many online dictionaries have 每隔两天 equivalent to "every two days". But I thought 每隔两天 should be "every three days". Can anyone explain?</p>

CC BY-SA 3.0
2017-12-02T21:23:52.063Z
每隔X at an interval of X in between,  bkrs：每隔 固定间隔一段时间。at intervals of
every (so often)他们每隔三天见一次。 They see each other once every three days.一路公共汽车每隔3分钟就有一班。
There’s a Number One bus every three minutes.
改
每隔四小时喝十滴。
Take ten drops every four hours.
 
墨西哥城大约每隔十年降一次雪。About once in ten years  snow ...
＂汉语水平考试词典＂隔［义２］时间或空间上有离距；间隔（at a distance from;after or at an interval of):～日｜～夜｜你～几天再去｜北京和天津相～一百多公里。
If a particular repetitive eve. lasts for about one 
week, then "at intervals of 1 week" may mean every other week. If an event lasts about a day each time then, 每隔两天
may mean every 3 days.
user6065
CC BY-SA 3.0
2017-12-02T21:43:58.613Z
it does not have to last for a whole time period (week,day) as long as such a period is reserved for it
user6065
CC BY-SA 3.0
2017-12-03T01:24:53.243Z
To avoid any ambiguity may say 每＋数词 ＋ （个）＋ 时期 ＋ 一次，once every + numeral ＋（time period）s （whether or not use CL 个 depends on "时期", 天、年：no 个，月：个，see e。 g。https://chinese.stackexchange.com/questions/27695/whats-wrong-with-%e4%b8%80%e4%b8%aa%e5%b9%b4）

 e.g.    iciba  Leap year recurs every four years.每四年闰年一次. re answer: dictionaries are hardly ever wrong
user6065
CC BY-SA 3.0
2017-12-03T01:37:57.783Z
https://zhidao.baidu.com/question/166886639.html 每隔两天，就是第三天
Mou某
CC BY-SA 3.0
2017-12-03T01:38:54.137Z
https://zhidao.baidu.com/question/10521962.html every three days
Mou某
CC BY-SA 3.0
2017-12-04T13:32:26.413Z
@user6065 Thank you for your input. But I don't think it relates to the duration the event lasts, like the example I gave.
cnwang09
CC BY-SA 3.0
2017-12-04T18:39:49.157Z
It seems numeral 一 represents a special case,see examples in comment＃１，more examples from bkrs (translation often in Russian):每隔一小时服一汤匙药 every hour,每隔一日every day,每隔一小时 every hour, 每隔二小时 every 2nd hour, 每隔半月 every half a month, 这个医生每隔一天就去看那个病人一次。
The doctor went to see that patient day about.每隔一周
week about; every other week
他们每隔三天见一次。
They see each other once every three days.  **iciba**  每隔一个月every other month 缩写为 eom ； I have lunch with my publisher every other month.
我每隔一个月就和我的出版商一起吃顿午饭. **ichacha**  eod every other day    每隔一日... https://zhidao.baidu.com/question/422597497.html
user6065
CC BY-SA 3.0
2017-12-05T21:29:40.153Z
@user6065 I disagree. 他们每隔三天见一次 is not the same as 他们每三天见一次. 他们每隔三天见一次 means "they see each other once every four days". But 他们每三天见一次 means "they see each other once every three days".
cnwang09
CC BY-SA 3.0
2017-12-05T22:23:49.460Z
some users suggest: why not communicate disagreement to quoted dictionaries?
user6065
CC BY-SA 3.0
2017-12-13T07:45:22.430Z
see baidu: 美国科幻大片名字 英文名： The Fifth Element
这股绝对的邪恶 **每五千年降临一次** ，然而 **每隔五千年** ，人类都会忘记该怎么去对付它。once every 5000 years,
user6065
CC BY-SA 3.0
2017-12-23T14:34:27.327Z
@user6065 All your examples explain the reason that I brought this issue up. Those resources are not always correct.
cnwang09
<grammar><phrase-meaning>
What does 每隔 mean?
# What does 每隔 mean?

(Asked by: username_0 on 2017-12-02)

每隔一周 means "every two weeks" or "every other week" in English. So, it looks like “每隔 x” is equivalent to "every x+1" in English.

However, I noticed many online dictionaries have 每隔两天 equivalent to "every two days". But I thought 每隔两天 should be "every three days". Can anyone explain?

**Tags:** grammar, phrase-meaning

> **Comments:**
> **username_1**: 每隔X at an interval of X in between,  bkrs：每隔 固定间隔一段时间。at intervals of every (so often)他们每隔三天见一次。 They see each other once every three days.一路公共汽车每隔3分钟就有一班。 There’s a Number One bus every three minutes. 改 每隔四小时喝十滴。 Take ten drops every four hours.   墨西哥城大约每隔十年降一次雪。About once in ten years  snow ... ＂汉语水平考试词典＂隔［义２］时间或空间上有离距；间隔（at a distance from;after or at an interval of):～日｜～夜｜你～几天再去｜北京和天津相～一百多公里。 If a particular repetitive eve. lasts for about one  week, then "at intervals of 1 week" may mean every other week. If an event lasts about a day each time then, 每隔两天 may mean every 3 days.  
> **username_1**: it does not have to last for a whole time period (week,day) as long as such a period is reserved for it  
> **username_1**: To avoid any ambiguity may say 每＋数词 ＋ （个）＋ 时期 ＋ 一次，once every + numeral ＋（time period）s （whether or not use CL 个 depends on "时期", 天、年：no 个，月：个，see e。 g。https://chinese.stackexchange.com/questions/27695/whats-wrong-with-%e4%b8%80%e4%b8%aa%e5%b9%b4）   e.g.    iciba  Leap year recurs every four years.每四年闰年一次. re answer: dictionaries are hardly ever wrong  
> **username_2**: https://zhidao.baidu.com/question/166886639.html 每隔两天，就是第三天  
> **username_2**: https://zhidao.baidu.com/question/10521962.html every three days  
> **username_0**: @username_1 Thank you for your input. But I don't think it relates to the duration the event lasts, like the example I gave.  
> **username_1**: It seems numeral 一 represents a special case,see examples in comment＃１，more examples from bkrs (translation often in Russian):每隔一小时服一汤匙药 every hour,每隔一日every day,每隔一小时 every hour, 每隔二小时 every 2nd hour, 每隔半月 every half a month, 这个医生每隔一天就去看那个病人一次。 The doctor went to see that patient day about.每隔一周 week about; every other week 他们每隔三天见一次。 They see each other once every three days.  **iciba**  每隔一个月every other month 缩写为 eom ； I have lunch with my publisher every other month. 我每隔一个月就和我的出版商一起吃顿午饭. **ichacha**  eod every other day    每隔一日... https://zhidao.baidu.com/question/422597497.html  
> **username_0**: @username_1 I disagree. 他们每隔三天见一次 is not the same as 他们每三天见一次. 他们每隔三天见一次 means "they see each other once every four days". But 他们每三天见一次 means "they see each other once every three days".  
> **username_1**: some users suggest: why not communicate disagreement to quoted dictionaries?  
> **username_1**: see baidu: 美国科幻大片名字 英文名： The Fifth Element 这股绝对的邪恶 **每五千年降临一次** ，然而 **每隔五千年** ，人类都会忘记该怎么去对付它。once every 5000 years,  
> **username_0**: @username_1 All your examples explain the reason that I brought this issue up. Those resources are not always correct.  

---

## 3 answers

### Answer by username_3 on 2017-12-02. Score: 1 | Accepted answer

Tricky that. I think you are right and the dictionaries are wrong!

间隔： gap, interval

隔开: separate

每 间隔 一周   
every gap 1 week: Something happens week 1, not week 2, again week 3

每 间隔 两天   
every gap 2 days: Something happens day 1, not day 2, not day 3, again day 4

> **Comments:**
> **username_0**: I also feel "每隔" and "每" are not the same. "每隔两天" means "something happens day 1, not day 2, not day 3, again day 4". “每两天” means "something happens day 1, not day 2, again day 3".  
> **username_3**: Agree! Definitely not the same. 每两天一次， every second day 1 time, 每隔两天一次  every third day one time. (really 'after an interval of 2 days again 1 time) . Also the maximum duration of an event in this expression is limited to the time period used, here day. Otherwise we would need a more complicated expression. I often think Chinese is more penetratingly perspicacious than English. "每隔两天"  is a good example.  
> **username_4**: This is over-relying on the literal meaning, rather than how the words are actually used. In practice, as @username_5 says in their answer, it's a vague way of saying things.  

---

### Answer by username_5 on 2017-12-03. Score: 2

每隔 means "every". It can be used as "每隔" + quantity + unit.

For example:

- every + 2 + days = 每隔+两(2)+天

I drink a cup of coffee every two days. = 我每隔2天喝一杯咖啡。

This means you consume a cup of coffee every 48 hour interval.

- every 500 meters = 每隔 + 五百(500) + 米

I stop every 500 meters. = 我每隔500米停一次。

It means you stop at 500 meters, and stop again when you reach 1000 meters.

In conclusion, as my understanding, "每隔两天" means "every 2 days"(not 3).
However, your concern is legit. It is a vague way of saying things. Thus, if it is a more serious situation (e.g. contract), instead of a day to day conversation, you should clarify.

> **Comments:**
> **username_0**: Using your formula 每隔 + quantity + unit, this is what I have seen: if quantity=1, then 每隔 + quantity + unit=every x+1 unit; if quantity>1, then 每隔 + quantity + unit=every x unit. I feel I am learning math, not Chinese now. :)  
> **username_0**: If the unit is distance instead of time, then I think it depends on the length of the subject. For example, if the subject is a 100-meter high-speed train and it 每隔500米停一次, then the next time it should stop at 1100 meter, not 1000 meter.  

---

### Answer by username_6 on 2017-12-03. Score: 0

As @username_1 said in comment, 每隔X means 'with interval of X', which does not specify duration of the event.

每隔一周 does not necessarily mean 'every two weeks'. If the event takes place for a week every time, which is the common assumption when someone says 每隔一周, then it means that. But it is possible the the event takes only 1 hour, then it means every one week, although people tend to say it in a different way in the first place.

Similarly, 每隔两天 might be used commonly with an event that has one day duration, hence every three days. But again it could be different, e.g. “每隔两天一次，每次10分钟” then it is an inaccurate way of saying every two days. (It is inaccurate because strictly speaking the interval is 2 days less 10 minutes.)

> **Comments:**
> **username_7**: I disagree, 每隔一周 does mean "every other week", while 每一周 means "every week".  
> **username_0**: @NS.X Thank you for your input. But I don't think "每隔 X" implies the event lasts for the entire X period of time. For example, the sentence is 他喜欢那家茶馆，一般周三下午去，每隔一周去一次。  

---

