Greek and math symbols
Pi Symbol π
Tap π, Π, ∏, or ϖ to copy the exact character. Copy π or choose the exact related character you need. HTML and LaTeX codes are beside each symbol; the optional circle scratchpad keeps formulas and decimal results separate.
Copy a pi symbol
Choose the exact character first. The large button copies the symbol; the smaller buttons copy source code.
The usual circle constant.
A Greek capital letter, not a product operator.
N-ARY PRODUCT for multiplied sequences.
A variant form used in some math notation.
Copies plain text, HTML entities, or LaTeX commands.
Copying and circle calculations happen in your browser. ToolNeko does not send the radius or clipboard text to analytics. A destination app controls the pasted symbol's font.
Choose by task
Which pi symbol should I use?
Use π, U+03C0 GREEK SMALL LETTER PI, for the circle constant and most everyday references to pi. Π, U+03A0 GREEK CAPITAL LETTER PI, is the uppercase Greek letter. Changing case changes the character; it is not a style setting.
Use ∏, U+220F N-ARY PRODUCT, for a product over a sequence. It can look like capital Π in some fonts, but it is a separate math operator with separate spacing and semantics. Use ϖ, U+03D6 GREEK PI SYMBOL, only when the notation calls for the variant form commonly written as \varpi in LaTeX.
How to type the pi symbol
For the quickest cross-device method, copy the large π button above and paste it into your document, message, spreadsheet, or code editor. In Microsoft Word on Windows, type 03C0 and press Alt + X to convert the code to π. That Word shortcut is not universal across every app.
On Mac, open Edit → Emoji & Symbols, search for pi, and choose the Greek character. On a phone or tablet, copying from this page avoids switching keyboards. The destination app and its font control the final appearance.
Pi in circle formulas
For a circle with radius r, circumference is C = 2πr and area is A = πr². The scratchpad uses the browser's numeric approximation of π, so its decimal result is rounded to the number of places you choose; the symbolic line keeps π exact.
Radius and circumference use the same unit. Area uses the square of that unit. A radius of zero is accepted as a degenerate circle with circumference and area equal to zero; a negative radius is rejected.
HTML and LaTeX formats
In HTML source, π produces π, Π produces Π, and ∏ produces ∏. The varpi button uses the numeric reference ϖ. For ordinary text, copy the rendered character instead of its entity.
In LaTeX math mode, use \pi, \Pi, \prod, or \varpi. The buttons copy the bare command without math delimiters, so add the syntax required by your document or renderer.
Sources and standards
Frequently asked questions
How do I copy the pi symbol?
Tap the large π button and wait for the copied message. It copies U+03C0 as plain text. If clipboard access is blocked, select the displayed symbol manually.
Are Π and ∏ the same symbol?
No. Π is the Greek capital letter Pi, U+03A0. ∏ is the N-ARY PRODUCT operator, U+220F. They may look similar, but they have different semantics and code points.
What is the HTML code for π?
Use π or the numeric reference π in HTML source. To paste visible text into a message or document, copy π instead.
What is pi in LaTeX?
Use \pi in math mode for π. Capital Pi is \Pi, the product operator is \prod, and the variant form ϖ is \varpi.
Does the circle calculator use exact pi?
The formula line keeps π symbolic. Decimal circumference and area use the browser's Math.PI approximation and are rounded to 2, 4, or 6 decimal places.