Fourth or forth is a common word-choice problem because the two words sound alike and look almost alike. Still, they do not mean the same thing.
Use fourth when you mean number four in order, rank, date, or amount. Use forth when you mean forward, outward, or onward, especially in phrases like back and forth, go forth, put forth, and from that day forth.
Quick Answer
Fourth means “number four in a series.” It can describe a position, date, rank, or one of four equal parts. Forth means “forward,” “outward,” or “onward.” These words are homophones, so they sound the same, but they are not interchangeable.
Why People Confuse Them
People confuse fourth and forth mainly because they have the same pronunciation. In everyday speech, you cannot hear the extra u in fourth.
The spelling also causes trouble. Fourth contains four, so it connects to the number 4. Forth does not contain four, so it does not name a number. It points to movement, direction, or progress.
A simple memory tip works well: fourth has four in it. If your sentence is about number order, choose fourth.
Key Differences At A Glance
| Context | Best Choice | Why |
|---|---|---|
| Number order | fourth | It means number four in a sequence. |
| Competition rank | fourth | It shows position after third. |
| Calendar date | fourth | It names the fourth day of a month. |
| One of four parts | fourth | It can mean one quarter. |
| Forward movement | forth | It means forward or onward. |
| Out into view | forth | It can mean out or outward. |
| Repeated movement | forth | The correct phrase is back and forth. |
| Formal phrase | forth | It appears in phrases like put forth and set forth. |
Meaning and Usage Difference
Fourth is about order, position, or amount. You can use it for a place in line, a school grade, a floor, a date, a quarter, or a ranking.
Examples:
• She finished fourth in the race.
• The office is on the fourth floor.
• My appointment is on the fourth of August.
• One fourth of the class chose art.
Forth is about movement or direction. It usually means forward, outward, or onward. In modern US English, it appears most often in set phrases.
Examples:
• The team moved forth with the plan.
• The speaker put forth a new idea.
• We went back and forth over the budget.
• From that day forth, she saved every receipt.
Pronunciation matters here because the words sound alike: fourth and forth are both commonly said like “forth.” The difference shows in spelling and meaning, not in sound.
Compact comparison:
• Fourth = number order, rank, date, or one of four parts.
• Forth = forward, outward, onward, or part of a fixed phrase.
Tone, Context, and Formality
Fourth is neutral. You can use it in casual, school, business, legal, sports, and academic writing. It does not sound old-fashioned.
Examples:
• This is our fourth meeting this month.
• The fourth paragraph needs a clearer topic sentence.
Forth often sounds more formal or literary when it stands alone. Phrases like back and forth are common and natural. Phrases like go forth or from that day forth sound more formal, dramatic, or traditional.
Examples:
• Natural: We emailed back and forth all morning.
• Formal: The report sets forth the company’s position.
• Literary: The travelers went forth at sunrise.
Which One Should You Use?
Choose fourth if you can replace the word with 4th.
Correct:
• She lives on the fourth floor.
• He made his fourth attempt.
• The invoice is due on the fourth.
Choose forth if the idea is closer to forward, outward, or onward.
Correct:
• The plant put forth new leaves.
• They moved back and forth across the room.
• From that day forth, the rule changed.
For most everyday writing, fourth is more common because numbers, dates, ranks, and positions appear often. Forth is correct only when the sentence needs direction, movement, or a fixed phrase.
When One Choice Sounds Wrong
Forth sounds wrong when the sentence clearly needs a number.
Wrong: She came in forth place.
Correct: She came in fourth place.
Wrong: The meeting is on the forth of July.
Correct: The meeting is on the fourth of July.
Wrong: We parked on the forth level.
Correct: We parked on the fourth level.
Fourth sounds wrong when the sentence needs movement or a fixed phrase.
Wrong: We went back and fourth for an hour.
Correct: We went back and forth for an hour.
Wrong: He put fourth a strong argument.
Correct: He put forth a strong argument.
Wrong: From that day fourth, she changed her routine.
Correct: From that day forth, she changed her routine.
Common Mistakes (and Quick Fixes)
Mistake 1: Writing back and fourth
Use back and forth when something moves, shifts, or changes between two sides.
Correct: The emails went back and forth all afternoon.
Mistake 2: Writing Forth of July
Use Fourth of July because it refers to July 4.
Correct: We watched fireworks on the Fourth of July.
Mistake 3: Writing forth floor
Use fourth floor because the floor is number 4 in order.
Correct: The dentist’s office is on the fourth floor.
Mistake 4: Writing put fourth
Use put forth when someone presents, offers, or produces an idea, effort, or plan.
Correct: The manager put forth a better schedule.
Mistake 5: Treating the words as style variants
Fourth and forth are not regional spelling choices. They are separate words with separate meanings.
Everyday Examples
• This is the fourth time I have called customer service.
• The team finished fourth in the district tournament.
• Please read the fourth sentence again.
• My birthday is on the fourth of May.
• One fourth of the pizza is still in the box.
• The kids ran back and forth between the yard and the kitchen.
• She put forth a practical idea during the meeting.
• From that point forth, the policy applied to every new account.
• The plant brought forth tiny green shoots.
• They argued back and forth before choosing a date.
Dictionary-Style Word Details
Verb
• fourth: Not used as a verb in standard US English.
• forth: Not commonly used as a verb in standard US English. In phrases like bring forth, put forth, and set forth, the verb is bring, put, or set. Forth works as an adverb.
Noun
• fourth: Used as a noun. It can mean the fourth item in a series, one of four equal parts, or a musical interval. Example: “I ate a fourth of the sandwich.”
• forth: As the lower-case everyday word, forth is not commonly used as a noun in standard US English.
Synonyms
• fourth: Closest plain alternatives include 4th, number four, fourth place, and one quarter, depending on context. These are not always interchangeable in every sentence.
• forth: Closest plain alternatives include forward, onward, and outward. A useful directional opposite is back, but only in movement contexts.
Example Sentences
• fourth: The fourth chapter explains the main rule.
• fourth: She was the fourth person to sign in.
• fourth: We saved one fourth of the budget for repairs.
• forth: The company put forth a new proposal.
• forth: The puppy ran back and forth across the hallway.
• forth: From that day forth, he arrived ten minutes early.
Word History
• fourth: The word is historically connected with four, which is why the spelling includes four. For current use, the main point is simple: it names number order or a fourth part.
• forth: The word has long been used for forward or outward direction. In modern writing, it often appears in fixed phrases rather than as a casual stand-alone word.
Phrases Containing
• fourth: fourth place, fourth floor, fourth grade, Fourth of July, one fourth, fourth quarter.
• forth: back and forth, go forth, put forth, set forth, bring forth, from that day forth, and so forth.
FAQs
Is it fourth or forth?
Use fourth when you mean number four in order, rank, date, or amount. Use forth when you mean forward, outward, or onward. For example, write fourth place but back and forth.
What is the difference between fourth and forth?
Fourth is connected to the number four. It can mean the fourth item, fourth position, fourth day, or one of four equal parts. Forth means forward or onward and is common in phrases like put forth, set forth, and back and forth.
Is it back and forth or back and fourth?
The correct phrase is back and forth. It describes movement, discussion, or change between two sides or directions. Back and fourth is incorrect because fourth refers to number order.
Is it Fourth of July or Forth of July?
The correct spelling is Fourth of July. The phrase refers to July 4, so it needs fourth, the word connected to number order.
Is forth a real word?
Yes, forth is a real word. It means forward, outward, or onward. However, it is most common today in phrases such as back and forth, go forth, put forth, and from that day forth.
Can fourth and forth be used interchangeably?
No. Fourth and forth sound the same, but they have different meanings. Use fourth for number order. Use forth for forward movement or fixed phrases.
Is fourth a noun or adjective?
Fourth can be an adjective, noun, or adverb.
Is forth a noun or verb?
Forth is usually an adverb in modern English. It is not commonly used as a noun or verb in standard US English. In phrases like put forth and set forth, the verb is put or set, while forth adds the idea of forward or outward direction.
Why do people confuse fourth and forth?
People confuse fourth and forth because they sound alike and have similar spellings. The easiest way to remember the difference is that fourth contains four, so it connects to the number 4.
What is a simple trick to remember fourth vs forth?
Use fourth if you can replace it with 4th. Use forth if the meaning is closer to forward. For example, 4th place becomes fourth place, but movement from side to side is back and forth.
Conclusion
Use fourth for the number idea: fourth place, fourth floor, fourth grade, the fourth of July, or one fourth of something.
Use forth for forward or outward movement, especially in phrases like back and forth, put forth, set forth, and from that day forth. The words sound the same, but their meanings are different. When the sentence points to number 4, fourth is the correct choice.
