About MechPen

There’s a particular pleasure in a pen that suits your hand — a nib that lays down the line you pictured, a pencil grade that matches the page, a body that balances just so between your fingers. Most of the questions that get in the way of that pleasure are small and practical: which nib size actually writes fine, how far a fill of ink really goes, whether a heavier pen will tire you out, what lead to load for shading versus notes. MechPen exists to answer those questions plainly.

Rather than long buying guides you have to wade through, the site is a set of small, single-purpose tools, each aimed at one real decision. The Ink Refill Life Estimator turns a reservoir volume and a nib width into a realistic page count. The Pencil Lead Hardness Selector matches a task to a grade on the HB scale and converts between the H–B and US numbering systems. The Nib Size Converter translates a named nib size into an approximate line width and reconciles Western and Japanese sizing. The Pen Weight & Balance Comparator works out where a pen balances posted and unposted, the Ink Dry-Time Estimator gauges how long a line stays wet, and the EDC Carry-Weight Calculator adds up a pocket kit.

Alongside the tools, the blog and learnsection explain the reasoning behind them — the difference between fountain, gel, and rollerball ink, what pencil lead grades really mean, how nib sizes are measured, how to clean a fountain pen properly, and why some paper feathers while other paper doesn’t. Every article is written from scratch by someone who actually uses this gear, and the museum gathers the history of the pen, pencil, and ink from Wikipedia and Wikimedia Commons.

A few things worth stating plainly. MechPen is independent and not affiliated with any pen maker, ink brand, or stationery retailer. It is supported by advertising and by affiliate links to gear we think is worth a look, which is how the tools stay free with no account required. The calculators are estimating aids: they use sensible, documented models and round for readability, so a result is a good starting point, not a laboratory measurement. If a tool looks wrong, or there’s one you wish existed, the contact page is the place to tell us.