a rough approximation

USAGE SUMMARY

The phrase "a rough approximation" is correct and usable in written English.
It can be used when you want to indicate that a value or estimate is not exact but is close enough for practical purposes. Example: "The distance to the nearest town is a rough approximation of 10 miles, but it may vary depending on the route taken."

✓ Grammatically correct

Academia

Formal & Business

News & Media

Science

Encyclopedias

Wiki

Reference

Social Media

Human-verified examples from authoritative sources

Exact Expressions

60 human-written examples

Monday's presidential debate provided a rough approximation of this experiment.

The New York Times

At best, there could be only a rough approximation.

Cornell University

It is, however, only a starting point, a rough approximation.

Harvard University

On a theoretical level, it can be, at best, a rough approximation.

The New Yorker

But as a rough approximation, it does give you an idea what most places are experiencing.

The Washington Post

Segalman cautioned that what she's designing is really just a "rough approximation" of photosynthesis.

The New Yorker

A rough approximation for extracting RDF out of an arbitrary character stream.

Stanford University

To a rough approximation, gases diffuse about 100,000 times faster than do liquids.

Encyclopedia Britannica

To a rough approximation, liquids are about 100 times more viscous than gases.

Encyclopedia Britannica

The combination of blue and yellow produces a rough approximation of white light.

The Economist

The children who turned up bedraggled, a bit whiffy and wearing only a rough approximation of school uniform.

The Guardian - Opinion

Expert writing Tips

Best practice

Use "a rough approximation" when you want to convey that a figure or calculation is not precise but is close enough for practical purposes. It is suitable when exactness is not crucial.

Common error

Avoid using "a rough approximation" when a more precise measurement is available or necessary. Using it inappropriately can undermine credibility.

Linguistic Context

The phrase "a rough approximation" functions as a noun phrase, often serving as a subject complement or an object of a preposition. As Ludwig AI indicates, it is used to describe a figure or value that is not exact but close enough for the purpose.

Expression frequency: Very common

Frequent in

News & Media

30%

Science

25%

Academia

20%

Less common in

Encyclopedias

10%

Formal & Business

8%

Wiki

7%

Ludwig's WRAP-UP

The phrase "a rough approximation" is a common and acceptable way to indicate that a value or estimate is not exact but is close enough for practical purposes. As Ludwig AI confirms, it's grammatically correct and widely used across various contexts, from news articles and academic papers to everyday conversation. While alternatives like "an estimated value" or "a ballpark figure" exist, "a rough approximation" strikes a balance between formality and clarity. When using this phrase, it's important to avoid overstating precision and to be mindful of situations where exactness is crucial. The phrase's prevalence in authoritative sources like The New York Times and The Washington Post underscores its widespread acceptance and utility.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

an approximate calculation

Emphasizes the calculation aspect, suggesting that a calculation, rather than a general estimate, is being made, but it is not precise.

a crude estimate

Highlights the lack of refinement in the estimation, suggesting a basic or preliminary assessment.

a ballpark figure

Implies a broad, general estimate, often used in informal settings, suggesting the number is close but not exact.

a working estimate

Suggests an estimate that is being used for planning purposes, but may be subject to change as more information becomes available.

a tentative assessment

Emphasizes the uncertainty and provisional nature of the evaluation, indicating that it is subject to revision.

an educated guess

Highlights that the estimation is based on some knowledge or experience, but is still not a precise determination.

a preliminary indication

Focuses on the initial, early stage of the estimation, suggesting that it is only a starting point.

a broad generalization

Emphasizes the lack of specificity, suggesting a sweeping statement that may not apply in all cases.

a loose reckoning

Implies that the calculation is not strict and may be subject to some error.

a back-of-the-envelope calculation

Highlights the informal and quick nature of the estimation, suggesting it was done quickly without detailed analysis.

FAQs

How can I use "a rough approximation" in a sentence?

You can use "a rough approximation" to indicate that a calculation or estimate is not exact but is reasonably close. For example, "The cost of the project is "a rough approximation" of $1 million".

What are some alternatives to "a rough approximation"?

Alternatives include "an approximate calculation", "a crude estimate", or "a ballpark figure". The best choice depends on the specific context and the level of formality required.

Is it appropriate to use "a rough approximation" in formal writing?

While "a rough approximation" is acceptable in many contexts, it's often better to use more precise language in formal writing when possible. If exactness is not feasible, phrases like "an estimated value" or "a close estimate" might be more suitable.

When should I avoid using "a rough approximation"?

Avoid using "a rough approximation" in situations where accuracy is critical, such as in scientific research or legal documents. In these cases, it's essential to provide the most precise measurements and data available or explain in detail how the approximation was derived.