Hence vs Thus

When to use each in English, with meaning, register, and examples.

Hence

Formal Top 3,000 (common) B2 adverb

Thus

Formal Top 2,000 (common) B2 adverb

Most common: Thus

	Hence	Thus
Pronunciation	🇬🇧 /["/hens/"]/ 🇺🇸 /["/hens/"]/ Hear Hence	🇬🇧 /["/ðʌs/"]/ 🇺🇸 /["/ðʌs/"]/ Hear Thus
Meaning	for that reason	for this reason; therefore
Example	We suspect they are trying to hide something, hence the need for an independent inquiry.	Many scholars have argued thus.
Register	Formal	Formal
How common	Top 3,000 (common)	Top 2,000 (common)
CEFR level	B2	B2
Part of speech	adverb	adverb
Collocations	hence the need, henceforth, hence it follows	thus it follows, thus far, thus far into, thus we conclude
Antonyms	therefore, thus	therefore, consequently
Common mistakes	Using 'hence' incorrectly as a standalone sentence., Confusing 'hence' with 'therefore' when they have slightly different usages., Forgetting to use a comma before 'hence' when it starts a new clause.	Using 'thus' in casual conversations where 'so' is more appropriate., Confusing 'thus' with 'that' in terms of meaning., Using 'thus' incorrectly as a conjunction instead of an adverb.
Usage notes	Used in writing or formal speech to explain outcomes or reasons. It may feel too formal in casual conversations.	Used primarily in writing or formal speech. It can sound too stiff or old-fashioned in casual conversation. Avoid using it in everyday chat.

Frequently asked questions: Hence vs Thus

What's the difference between Hence and Thus?

Hence: for that reason Thus: for this reason; therefore

Which is more common: Hence and Thus?

Thus is the most common in everyday English.

Are Hence and Thus the same CEFR level?

Hence: B2, Thus: B2 on the CEFR scale.

Can I use Hence and Thus interchangeably?

Not always. Hence and Thus are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.