Illustrative photograph by Art Lasovsky / Unsplash, not a branded nib sample.

Quick verdict: A fine (F) nib is a sensible first choice for everyday notebook writing. Choose extra-fine (EF) for very small handwriting or cramped planner cells, and medium (M) when you write larger and enjoy a more visible ink line. An extra-fine nib is not automatically scratchy, nor is a medium nib automatically smooth: paper, ink, nib tuning and writing angle also matter. Buy the width that fits how you actually write.

This is a manufacturer-grounded explanation of nib choices, not a claim that we personally tested the products. Sizes also vary across brands; one company’s F is not a universal millimetre standard.

EF vs F vs M: Quick Comparison

Nib	Best for	Main compromise
EF — Extra Fine	Tiny planner cells and precise notes	More sensitive to rough paper
F — Fine	Versatile everyday notebook writing	May still feel broad to tiny writers
FM — Fine Medium	Middle ground where available	Not offered by every brand
M — Medium	Large handwriting and visible ink colour	More spread on absorbent paper
B — Broad	Headings, signatures and expressive lines	More ink and greater drying demands

1. Extra Fine — Best for Very Small Handwriting

Pilot’s official CUSTOM nib guide calls its EF a nib for tiny lettering, diaries and similar small spaces. On compact pocket notebooks, the thin trace allows complete words where a broader nib fills the line. Because the contact area is small, the nib may communicate more of the paper texture, and the line can appear pale with some inks.

Buy if: you usually write tiny numbers in calendar squares. Skip if: your handwriting is large or you strongly prefer a thick, saturated stroke. Don’t blame an EF nib alone for scratchiness if its tines are misaligned.

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2. Fine — Best First Nib for Everyday Writing

The same Pilot guide recommends F for many kinds of notes, diaries and letters. It typically provides a readable line without overwhelming normal ruled pages. For a new fountain pen user, F is a practical compromise between precision and legibility, particularly when moving from a fine gel pen.

Buy if: you mostly write journal paragraphs, work notes or letters. Skip if: you want dramatic headings or exclusively make tiny marks. Paper tests are more informative than simply comparing model names.

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3. Medium — Best for Comfortable Larger Script

LAMY’s nib guide describes medium as a rounded all-round nib suitable for many writing styles, and specifically suggests wider nibs when letters are larger. A medium nib can show more of an ink’s shading, though a wetter line may take longer to dry or feather on cheap absorbent paper.

Buy if: you write loosely, enjoy the appearance of ink and use fountain-pen-friendly paper. Skip if: you need to pack a paragraph into an extremely small calendar box.

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4. Fine Medium — Best When F Feels Too Narrow

Pilot’s CUSTOM range includes FM, a grade between fine and medium intended for varied everyday writing. It’s worth trying if fine feels too delicate and medium looks too bold on your normal paper. Do not expect the grade to be stocked for every pen or interchangeable between brands; model compatibility must be confirmed before buying.

Buy if: you like the idea of a slightly fuller daily line. Skip if: you’d need to buy an expensive new pen merely to experiment. Try the existing fine nib with a different compatible ink first.

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5. Replacement Nib — Best Cheaper Upgrade When Compatible

Some pens support replacement nibs without requiring a whole new barrel. LAMY Canada’s FAQ says steel nib changes can be performed by authorized retailers, while gold nib replacement goes through its repair centre. Confirm the exact nib model and pen compatibility, and consider professional fitting instead of forcing a metal nib off yourself.

Buy if: you already love a pen’s body but consistently dislike its line width. Skip if: the pen does not have a practical replaceable nib or a new nib costs nearly as much as the pen itself.

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How Paper and Ink Change the Result

A broad wet nib typically deposits more ink than a fine nib, but some finer nibs can also run wet. On absorbent office paper, any nib can feather, and a medium line can look much wider than it does on smooth writing stock. Before replacing an expensive pen, test the same ink on another paper and let it dry completely. If the stroke looks inconsistent after cleaning, the issue may be flow or nib condition rather than grade.

Japanese vs European Nib Widths

People often describe Japanese nibs as finer than similarly labeled Western nibs, but that’s a broad tendency, not a guarantee for every model. Pilot and LAMY publish their own grade descriptions; neither company’s F label obliges the other to make an identical width. Compare actual writing samples from your intended brand, paper and ink where available, and ask a retailer whether you can test a pen in person.

Five-Minute Nib Test Before You Buy

1. Write a small calendar entry and a long sentence on your normal paper.
2. Compare the smallest letters for crowding and legibility.
3. Write at your usual angle without forcing the nib or twisting it.
4. Note dry time, ink spread and whether the nib catches paper fibres.
5. Choose the width that works over a full page, not simply the widest dramatic first stroke.

Is an Expensive Nib Worth the Upgrade?

Only when it solves a demonstrated problem. Premium materials and finishing may change writing feel, but they cannot make a broad line fit a tiny notebook box. Start with an affordable compatible nib size, try it on your usual paper and consider later upgrades after you know what you like. For many people, selecting the right line width and using decent paper offers more value than paying for a costly decorative pen.

Common Buying Mistakes

• Assuming EF, F and M have identical widths across makers.
• Buying a medium for tiny calendars because reviewers call it smoother.
• Assuming a rough or scratchy stroke can only be fixed by choosing a bigger grade.
• Using poor paper to judge every fountain pen.
• Ordering an incompatible replacement nib.
• Paying for premium gold before knowing your preferred width.

Frequently Asked Questions

Is extra-fine too scratchy for beginners?

Not necessarily. Alignment, paper and your writing pressure matter. Try a functioning EF in person rather than assuming the label determines comfort.

Which nib writes darkest?

A broader wetter nib often deposits more ink and appears darker, but ink formulation, paper and flow change the result.

Can I change a LAMY nib?

Many steel nibs are replaceable, but LAMY recommends authorized professional assistance. Confirm compatibility.

Which nib suits left-handed people?

Hand position, paper and dry time matter more than handedness alone. LAMY also lists an LH nib intended for certain left-handed grips.

Related Reading

Start with our beginner fountain pen guide and see our paper-feathering explanation before replacing an entire pen.

Affiliate disclosure: Scribblet may earn commissions from qualifying purchases through these U.S. and Canadian Amazon search links at no extra cost. We do not claim hands-on nib testing; specifications and compatibility require checking for your model.

Final Verdict

Best all-round first nib: F. Best for tiny writing: EF. Best for broad comfortable script: M. Best cheaper upgrade: a correctly matched replacement nib where the pen supports one. Select for your writing size, not prestige.