How Do You Spell 18 In Words Perfectly Without Mistakes

Spelling of 18 in words

How do you spell 18 in words:
Convert 18 dollars in words (USD):
Eighteen Dollars
18 spelling in British Pound amount (GBP):
Eighteen Pounds
How to write 18 Canadian dollars in letters (CAD):
Eighteen Canadian Dollars

How to write numbers in words similar to 18

Other conversions of the number 18

How to Spell 18

The number 18 is spelled as “eighteen”. It combines the root word “eight” with “teen” to indicate that it is seven numbers after ten. The spelling is straightforward, without any changes to the root word “eight”.

Spelling Details and Variations

For the ordinal form of 18, add “th” to the end, resulting in “eighteenth”. The numerical form of the ordinal is “18th”.

When to Spell Out 18 and When to Use the Numeral

Generally, we spell out the number 18 when writing it in text, especially if it is under three digits. For exact amounts like $18, we spell it out, but if there is change, we use numerals like $18.50. If 18 starts a sentence, it should be spelled out, and for scientific or technical contexts, numerals are used with units of measurement (e.g., 18kg).

Practical Examples in Sentences

  • Eighteen students joined the chess club this year.
  • She celebrated her eighteenth birthday with great enthusiasm.
  • The recipe called for eighteen ounces of chocolate.
  • They traveled for eighteen days across six countries.
  • When you turn eighteen, you are considered an adult.

Special Considerations

In financial and statistical contexts, use numerals like “$18 million” instead of spelling out the whole number. In technical writings, pairing the numeral with the unit of measure is standard (e.g., 18m/s). However, in non-technical or less formal contexts, the number can be written out in full.


The number 18 is used frequently in everyday life, and knowing how to use it correctly in text is important. Whether it’s for formal writing, technical documentation, or educational purposes, understanding when to spell out eighteen and when to use the numeral is a fundamental skill.


Consider the following questions to further your understanding of the number 18:

  • Write the number 18 in words.
  • How would you express 18 in ordinal form?
  • What is the binary equivalent of the number 18?
  • Is 18 a perfect square? Why or why not?

Solutions to Exercises

  • The number 18 in words is “eighteen”.
  • In ordinal form, 18 is “eighteenth”.
  • The binary equivalent of the number 18 is 10010.
  • No, 18 is not a perfect square because there is no integer that, when multiplied by itself, equals 18.

Frequently Asked Questions

Q1: How do you spell 18 in words?

Eighteen is spelled E-I-G-H-T-E-E-N.

Q2: Is 18 considered an odd number?

No, 18 is an even number because it is divisible by 2.

Q3: What are the factors of 18?

The factors of 18 are 1, 2, 3, 6, 9, and 18.