Used and loved by millions
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
increased twofold
Grammar usage guide and real-world examplesUSAGE SUMMARY
"increased twofold" is a correct and usable phrase in written English.
It is often used to describe when something has doubled in size or amount. For example, "Since the company implemented their new policies, their sales have increased twofold."
✓ Grammatically correct
Science
News & Media
Formal & Business
Alternative expressions(20)
doubled
multiplied by two
experienced a twofold increase
grown twofold
two the size
twice as large
twice the size
double the size
significantly larger
two times larger
approximately double
almost twice as much
increased by a factor of two
markedly higher
risen by twice
two times as long
double the length
twice as long
virtually doubled
nearly doubled
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
60 human-written examples
Sales of his pet doors -- the kind that fit into sliding glass doors -- have increased twofold since he went online.
News & Media
Giske and his colleagues found that infection with a resistant strain of Pseudomonas increased, twofold to fivefold, a patient's risk of dying, and increased about twofold the patient's hospital stay.
News & Media
At the maximum of attack CGRP increased twofold.
The CTC metabolite iso-chlortetracycline increased twofold in concentration.
Mortality is increased twofold in patients with AF.
Science
By 2050, the population living in major cities, especially in developing countries, will have increased twofold.
By 2050, the population living in cities, especially in developing countries, will have increased twofold.
The plasma FFA15 levels increased twofold to threefold in comparison with the FFA0 levels.
Science
By 2050, the population living in cities will have increased twofold.
Plasma extravasation rate increased twofold to 0.53±0.04 mL/kg*min-1 (n=4, p=0.003).
Furthermore, the free fatty acid pool increased twofold in amastigotes likely resulting from the hydrolysis of TAG and PL.
Expert writing Tips
Best practice
When describing changes, ensure the context clearly identifies what "increased twofold" refers to. This avoids ambiguity and ensures clear communication.
Common error
Avoid using "increased twofold" without a clear reference point. For example, instead of saying "Sales increased twofold", specify "Sales increased twofold compared to last year."
Source & Trust
82%
Authority and reliability
4.6/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "increased twofold" functions as a verb phrase indicating the degree of increase, specifically doubling. As Ludwig AI confirms, it is a standard way to describe something that has doubled in quantity or size. The examples show its use across various contexts.
Frequent in
Science
77%
News & Media
18%
Formal & Business
5%
Less common in
Wiki
1%
Encyclopedias
0%
Reference
0%
Ludwig's WRAP-UP
In summary, "increased twofold" is a grammatically correct and very common phrase used to describe a doubling in quantity or size. Ludwig AI confirms its validity and frequent usage across various domains. Primarily found in scientific and news contexts, it serves to precisely quantify growth or change. Alternatives include "doubled" and "increased by 100 percent". When using the phrase, ensure there is a clear baseline for comparison to avoid ambiguity.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
doubled
Simpler term, directly indicating multiplication by two; may lack the formal tone of "increased twofold".
increased by 100 percent
More explicit, emphasizing the percentage increase; less concise than "increased twofold".
multiplied by two
Focuses on the mathematical operation; suitable for technical contexts.
rose by a factor of two
Emphasizes the scaling factor; commonly used in scientific or technical writing.
experienced a twofold increase
Rephrases the original by making 'increase' a noun, changing the sentence structure.
saw a 100% growth
More business-oriented, replacing increase with growth to show business profit.
became twice as large
Highlights change in size, more descriptive than just number multiplication.
expanded to twice its size
Emphasizes expansion and size, implying physical growth or scale.
escalated by two times
Replaces increase with escalated implying urgent, dramatic rise and may alter the tone of the sentence.
upped by 100%
More informal and conversational compared to "increased twofold".
FAQs
How do you use "increased twofold" in a sentence?
You can use "increased twofold" to describe a quantity that has doubled. For instance, "The company's profits "increased twofold" after the new marketing campaign."
What can I say instead of "increased twofold"?
Alternatives include "doubled", "increased by 100 percent", or "multiplied by two", depending on the context.
Is it correct to say "increased by twofold"?
While understandable, "increased twofold" is the more standard and grammatically sound phrasing. "Increased by twofold" is less common and can sound awkward.
What's the difference between "increased twofold" and "increased significantly"?
"Increased twofold" specifies a precise doubling, while "increased significantly" implies a substantial increase without specifying the exact amount. The choice depends on whether you need to convey a specific, quantifiable change or a general trend.
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
82%
Authority and reliability
4.6/5
Expert rating
Real-world application tested