that's fast

USAGE SUMMARY

The sentence "That's fast" is correct and can be used in written English.
It is an idiomatic expression used to express admiration or surprise about the speed with which something was done. For example, "I can't believe you solved that problem so fast! That's fast!".

✓ Grammatically correct

News & Media

Human-verified examples from authoritative sources

Exact Expressions

52 human-written examples

Such an experience is about as far a break as one can get from what's typically thought of as the American meal: something that's fast, cheap and fits in one hand.

Forbes

"We're food that's fast".

The New York Times

She's like playing a post player that's fast".

The New York Times - Sports

But this is a well-built, effective phone that's fast and affordable.

Independent

"But I say that and people are like, 'Whoa, that's fast.' And it is.

The New York Times - Magazine

In my head it's all become this one thing that's fast draining of meaning.

The Guardian - Music

Human-verified similar examples from authoritative sources

Similar Expressions

7 human-written examples

"Jesus Christ that was fast," Marlon said.

The New Yorker

Wow, that was fast.

TechCrunch

Update: Well that was fast.

TechCrunch

Well, damn, that was fast.

TechCrunch

Fuck that was fast.

Vice

Expert writing Tips

Best practice

Use "that's fast" to express genuine surprise or admiration. Overusing it can diminish its impact.

Common error

Avoid using "that's fast" in formal or professional settings where a more nuanced or descriptive response is appropriate. For example, in a business report, quantify the speed instead of using the idiom.

Linguistic Context

The phrase "that's fast" primarily functions as an exclamatory remark expressing surprise, admiration, or acknowledgment of speed. As Ludwig AI clarifies, it's an idiomatic expression. Examples from Ludwig demonstrate its use in diverse scenarios, from commenting on the speed of completing a task to the rapid growth of a business.

Expression frequency: Common

Frequent in

News & Media

100%

Less common in

Formal & Business

0%

Science

0%

Encyclopedias

0%

Ludwig's WRAP-UP

In summary, "that's fast" is a common idiomatic phrase used to express surprise or acknowledgement of speed, as validated by Ludwig AI. Predominantly found in news and media contexts, it functions as an exclamatory remark, often carrying a positive connotation. While grammatically correct, its informal nature suggests it's best suited for casual conversations rather than formal writing. For more formal settings, consider alternatives like "that's quick" or "that was speedy". Remember to use the phrase judiciously to maintain its impact and avoid contextual inappropriateness.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

that's quick

Uses a different adjective to describe the speed, implying similar meaning.

that was speedy

Replaces "fast" with another adjective emphasizing speediness.

that's rapid

Employs a more formal adjective to denote high speed or swiftness.

that's swift

Similar to "rapid", conveys a sense of quick and efficient movement or action.

that's prompt

Indicates that something was done without delay; highlights efficiency.

that's accelerated

Suggests an increase in speed, emphasizing the rate of change.

that's high speed

More descriptive, emphasizing the high level of velocity.

that's promptly

Emphasizes the immediacy with which something was done.

that's rapidly

Emphasizes the high rate at which something is happening or progressing.

that's swiftly

Conveys a sense of quickness and ease in execution.

FAQs

How can I use "that's fast" in a sentence?

You can use "that's fast" to express surprise or acknowledgment when something happens quickly. For instance, "You finished the project already? That's fast!"

What can I say instead of "that's fast"?

You can use alternatives like "that's quick", "that was speedy", or "that's rapid" depending on the context.

Is it appropriate to use "that's fast" in formal writing?

While grammatically correct, "that's fast" is generally considered informal. In formal writing, opt for more precise and descriptive language to convey speed or efficiency.

When is it not appropriate to say "that's fast"?

Avoid using "that's fast" in situations where a more empathetic or sensitive response is needed. For example, if someone rushes through a difficult task and makes mistakes, it's better to offer constructive feedback rather than simply saying "that's fast".