How to Type the Pi Symbol

Quick answer

The lowercase Greek letter pi is π. You can copy it directly here: π.

Use π when you need a plain-text character. Use \pi inside a LaTeX math expression. The Unicode code point is U+03C0, and the HTML named character reference is π.

Pi formats at a glance

The character π is a Greek letter. In mathematics it commonly represents the circle constant, but the same letter can be used for other quantities when a document defines it differently.

Type π on Windows

The most reliable Windows method depends on the application.

1. Copy and paste: copy π from this page and paste it into any Unicode-capable field.
2. Microsoft Word equation: insert an equation, type \pi, and press Space. Word converts the command inside the equation object.
3. Character Map: open Character Map, choose a font that includes Greek characters, find Greek small letter pi, and copy it.
4. Word Unicode conversion: in compatible Word text, type 03C0, then press Alt+X to convert the code to π. Pressing Alt+X again displays the code.

Do not expect a generic numeric Alt code to work consistently across applications. Traditional Alt-code behavior depends on the active code page and is not a universal Unicode input method.

Type π on Mac

Press Control+Command+Space to open Character Viewer. Search for pi, choose the Greek small letter π, and insert it.

For repeated use, you can also add a macOS text replacement, such as replacing a unique shortcut like ;pi with π. Choose a shortcut that will not appear naturally in normal writing.

In equation editors that accept LaTeX-style input, use \pi rather than inserting the character manually. The equation editor can then apply mathematical spacing and keep the expression editable.

Type π in Word, Google Docs, and presentations

Microsoft Word

For a standalone character in prose, paste π or use 03C0 followed by Alt+X. For an equation, insert a Word equation and enter \pi.

Example equation source:

A=\pi r^2

Google Docs

For normal text, paste π. For an equation, choose Insert → Equation, then insert the Greek letter from the equation toolbar or enter it through a supported equation workflow. Google Docs does not treat every LaTeX command exactly like a full LaTeX compiler, so verify the rendered result.

PowerPoint and Keynote

Use a native equation object when π appears inside a fraction, exponent, matrix, or multi-line expression. Use the Unicode character only when it is a simple label or part of ordinary text.

Use π in LaTeX

Enter \pi in math mode:

C=2\pi r

A=\pi r^2

Uppercase pi is a different character and command. \Pi produces Π, which is commonly used for product notation or as an uppercase Greek variable. Do not substitute Π for π in the circle formulas above.

Use π in HTML and MathML

For ordinary HTML text, all of these can represent the same character:

π
π
π
π

A literal UTF-8 character is usually easiest to read in modern source files. A named or numeric reference can be useful when source conventions require it.

Inside semantic MathML, pi is normally an identifier:

<math>
  <mi>π</mi>
  <msup><mi>r</mi><mn>2</mn></msup>
</math>

Use <mi> rather than <mo> because π is functioning as an identifier or constant, not as an operator.

Pi symbol versus similar characters

Do not replace π with any of these:

• Latin lowercase p;
• Greek uppercase Π;
• product operator ∏;
• an image of the symbol;
• a decorative font glyph whose underlying character is not U+03C0.

They may look related, but their encoded identity and mathematical meaning are different. Search, copying, screen readers, and equation conversion can all fail when a look-alike is used.

Troubleshooting

• A square or missing glyph appears: change to a font with Greek character coverage.
• \pi stays as text: make sure you are inside an equation or LaTeX math environment.
• The character changes after export: inspect the exported PDF or document and confirm that the font is embedded or substituted correctly.
• A system reads “p”: check that the source contains U+03C0, not the Latin letter.

Which method should you choose?

Use π for plain text and copy-paste tasks. Use \pi for editable LaTeX and compatible equation editors. Use MathML when the expression is published as semantic web mathematics. Always verify the final document or page, because input shortcuts and rendering behavior vary by application.

Choose the input method for this task

For how to type pi symbol, first decide whether the destination needs one searchable Unicode character or a structured equation. Copy the Unicode character for prose, labels, filenames, and search fields. Use the documented LaTeX command or a native equation object when scripts, fractions, limits, or scalable delimiters are part of the expression.

Verify the exact character

1. Paste the result into the real destination, not only a preview field.
2. Inspect the Unicode code point or equation source so a look-alike cannot pass unnoticed.
3. Reopen the exported document and test selection, search, and copy-and-paste behavior.
4. When the symbol has several field-specific meanings, define the intended meaning beside its first use.

Troubleshoot a failed input

If the shortcut remains literal text, confirm that the cursor is inside the correct equation mode. If a missing-glyph box appears, switch to a font with the required character. If export changes the character, compare the source before and after export and use the Unicode value or structured equation source as the reference.