Phi Symbol Φ φ — Copy, Paste and Type It

Q: How do I type the phi symbol on a keyboard?

On Windows, press Win + . → Symbols → Greek, or in Microsoft Word type 03C6 and press Alt + X; the classic Alt code Alt + 237 types φ and Alt + 232 types Φ. On a Mac, switch to the Greek keyboard and press F (Shift + F for the capital). Or simply copy it from the top of this page.

Q: What is the LaTeX command for phi?

Use \varphi for lowercase φ and \Phi for capital Φ, inside math mode: $\varphi$.

Q: What is the Unicode and HTML code for phi?

Lowercase φ is U+03C6, written in HTML as φ or φ. Capital Φ is U+03A6, written Φ or Φ.

The phi symbol is the 21st letter of the Greek alphabet, written φ in lowercase and Φ in uppercase. It is pronounced /faɪ/ (“FIE or FEE”). Click a symbol to copy it.

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Copy the phi symbol

Greek small letter phi U+03C6 · The lowercase letter

Greek capital letter Phi U+03A6 · The uppercase letter

Greek phi symbol (straight phi) U+03D5 · The ϕ form with a vertical stroke. This is what LaTeX’s \phi produces.

Empty set U+2205 · Set theory ∅ — not phi.

Diameter sign U+2300 · Engineering ⌀ for diameter — not phi.

Latin capital O with stroke U+00D8 · The Danish and Norwegian letter Ø — not phi.

Dashed boxes are look-alikes that are not the Greek letter — listed so you can tell them apart.

φ vs ϕ — and four symbols that are not phi

Lowercase phi has two forms, and they are separate characters:

φ (U+03C6) — the loopy, open form. This is the standard Greek letter and the one Alt + 237 types.
ϕ (U+03D5) — the straight form with a vertical stroke through a circle, common in mathematics.

LaTeX swaps them: \phi gives the straight ϕ and \varphi gives the loopy φ. If your PDF shows the wrong phi, switch the command.

Not phi: four slashed circles are often pasted in its place — ∅ (empty set, U+2205), ⌀ (diameter sign, U+2300), Ø (Danish/Norwegian letter, U+00D8) and the number 0 with a slash. Phi’s stroke runs vertically and extends above and below the circle; the others have a diagonal slash.

Not sure which Greek letter you need? See all 24 Greek symbols with codes.

Phi codes — Unicode, HTML, LaTeX and Alt codes

Char	Unicode	HTML entity	HTML decimal	HTML hex	CSS	JavaScript	LaTeX	Windows	Mac
φ	`U+03C6`	`φ`	`φ`	`φ`	`\03C6`	`\u03C6`	`\varphi`	`Alt + 237`	Greek keyboard `F`
Φ	`U+03A6`	`Φ`	`Φ`	`Φ`	`\03A6`	`\u03A6`	`\Phi`	`Alt + 232`	Greek keyboard `Shift + F`
ϕ	`U+03D5`	`ϕ`	`ϕ`	`ϕ`	`\03D5`	`\u03D5`	`\phi`	`03D5` then `Alt + X` (Word)	Character Viewer
∅	`U+2205`	`∅`	`∅`	`∅`	`\2205`	`\u2205`	`\emptyset`	`2205` then `Alt + X` (Word)	Character Viewer
⌀	`U+2300`	`—`	`⌀`	`⌀`	`\2300`	`\u2300`	`—`	`2300` then `Alt + X` (Word)	Character Viewer
Ø	`U+00D8`	`Ø`	`Ø`	`Ø`	`\00D8`	`\u00D8`	`—`	`00D8` then `Alt + X` (Word)	Character Viewer

Need the characters without any explanation? Open the Greek letters copy-paste sheet.

How to type the phi symbol

Windows

Fastest: press Win + . to open the emoji panel, choose the Symbols tab (Ω), then Greek.
Alt code: hold Alt and type 237 for φ or 232 for Φ on the numeric keypad with Num Lock on.
Microsoft Word: type 03C6 and press Alt + X for φ; 03A6 then Alt + X for Φ. Word converts it in place.

Mac

Add the Greek keyboard in System Settings → Keyboard → Input Sources, then F types φ and Shift + F types Φ.
Or open the Character Viewer with Ctrl + Cmd + Space and search “phi”.

iPhone and Android

iOS: Settings → General → Keyboard → Keyboards → Add New Keyboard → Greek. Tap the globe key to switch.
Android (Gboard): Settings → Languages → Add keyboard → Greek.
Or copy the character from the top of this page.

LaTeX

\varphi — lowercase φ in math mode
\Phi — capital Φ
\phi — ϕ (greek phi symbol (straight phi))
\emptyset — ∅ (empty set)

HTML, CSS and code

HTML: φ or φ or φ
CSS: content: "\03C6";
JavaScript / JSON: "\u03C6" — Python: "\u03c6"
In source code, prefer the escape over the pasted glyph — it survives every file encoding.

Full typing guide for every platform, including Linux and Google Docs → how to type Greek letters.

What does phi mean?

Mathematics

φ ≈ 1.6180339887 — the golden ratio (also written Φ)
φ(n) — Euler’s totient function
φ — the polar or azimuthal angle in spherical coordinates

Physics

Φ — magnetic or electric flux
φ — electric potential, and the work function
φ — phase angle

Statistics

Φ(z) — the standard normal CDF; φ(z) — its density
the phi coefficient φ for 2×2 tables

Culture

Φ on campus — Phi Beta Kappa and Phi fraternities and sororities

Phi at a glance

Position: 21st of 24
Uppercase / lowercase: Φ φ
Greek name: φι
Pronunciation: /faɪ/
Numeric value: 500
Became: Cyrillic Ф

Frequently asked questions

What is the phi symbol?

Phi (Φ φ) is the 21st letter of the Greek alphabet, pronounced /faɪ/ (“FIE or FEE”). It is most often used for the golden ratio, magnetic flux, angles.

How do I type the phi symbol on a keyboard?

On Windows, press Win + . → Symbols → Greek, or in Microsoft Word type 03C6 and press Alt + X; the classic Alt code Alt + 237 types φ and Alt + 232 types Φ. On a Mac, switch to the Greek keyboard and press F (Shift + F for the capital). Or simply copy it from the top of this page.

What is the LaTeX command for phi?

Use \varphi for lowercase φ and \Phi for capital Φ, inside math mode: $\varphi$ .

What is the Unicode and HTML code for phi?

Lowercase φ is U+03C6, written in HTML as φ or φ. Capital Φ is U+03A6, written Φ or Φ.

← See all 24 Greek symbols