Which to use
“thirty” is a num and “thrifty” is an adjective - they look or sound alike but fill different roles in a sentence.
- #3,791
- “thirty” frequency rank
- #34,718
- “thrifty” frequency rank
- 38509
- confusion score
Side-by-Side Comparison
| Feature | thirty | thrifty |
|---|---|---|
| Definition | The cardinal number occurring after twenty-nine and before thirty-one, represented in Arabic numerals as 30. | Showing thrift; economical; frugal. |
Where the spellings diverge
Shared letters are muted; the letters that actually set thirty and thrifty apart are highlighted. They share 5 letters in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
These two trip readers on the page rather than in the ear: thirty is /ˈθɜːti/ while thrifty is /ˈθɹɪfti/. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (num vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 38509, derived from the frequency rank of both members and their visual similarity.
thirty is recorded at frequency rank #3,791, classified as anum, pronounced /ˈθɜːti/. thrifty is at rank #34,718, tagged as anadj, pronounced /ˈθɹɪfti/.
Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.
With a confusion score of 38509, this pair ranks #285,307 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of thirty vs thrifty
Shared letters: hirty. Private to "thirty": -. Private to "thrifty": f.
"thirty" · 6 letters · shape CCVCCV · "thrifty" · 7 letters · shape CCCVCCV
Known mistypes of this pair
Frequency comparison
Frequently Asked Questions
Can "thirty" and "thrifty" be used interchangeably?
Which is more common, "thirty" or "thrifty"?
Remembering thirty vs thrifty
The fastest way to pick the right one every time.
- Check the role first: if you need a num, it's “thirty”; for an adjective, it's “thrifty”.
- See each word in full, definition, IPA, etymology and its other confusables. Full “thirty” entry
- Browse more pairs most likely to be confused. Most confusable