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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
without looking it up
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "without looking it up" is correct and usable in written English. You can use it when referring to recalling information from memory rather than consulting a source. Example: "I can name the capital of France without looking it up." Alternative expressions include "off the top of my head" and "from memory."
✓ Grammatically correct
News & Media
Wiki
Academia
Alternative expressions(5)
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
16 human-written examples
Did Deefus spell "disingenuous" without looking it up?
News & Media
Meanwhile, I think I can spell Saltalamacchia without looking it up finally.
News & Media
PUHL: I cannot answer the second part of your question without looking it up since I am not a legally trained man.
Academia
I couldn't really tell you how much I earn without looking it up - I think that it's gone up by 3.5% or something in the past year, but I don't really take any notice of pay rises.
News & Media
The Öküzgözü that's just arrived at the Wine Society (£8.50; 13.5% abv), for example, is a grape that's native to eastern Anatolia (10 out of 10 if you knew that without looking it up in Jancis Robinson's Wine Grapes) and tastes like wild blackberries.
News & Media
Or, rather, last week I walked past a Ferrari 458 Spider (no, I didn't know that without looking it up) which had been covered in four grand's worth of brassy vinyl, this causing it to very much resemble the dodgy faux-gold taps I inherited when I bought my last flat.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
44 human-written examples
You can't memorize something you didn't know in the first place.Without looking it up, there is a "hole" in your story.
Wiki
In your own Church, women have already demonstrated your splendid giftedness; I know without looking it all up on Google that women are the Deans of at least three Cathedrals: Salisbury,York and Norwich.
News & Media
He had spent 16 seasons as an assistant at the university, a curio in central Pennsylvania — Brooklyn-born, degree from Brown University, a man who neither hunted nor fished, but who instead read the classics and routinely quoted poetry (without having to look it up).
News & Media
Imagine being a doctor who can immediately see the medical history for an unconscious ER patient without having to manually look it up on a computer and waste precious life-saving seconds.
News & Media
"And besides, do you realize how much work it would be for us to go over the files for the last twenty years?" The lady said she had hoped somebody would know, without having to look it up.
News & Media
Expert writing Tips
Best practice
Place this phrase near the fact or figure it modifies to ensure the reader understands which information was recalled from memory.
Common error
A common mistake is placing the pronoun "it" after the particle, as in "without looking up it". Because "look up" is a transitive phrasal verb, a pronoun object must always be placed between the verb and the particle.
Source & Trust
92%
Authority and reliability
4.9/5
Expert rating
Real-world application tested
Linguistic Context
The phrase ""without looking it up"" functions as an adverbial modifier consisting of a preposition ("without") followed by a gerund phrase. It specifies the manner in which a cognitive task is performed. According to Ludwig, this construction is idiomatic and grammatically standard for describing spontaneous recall.
Frequent in
News & Media
75%
Wiki
15%
Academia
5%
Less common in
Science
3%
Formal & Business
1%
Social Media
1%
Ludwig's WRAP-UP
In conclusion, ""without looking it up"" is a versatile and correct English expression used to denote information retrieved from memory. Analysis from Ludwig AI indicates that it is a common feature in high-quality journalism, serving to highlight an author's familiarity with a topic or to comment on the nature of information retrieval. Its primary grammatical hurdle is the correct placement of the pronoun within the phrasal verb "look up", which must be sandwiched to remain correct. Whether used in an op-ed in The New Yorker or a helpful guide on WikiHow, it remains an effective tool for grounding your claims in personal experience and cognitive reliability.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
from memory
Focuses more on the cognitive act of remembering rather than the action of not checking a source.
off the top of my head
A more idiomatic and slightly more informal way to say you are recalling something instantly.
without checking
More direct and simpler, emphasizing the lack of verification.
purely from recall
More formal and technical, often used in academic or psychological contexts.
without referencing a source
Explicitly mentions the lack of external documentation or citations.
by heart
Usually implies a deep, rote memorization of a specific text or sequence.
offhand
An adjective/adverb that suggests a lack of preparation or formal research.
without consulting a dictionary
Narrower in scope, specifically referring to the lack of word-based reference.
unassisted
Emphasizes the self-reliant nature of the action.
extemporaneously
A very formal alternative suggesting the information was produced without preparation.
FAQs
What can I say instead of "without looking it up"?
Depending on the context, you can use phrases like "from memory", "off the top of my head" or "without checking".
Is "without looking it up" formal enough for an essay?
While it appears in prestigious news sources, it is slightly conversational. In formal academic writing, you might prefer "without referencing external sources" or "from memory".
Which is correct: "looking it up" or "looking up it"?
The only correct form when using a pronoun is "looking it up". If you were using a noun, both "looking up the word" and "looking the word up" would be acceptable.
How to use "without looking it up" in a sentence?
You can use it at the end of a clause, such as: "I could tell you his phone number "without looking it up"."
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
92%
Authority and reliability
4.9/5
Expert rating
Real-world application tested