Fountain Pen Nib Sizes Explained: The Ultimate Guide to Finding Your Perfect Stroke

Have you ever bought a "Fine" nib from a German brand only to find it writes like a "Medium" from a Japanese brand? You aren’t alone. The nib is the soul of the fountain pen, but understanding the difference between an EF, M, and Music nib can feel like learning a new language.

At Pen Planet, we believe the right nib can transform your handwriting. Whether you’re a fan of the precision of Pilot or the bold wetness of Pelikan, this guide (and our master tipping chart) will help you choose with confidence.

1. The Standard Line-Up: EF to BB

Most luxury pens follow a standard scale, but the actual line width (measured in millimeters) varies wildly between manufacturers.

EF (Extra Fine): Ideal for those with tiny handwriting or those using absorbent, low-quality paper.
F (Fine): The most popular choice for daily note-taking.
M (Medium): The "Goldilocks" of nibs. It shows off ink color (shading) while remaining practical.
B (Broad) & BB (Double Broad): These are for bold signatures and "ink-heavy" writing.

2. Specialty Nibs: Beyond the Basics

If you want your writing to have flair, look toward these specialty grinds:

Stub & Italic: These nibs are flat-shaped. They create thick vertical lines and thin horizontal lines, giving you natural calligraphy vibes without trying.
Music Nib: Traditionally featuring two or three tines, these are designed to write musical scores but are loved by collectors for their extreme wetness and stub-like character.
Zoom (Sailor Exclusive): A genius nib where the angle of your hand determines the line width. Hold it high for a Fine line; hold it low for a Double Broad.
Coarse (Platinum Exclusive): Essentially a "Triple Broad." It is incredibly smooth and lays down a massive amount of ink.

3. The Great Divide: Japanese vs. Western Nibs

As a general rule of thumb: Japanese nibs (Pilot, Platinum, Sailor) run one size finer than Western nibs (Lamy, Pelikan, Visconti). A Japanese "Medium" usually writes like a Western "Fine." This is because Japanese characters require more precision and finer strokes than the Latin alphabet.

4. The Master Nib Tipping Size Chart (mm)

To help you compare across brands, we’ve compiled the tipping sizes for the world's leading manufacturers. Use this to find your "sweet spot" in millimeters.

Brand	EF	Fine	Medium	Broad	Stub/Italic	Special
Aurora	0.3mm	0.4mm	0.5mm	0.7mm	1.0mm	-
Lamy	0.4mm	0.5mm	0.6mm	0.9mm	1.1mm	-
Pelikan	0.4mm	0.5mm	0.7mm	0.8mm	1.4mm	-
Pilot / Namiki	0.2mm	0.3mm	0.5mm	0.6mm	1.1mm	-
Platinum	0.2mm	0.3mm	0.4mm	0.6mm	-	0.1mm (UEF) / 1.5mm (Music)
Sailor	0.2mm	0.3mm	0.5mm	0.6mm	-	1.2mm (Music) / 1.0mm (Zoom)
TWSBI	0.3mm	0.4mm	0.5mm	0.8mm	1.1mm	-
Visconti	0.3mm	0.4mm	0.6mm	0.8mm	-	-
Kaweco	0.3mm	0.4mm	0.5mm	0.8mm	1.1mm	-
Esterbrook	0.3mm	0.4mm	0.5mm	0.8mm	1.1mm	-
Bock (Nib Maker)	0.3mm	0.4mm	0.5mm	0.8mm	1.1mm	1.5mm (Stub)

Note: These measurements are approximate. Ink flow and paper type will also affect how wide a line appears on the page!

Which Nib Should You Choose?

For Office Work: A Japanese Fine or Western Extra Fine.
For Letter Writing: A Medium or Broad to show off beautiful ink colors.
For Signatures: A Broad or a 1.1mm Stub for that "Executive" look.
For Art/Sketching: A Platinum UEF (Ultra Extra Fine) or a Sailor Zoom.

Visit Pen Planet Today

Still confused? At Shiv Enterprises (Pen Planet), we are the experts in luxury writing. Located in Ramesh Nagar, Delhi, we invite you to experience these nibs firsthand.

🌐 Shop Nibs & Pens: www.penplanet.in