How to Say "One Thousand" in Japanese

千

[sẽ̞ɴ]

In Japanese, one thousand is 千.

The phrase 千 refers to the number that is ten times one hundred.

How does it change in a sentence?

Unlike in English, you do not need to say a word for 'one' before 'thousand' when counting. sen alone means one thousand.

English speakers often mistakenly say ichisen by adding the counter for one. Instead, use the standard way of saying sen to mean one thousand.

In the Japanese currency system, the number sen is also the name for a fractional unit of the yen equal to one hundredth of a yen.
In many Japanese contexts, the number 'one thousand' is written with the character 千, but in certain formal settings or for certain counts, it is part of a system that counts in blocks of ten thousand rather than thousands.
In Japanese folklore, the senbazuru is a tradition of folding one thousand origami cranes to grant a wish or recover from illness.

千円で足りる？
Is one thousand yen enough?
This sentence is useful for asking if a specific amount of money is sufficient.
Tatoeba #8733219 by bunbuku, translation #73497 by CK
千円しか持ってません。
I have no more than one thousand yen.
This sentence is useful for expressing that you have no more than a certain amount of money.
Tatoeba #155443 by KK_kaku_, translation #259095 by CK
千に百を加えると千百になる。
If you add one hundred to one thousand, you get eleven hundred.
This sentence is useful for demonstrating a mathematical addition involving one thousand.
Tatoeba #141436 by small_snow, translation #273135 by CK
Watashi no kozukai wa sen en desu. (私の小遣いは千円です)
My allowance is one thousand yen.
5 more sentences on Tatoeba

Daigo and Himari are counting pieces of a puzzle.

大翔 Hiroto

このパズルは全部で千ピースあるよ。
Kono pazuru wa zenbu de sen pīsu aru yo.
This puzzle has one thousand pieces in total.
陽葵 Himari

千ピースもあるの？大変そうだね。
Sen pīsu mo aru no? Taihen sō da ne.
There are one thousand pieces? That looks tough.
大翔 Hiroto

一緒にやればすぐに終わると思うよ。
Issho ni yareba sugu ni owaru to omou yo.
I think we'll finish quickly if we do it together.
陽葵 Himari

じゃあ、手伝うね。
Jā, tetsudau ne.
Okay, I'll help you.

Sources

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