Quick Fix: Use “30 minutes” when you want to be crystal clear. Or go with “a half-hour”—just hyphenate it when it’s describing something, like “a half-hour meeting.”
What's Happening
You're trying to put 30 minutes into words, and you're wondering which version actually works. English gives you options: “half an hour” and “a half-hour” both mean the same thing. The catch? It depends on whether you're using the phrase as a noun or tossing it in front of another word as a modifier. By 2026, style guides like Merriam-Webster and Oxford Learner’s Dictionaries still accept both, but they insist on that hyphen when the phrase teams up with another noun.
Step-by-Step Solution
- Standalone noun: Skip the hyphen and go with “half an hour.”
Example: “The meeting lasts half an hour.” - Modifier before a noun: Hyphenate it—“a half-hour presentation.”
Example: “We scheduled a half-hour presentation.” - Numbers in schedules: Stick with “30 minutes” for spreadsheets, timers, or any place where numbers matter.
Example: “Duration: 30 minutes.” - Decimal time: In spreadsheets, 0.5 hrs equals 30 minutes.
Example: “0.5 hrs” in your favorite spreadsheet.
If This Didn't Work
- Regional twist: Down under? Skip the “a” and say “in half an hour.”
- Emphasize with “an hour and a half”: It’s great for speech or when you want to hammer the point home.
Example: “The flight took an hour and a half.” - Check your software: Exporting to Excel or Google Sheets? Make sure the cell is set to “Time” or “Duration,” or that 0.5 won’t get misread.
Prevention Tips
Want to dodge headaches in professional or technical writing? Here’s how:
- Pick a style guide—AP Stylebook is a solid choice—and stick with it.
- In schedules, always write “30 minutes.” It keeps automated systems from second-guessing you.
- Writing for a global crowd? Throw in both versions once at the start for clarity.
According to the Merriam-Webster dictionary, “half-hour” is a legit compound noun for 30 minutes. The Oxford Learner’s Dictionary agrees: hyphenate when it’s modifying another noun, like “a half-hour delay.” And GrammarBook backs this up for compound adjectives.
