Does the full stop go inside or outside the closing bracket? This is a common question. Here is the quick answer:
If brackets contain a complete sentence, then the full stop for that sentence is placed inside the closing bracket.
Here is an example:
Lee loves cheese-and-onion pies and eats at least two a day. (On weekends, he routinely eats four.) However, he burns hundreds of calories cycling to work.
If the brackets offer additional information that is not a complete sentence, then the main sentence keeps its own full stop.
Lee loves cheese-and-onion pies and eats at least two a day (four at weekends). However, he burns hundreds of calories cycling to work.
Lee loves cheese-and-onion pies and eats at least two a day (four at weekends.) However, he burns hundreds of calories cycling to work.
End Punctuation with Brackets Follows Logic
The use of end punctuation with brackets follows logic. If the end punctuation belongs to the text inside the brackets, keep it inside. If it belongs to the text outside the brackets, leave it outside.
A SENTENCE IN BRACKETS WITHIN A SENTENCE
Confusion arises when there is a complete sentence within a sentence (as opposed to afterwards). For example:
Great white sharks generally hunt by detecting the electrical fields (They can detect less than one billionth of a volt) emitted by the movements of their prey.
As the wine-growing season in France (we lived in France during my twenties) draws to a close, the festivals start.
(Note the lowercase w on we. You have a choice between uppercase and lowercase.)
If the text inside the brackets is a complete sentence within another sentence, you can omit the full stop for style reasons or, if you can't bide the idea of writing a complete sentence without a full stop, you can leave it in. (This is not recommended as it disturbs the flow of text.) There is a lot of leniency on this. You can even start the sentence inside the brackets with a lowercase letter if you think it helps your flow of text.
There's one more quirk. If the text inside your brackets (regardless of whether it's a full sentence or not) warrants a question mark or an exclamation mark, you must include them with the text inside the bracket. For example:
I ate a whole pack of chocolate biscuits (is that 24?).
(Note the full stop to end the main sentence.)
I ate a whole pack (yes, a whole pack!) of chocolate biscuits.