What Does BC Mean in a Text? Because and Other Uses

In a text or social post, BC (also written bc, b/c or B/C) means 'because', as in 'I wasn't at school bc I was sick'. Cambridge Dictionary lists that informal meaning alongside two others that cause mix-ups: 'before Christ' after a year, as in 31 BC, and British Columbia, the Canadian province, in addresses.

BC is one of those abbreviations that changes completely depending on where you meet it. In a group chat, it's the shortest way to explain yourself. In a history book, it's a way of counting years. On an envelope, it's a place. Below, I'll show you how to tell which BC you're looking at, plus a few less common meanings that turn up in the wild.

bc as 'because' in texts and comments

Cambridge Dictionary labels this BC an informal conjunction and a written abbreviation of 'because', used on social media and in text messages. Its examples give you the flavour: 'I did it BC I wanted to' and 'Come quick b/c there is food.'

You'll see it in lowercase most of the time. The slash version, b/c, is older and more common in notes and emails. Either way, it joins a reason to a statement, exactly like the full word.

These are made-up messages to show how it's used, not real chats:

'Can't come tonight bc work ran late.' Simple reason.
'Bought the bigger one bc why not.' A shrug of a reason.
'Leaving early b/c the trains are a mess.' Same job, older spelling.
'Love this bc it reminds me of my nan.' A sweet reason in a comment.

BC after a year: before Christ and the 1627 history book

In dates, BC means 'before Christ' and counts years back from the traditional year of Jesus's birth. Wiktionary says it's a translation of the Latin 'ante Christum', popularised by the 1627 publication of a book on chronology by French theologian Denis Pétau.

There's a placement rule that trips people up. Dictionary.com says BC always comes after the date or century, as in 'Cleopatra lived from 69 to 30 BC'. AD, its partner, traditionally goes before the year. Wiktionary notes some writers prefer BCE, 'before the Common Era', as a non-religious alternative. The numbers are the same, only the label changes.

BC on an envelope: British Columbia, Canada

Cambridge lists BC as the written abbreviation for the Canadian province of British Columbia, used in addresses, as in 'Vancouver, BC, Canada'. Dictionary.com confirms it's the approved postal abbreviation. If you see BC after a city name and before Canada, it's a place, not a reason and not a date.

Other BCs: birth control, Boston College and border collies

Wiktionary lists a long tail of other uses. A few you might meet in everyday life:

Where you see BC	What it means	Quick clue
Text, comment or caption	Because	It joins a reason to a statement
After a year	Before Christ	A number sits right before it
In an address	British Columbia	Followed by Canada or a postcode
Health or pharmacy chat	Birth control	Talk of pills, doctors or prescriptions
College sports	Boston College	Team names, scores, fixtures
Dog owners' groups	Border collie	Photos of black-and-white dogs
An old office letter	Blind copy	A note at the foot of the page

That last one has a neat history. Dictionary.com lists 'blind copy' as a notation on a copy of a letter sent to a third person without the main addressee knowing. It's the paper ancestor of the BCC line in your email.

BC versus BCE, and AD versus CE

If you've got children doing history homework, you'll probably see both systems. Wiktionary explains that BCE stands for 'before the Common Era' and is used by people who want to avoid the Christian framing of BC. Its partner, CE, 'Common Era', replaces AD, which is short for the Latin 'anno Domini', 'in the year of our Lord'.

Wiktionary also notes a style point: the Chicago Manual of Style and most house styles put AD before the year and BC after it, so it's AD 220 but 206 BC. In casual writing, people mix the order up, and nobody's going to mark you down for it in a text. The years themselves never change, only the label on them.

Wiktionary's own example shows the two side by side: the Han dynasty ruled China from 206 BC to AD 220. If you're working out how long ago something happened, remember the BC numbers count down towards that line while the AD numbers count up from it.

Work with me

Want AI doing the heavy lifting in your marketing?

I build the systems that handle the boring 80 percent, so you get your week back. Done properly, with the human kept in.

Book a free 30-minute call Or grab the free resources →

A reason often follows a clarifying question, so it's worth knowing what WDYM means.

Reading BC by capitals, slashes and dots

Spelling gives you strong hints. Lowercase 'bc' or 'b/c' in a casual message is almost always 'because'. 'BC' in capitals after a number is a date. 'B.C.' with dots is common in older or more formal writing for both the date and the province. Cambridge lists all of bc, B/C and b/c for the 'because' sense, so capitals alone don't settle it. Look at what's around it.

If you still can't tell, ask. 'Wait, BC as in because?' is a perfectly normal reply, and nobody minds. Pronunciation helps too: Cambridge gives it as 'bee-see' for the date and the province, but most people reading 'bc' in a text simply hear the word 'because' in their head.

The other connector people shorten in messages is BTW, so read how BTW is used and why it can sound pointed.

Using bc in work messages and on a business page

If you're messaging a friend or a colleague you're close to, bc is fine. In a work chat where people know each other, it's widely understood. I'd avoid it in anything formal: a proposal, an invoice email, a reply to a complaint or anything a client might forward. 'Because' takes four extra letters and removes all doubt.

On social, my advice for brands is to match how your audience writes. A casual caption like 'closed Monday bc we're painting' reads friendly. A policy notice or anything about refunds or safety should spell it out. If you're also wondering about opinion shorthand, my guide to what IMO means is a good companion, and so is my page on EOD deadlines if work chats are where you see these most.

Frequently asked questions