一いっヶか月げつ

い

っ

か

げ

つ

Common word

Meanings

noun

one month

Standard counter for a duration of one month. Used with 間 (かん) to emphasize duration, e.g., 一ヶ月間.

一いっヶか月げつに一いち度ど、病びょう院いんに行いきます。
I go to the hospital once a month.
このプロジェクトは一いっヶか月げつで終おわらせます。
I will finish this project in one month.

See all 80 example sentences ›

Usage patterns

〈事こと〉に一ヶ月かかるにいっかげつかかるto take one month (to do something)
このプロジェクトが完かん成せいするまで一いっヶか月げつかかった。
It took one month for this project to be completed.
一ヶ月に一度いっかげつにいちどonce a month
彼かれは一いっヶか月げつに一いち度ど、実じっ家かに帰かえる。
He goes back to his parents' house once a month.
一ヶ月前いっかげつまえa month ago / a month before
一いっヶか月げつ前まえにこの町まちに引ひっ越こしました。
I moved to this town a month ago.
一ヶ月後いっかげつごa month later / in a month
一いっヶか月げつ後ごに検けん査さの結けっ果かが出でます。
The test results will come out in a month.
一ヶ月ぶりいっかげつぶりfor the first time in a month
一いっヶか月げつぶりに友とも達だちに会あった。
I met my friend for the first time in a month.

Grammar

一人ひとり・二に本ほん・三さん冊さつnumbers and countersN5

Kanji

一one, one radical (no.1)
月month, moon
箇counter for articles

Related words

一ひと月つきN5
一月 (ひとつき) is the everyday spoken word for 'one month', while 一ヶ月 is the standard written/formal counter form.

Don't confuse with

一いち月がつN5
一ヶ月 means 'one month' (a duration), while 一月 read いちがつ means 'January' (a specific calendar month) — easy to mix up without the ヶ.

Word family

丸まる一いっヶか月げつ
the whole month; an entire month
一いっヶか月げつ検けん診しん
1-month checkup (for a baby)

Written forms

一いっヶか月げつ
Most common kanji spelling; the small ヶ is a counter marker.
一ヵ月いっかげつ
Variant with small ヵ; less common but still seen.
一いっカか月げつ
Variant with full-size カ; often used in vertical writing or older texts.
一いっか月げつ
Hiragana か variant; common in informal writing.
一いっ箇か月げつ
Formal or legal spelling using 箇; rarely used in everyday writing.
一いっケか月げつ
Variant with large ケ; mostly seen in older documents.
１いっヶか月げつ
Arabic numeral variant; common in digital text and casual writing.
１ヵ月いっかげつ
Arabic numeral with small ヵ.
１いっカか月げつ
Arabic numeral with full-size カ.
１いっか月げつ
Arabic numeral with hiragana か.
１いっ箇か月げつ
Arabic numeral with formal 箇.
１いっケか月げつ
Arabic numeral with large ケ.

Etymology

Compound of 一 (いち, 'one') + ヶ (a counter marker derived from 箇) + 月 (げつ, 'month'). The reading いっかげつ results from a sound change where いち + か becomes いっか.