- Numbers with four digits or longer should have a comma every three digits from the right, e.g. 1,000, 20,000.
Exception: Years (‘the year 2014’).
- For fractions, change to decimals. “four and a half years old” = ‘4.5 years old’, “travelled half a kilometre” = ‘travelled 0.5km’
✓ 9:00 or 9pm
✘ 9 o’clock, 9, ‘nine’, 9p.m., 9PM
Words or Numbers?
Numbers one to ten:
- Write as words (including when used adjectivally, e.g. a two-year-old baby)
- Except in measurements and currency, e.g. “It was 8m long, it cost $10”
Numbers 11 and over:
- Write as digits, e.g. 27 years
- Except in numbers over a million, e.g. 5 million, 2 billion, 9 trillion
When you’re dealing with a range, such as “eighty to ninety percent” or “four million to five million dollars”, retain the usual number formatting rules and use a symbol for each number, with the word ‘to’ in between:
- eighty to ninety percent = 80% to 90%
- four million to five million dollars = $4 million to $5 million
- from eight PM to nine pm = from 8pm to 9pm
Captioning mathematics? There’s a page for that.
More questions? See our Recorded Captioning Style Guide.