Pi Symbol (π)

The pi symbol (π) is the famous circle constant ≈ 3.14159 — the ratio of a circle's circumference to its diameter.

Greek Small Letter Pi · U+03C0 · Math Symbols

Click the symbol or the button to copy it, then paste it anywhere — documents, messages, bios and code.

Pi Symbol codes

Code	Value
Unicode code point	`U+03C0`
Unicode name	`Greek Small Letter Pi`
HTML named entity	`π`
HTML decimal	`π`
HTML hex	`π`
CSS content code	`\3C0`
JavaScript / JSON	`\u03C0`
Windows Alt code	`Alt+227`
LaTeX	`\pi`

Pi Symbol variants (3)

3 related glyphs — click any tile to copy it. Tiles with a page open that symbol's own page.

ΠGreek Capital Letter Pi∏N-Ary Product∐N-Ary Coproduct

Meaning & usage

π is the Greek letter pi, borrowed by maths to name the circle constant: circumference ÷ diameter, always ≈ 3.14159, with decimals that never end or repeat. It appears wherever circles, waves and rotations do — geometry, engineering, even probability.

Its capital form Π means 'product' in maths. Alt+227 types the lowercase π on Windows, and Option+P works on a Mac.

Examples in use

Area of a circle = πr²
π ≈ 3.14159265
Pi Day is celebrated on 14 March (3/14)

How to type the pi symbol

Windows

Hold the Alt key and type 227 on the numeric keypad (Num Lock on), then release Alt. The code is Alt+227. It also works in Word with the same keys.

Mac

Press Option+P (Mac, US keyboard layout).

iPhone & Android

Most phone keyboards have no built-in key for π. Open this page on your phone, tap Copy, then paste it into your message or bio. (On Android, Gboard's emoji search finds some symbols by name.)

Linux

Press Ctrl+Shift+U, type 03c0 and press Enter (works in most GTK apps and terminals with IBus). Or copy it from this page.

Frequently asked questions

How do I type π on a keyboard?

On Windows, hold Alt and type 227 on the numeric keypad. On a Mac, press Option+P. Or copy π from this page.

How many decimal places of π are there?

Infinitely many — π is irrational, so its decimals never end or repeat. Computers have calculated over 100 trillion digits; 3.14159 is plenty for everyday use.

What is the difference between π and Π?

Lowercase π is the circle constant. Capital Π is the product operator in maths (multiply a series) and a Greek capital letter.

Why does π sometimes show as a box or question mark?

The box (called tofu) means the device or font viewing it has no drawing for U+03C0 (Greek Small Letter Pi). The character itself is fine — try a different font or a newer device, or use one of the variants on this page.

Is the Pi Symbol free to use?

Yes. π is a standard Unicode text character published in the Unicode Character Database. You may use it in personal and commercial documents, designs and products without permission or payment.