18
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- 1 18
This is the standard Thai numeral for the number eighteen (18).
18
It expresses the number eighteen and is used for quantities, ages, dates, times, and numbers or labels.
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ห้องอยู่ชั้นสิบแปด hɔ̂ŋ yùu chán sìp pɛ̀ɛt The room is on the eighteenth floor. ห้องอยู่ชั้นสิบแปด details
Learning notes
Explanation
สิบแปด is formed from สิบ “ten” and แปด “eight.” Its Thai-numeral form is ๑๘. When counting people or objects, Thai normally uses the order “noun + numeral + classifier.” For example, นักเรียนสิบแปดคน means “eighteen students,” and หนังสือสิบแปดเล่ม means “eighteen books.” It also appears in expressions such as สิบแปดปี “eighteen years old” and สิบแปดนาฬิกา “18:00.”
Usage
It is used whenever the number 18 is needed, including quantities, ages, calendar dates, 24-hour times, room numbers, and other labels. It is standard in both speech and writing.
Caution
When counting people or objects, สิบแปด is normally followed by the appropriate classifier. To express the ordinal “eighteenth,” use ที่สิบแปด.