Workout vs. Work Out
“Workout” is a one-word noun for a period of physical exercise and can also have specialized financial meanings. “Work out” is the two-word phrasal verb for exercising, calculating, understanding, solving, or developing in a particular way.
Use “workout” for the noun and “work out” for the verb.
Key details
Choose the right form
| Context | Use | Decision |
|---|---|---|
| noun: a period/session of exercise | workout | Use the one-word noun. |
| verb: exercise | work out | Use the two-word phrasal verb. |
| verb: calculate, solve, understand, or develop | work out | Use the two-word phrasal verb for the action. |
Quick tests
Decision test
Is the expression naming a thing/session rather than functioning as a verb?
If yes: Noun → “workout.”
If no: Verb → “work out.”
Caveat: The one-word form is a noun; the two-word form is the phrasal verb. Specialized noun senses do not change that word-class boundary.
Examples
That was a demanding workout.
“Workout” is the noun naming an exercise session.
I work out before breakfast.
“Work out” is the phrasal verb meaning exercise.
We worked out the total before submitting the form.
The two-word verb also covers calculation/solution senses.
Further guidance
Core difference
You can “work out” at the gym and then finish “a workout.”
Fast Test
If tense works—“worked out,” “working out”—use the two-word verb.
Variant Boundary
The distinction is grammatical role rather than a regional spelling preference: noun versus phrasal verb.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
- WORKOUT — English meaning (opens in a new tab)Cambridge Dictionary · One-word noun “workout”
- WORK SOMETHING OUT / WORK OUT — English meaning (opens in a new tab)Cambridge Dictionary · Two-word phrasal verb “work out,” including exercise and other meanings