Capital vs. Capitol: Which is Correct?

If you are looking for the correct spelling, here it is: Capital is the correct spelling for almost everything, including cities, money, and uppercase letters.

The word "capitol" is a real word, but it has a highly specific meaning: it refers only to the physical building where a legislature meets. Using "capitol" for a city, money, or a letter is universally considered a grammatical error in professional, academic, and casual writing. If you struggle with this word pair, you are not alone—they are perfect homophones and represent one of the most frequently confused word pairs in the American English language.

Notice how the "o" in "capitol" visually resembles the round dome of the U.S. Capitol building, while the "a" in "capital" can stand for 'abundance' (money) or 'area' (city).

To understand why both spellings exist, we have to look at Latin. Both words derive from the Latin word "caput," which translates to "head." The word "capital" evolved to mean "chief" or "principal," applying to the chief city of a region or a principal sum of money.

The word "capitol," however, has a more specific historical origin. It traces back to the "Capitoline Hill" in ancient Rome, which was the central citadel and home to the Temple of Jupiter. When the United States built its legislative building, it was named the "Capitol" as a direct architectural and historical homage to that Roman temple.

Noah Webster, the father of American English spelling, intentionally simplified many words (like dropping the "u" in "colour"), but he left "capital" and "capitol" alone because their distinct spellings were necessary to differentiate the broader concept of 'head/principal' from the specific physical building in Washington, D.C.

• Capital city
• Capital letter
• Capital investment
• Capital punishment
• State capitol
• The US Capitol

In daily conversation, "capital" is often used to talk about cities or uppercase letters. For example, telling a friend, "I forgot to use a capital letter," or asking, "What is the capital of France?" It is a simple, ubiquitous word in basic geography and grammar.

• Sacramento is the capital of California.
• Always start a sentence with a capital letter.
• We took a train to the nation's capital.
• Please write your name in capital letters.
• The capital of Japan is Tokyo.

In academic writing, "capital" is frequently used in economics and political science. For instance, "The nation's financial capital was depleted during the war." It can refer to monetary assets, social capital, or the administrative center of a state.

• The startup needs to raise venture capital.
• Human capital is our most valuable resource.
• The capital markets are volatile right now.
• The capital of the pillar was cracked.
• The defendant faced capital charges for treason.

In business emails, "capital" is a standard term for money and resources. Saying "We need to raise capital for this project" is a precise professional way to discuss funding. Using the wrong spelling (capitol) when discussing finances is a major red flag in corporate communication.

• We don't have enough capital to expand the factory.
• He invested his capital in a new tech company.
• The company declared a capital gain on its taxes.
• The bank offered a loan to increase our working capital.
• She manages the firm's capital investments.