Fourth or Forth: Difference, Correct Usage, Spelling Structure, and Memory Tips Explained

Fourth and forth sound almost the same, but they mean different things. Fourth is the number word for position four. Forth means forward, onward, or out into view. The easiest way to remember the difference is this: fourth has “four” inside it because it is about the number four.

Quick Answer

Use fourth when talking about number order.

• She finished in fourth place.
• July Fourth is a holiday in the United States.
• This is my fourth cup of coffee today.

Use forth when talking about movement forward, outward, or onward.

• They went forth into the forest.
• The rules were set forth clearly.
• The children ran back and forth.

The simple rule is: fourth means number four in order, while forth means forward.

Fourth or Forth: What Is the Difference?

The difference between fourth and forth is meaning. Fourth is an ordinal number. It tells where something appears in a sequence: first, second, third, fourth.

Forth is usually an adverb. It describes movement, direction, or expression. It often means forward, onward, outward, or into action.

Word	Meaning	Example
Fourth	Number four in order	He came in fourth.
Forth	Forward, onward, or outward	They moved forth bravely.

If the sentence is about counting, ranking, order, dates, or position, use fourth. If the sentence is about movement or direction, use forth.

What Does Fourth Mean?

Fourth means number four in a sequence. It comes after third and before fifth. You can use it for rankings, dates, floors, attempts, chapters, grades, and repeated events.

Examples:

• She lives on the fourth floor.
• This is the fourth chapter of the book.
• He was the fourth person in line.
• The team scored in the fourth quarter.
• Our fourth meeting went better than the first three.

In each example, fourth tells you where something belongs in order. It is connected directly to the number four.

What Does Forth Mean?

Forth means forward, onward, outward, or away from a starting point. It is less common in everyday speech than fourth, but it appears in several familiar phrases.

Examples:

• The explorers went forth at sunrise.
• She stepped forth to accept the award.
• The statement set forth the company’s position.
• The river flowed forth from the mountain.
• They moved back and forth across the room.

Forth often sounds slightly formal, literary, or old-fashioned when used by itself. However, it is very common in phrases like back and forth, set forth, and bring forth.

Spelling Structure: Why Fourth Has “Four”

The spelling of fourth is easy to remember when you look at its structure:

• four + th = fourth

The word fourth keeps the full number four. Then it adds th, which is a common ending for ordinal numbers.

• six → sixth
• seven → seventh
• eight → eighth
• four → fourth

The most important spelling clue is the u. If the word is about the number four, keep the u:

• Correct: fourth
• Wrong for number order: forth

Think of the u as part of the number. Without the u, the word is no longer about number four.

Spelling Structure: Why Forth Has No U

Forth does not contain four because it is not a number word. It is about direction or movement. The spelling is shorter:

• forth = forward or onward

A helpful memory clue is that forth starts like for and points toward what comes next. When you go forth, you go forward. Both words begin with for:

• forth
• forward

This gives you a simple spelling connection: forth means forward, and neither word needs the “u” from four.

When to Use Fourth

Use fourth whenever you mean the fourth item, fourth person, fourth time, fourth place, or fourth part of something.

• The fourth answer is correct.
• She won fourth prize.
• The baby’s fourth tooth appeared this week.
• He missed the fourth question on the test.
• The fourth season was the most popular.

You also use fourth for dates and holidays.

• Her birthday is on the fourth of May.
• They watched fireworks on the Fourth of July.
• The rent is due by the fourth.

If you can replace the word with number four in order, then fourth is correct.

When to Use Forth

Use forth when the meaning is forward, onward, outward, or into action.

• The hero went forth to face the danger.
• The speaker came forth with new evidence.
• The law set forth clear requirements.
• The garden brought forth flowers in spring.

Forth appears in several common expressions:

• back and forth: moving one way and then the other
• set forth: explain, state, or present
• bring forth: produce or reveal
• come forth: appear or step forward
• go forth: move forward or begin a journey

In these phrases, forth is never spelled fourth.

Common Mistakes

A common mistake is using forth when the sentence needs the number word.

Incorrect:

• She finished in forth place.
• This is my forth attempt.

Correct:

• She finished in fourth place.
• This is my fourth attempt.

Another mistake is using fourth in the phrase back and forth.

Incorrect:

• They walked back and fourth.

Correct:

• They walked back and forth.

Remember: fourth counts. Forth moves.

Fourth vs Forth in One Sentence

You can use both words correctly in the same sentence:

• On the fourth day, they went forth into the mountains.

In this sentence, fourth tells which day it was. Forth tells the direction of movement. The words sound similar, but their jobs are different.

How to Remember the Difference

Use these memory tips:

• Fourth has four inside it because it means number four in order.
• Forth has no u because it is not about the number four.
• Forth means forward, and both words start with for.
• If you are counting, use fourth. If something is moving, use forth.

A simple memory sentence is: Fourth has four; forth goes forward.

This is the fastest way to choose the right spelling. Look for the number. If the meaning connects to four, write fourth. If the meaning connects to movement or direction, write forth.

Final Answer

Fourth means number four in order. Example: She finished in fourth place.

Forth means forward, onward, or outward. Example: They moved back and forth.

To remember the difference, look for four. If the word is about the number four, use fourth. If it is about moving forward, use forth.