Use capital for a main city, money, an uppercase letter, or “most important” (the capital of France; capital letters). Use capitol only for the specific government building where a legislature meets (the U.S. Capitol).
The Core Difference
“Capital” covers almost all everyday uses: the seat of government of a country or region (Paris is the capital of France), financial assets (capital investment), uppercase letters (capital A), and the adjective meaning most important or serious (a capital offence).
“Capitol” (with an O) is a much narrower, specifically American term for the actual building where a legislature meets — most famously the U.S. Capitol in Washington, D.C., or a U.S. state capitol building.
- city / money / uppercase / important → capital: capital city, capital letter
- specific government building → capitol: the U.S. Capitol, the state capitol
Capital and Capitol in Context
Kyiv is the capital of Ukraine.
Remember to start the sentence with a capital letter.
The company raised new capital to expand.
Protesters gathered outside the state Capitol building.
Journalists reported live from the U.S. Capitol in the nation's capital, Washington, D.C.
Common Mistakes
| Incorrect | Correct | Why |
|---|---|---|
| ✗ the capitol of France is Paris | ✓ the capital of France is Paris | main city |
| ✗ write it with a capitol letter | ✓ write it with a capital letter | uppercase letter |
| ✗ the building is called the Capital | ✓ the building is called the Capitol | specific government building |
| ✗ raising capitol for the business | ✓ raising capital for the business | money/assets |
| ✗ visit the nation's capitol city | ✓ visit the nation's capital city | main city |
CapitOl has an O, like dOme — the U.S. Capitol famously has a large dome. Every other meaning uses CapitAl, the far more common spelling.
Related Questions
- Capital vs Capitol — full confusing-words comparison page with additional examples and exercises.
- All Confusing Words — browse all 300+ word-pair guides.
- All Questions — more quick-answer pages.
- Grammar Quiz — test your knowledge of confusing word pairs.
Frequently Asked Questions
What is the simplest rule for capital vs capitol?
Use “capital” for almost everything — cities, money, letters, seriousness. Use “capitol” only for the specific legislative building, especially in the U.S.
Is capitol used outside the United States?
Rarely — “capitol” is almost exclusively used for U.S. federal and state government buildings; most other countries' parliament buildings are simply described using “capital” or their proper name.
Why does capitol have an O?
“Capitol” comes from the Capitoline Hill in ancient Rome, home to a temple, and was later adopted as the name for the U.S. government building, keeping its distinct spelling.
Is capital always about geography?
No — “capital” also means financial assets (capital investment), an uppercase letter (capital letter), and an adjective meaning serious or primary (a matter of capital importance).
What does capital punishment mean?
“Capital punishment” refers to the death penalty, using “capital” in its sense of “involving the most serious consequence”.
Is Capitol Hill a place or a building?
“Capitol Hill” refers to both the hill in Washington, D.C. and, informally, the U.S. Congress itself, since the Capitol building sits on that hill.
Do state capitals and state capitols mean the same thing?
No — a state's “capital” is its main city (e.g., Sacramento is California's capital), while a state's “capitol” is the specific building where its legislature meets.
Why is this word pair mainly an American English issue?
Because “capitol” as a building name is a distinctly American usage tied to U.S. government architecture, this confusion is far less relevant in British or other English varieties.
What does capital gains mean?
“Capital gains” refers to the profit made from selling an asset, such as stock or property, for more than its purchase price, using “capital” in its financial sense.
Is Capitol always capitalized with an uppercase C?
Yes, when referring to the specific U.S. government building, “Capitol” is capitalized as a proper noun, just like “Congress” or “White House”.