Which words have the same meaning as therefore?

Here are some words that have similar meanings to "therefore":

Formal:

* Consequently

* Hence

* Thus

* Accordingly

* So

* As a result

* For this reason

* In consequence

* On that account

* Wherefore (archaic)

Informal:

* So

* Then

* Because of this

* That's why

The specific synonym you choose will depend on the context and the desired level of formality.