Pen & Writing Tools & Calculators
Free, practical tools for pen and paper lovers — price your ink per page, time a piece of writing, see how long a bottle of ink lasts, and look up nib sizes, paper weights, and pencil grades.
Ink Cost Per Page Calculator
Work out what your ink really costs per page — from a cartridge price and pages per cartridge, or a bottle's volume and how much ink a page uses — plus cost per 1,000 pages
Writing Time Calculator
Estimate how long a piece takes to write by hand or by typing from a word count and your speed, how many pages it fills, and how many words you can write in the time you have
Ink Bottle Life Calculator
See how long a bottle of fountain-pen ink lasts — how many pen refills, how many pages, and how many days and years that is at your own writing pace
Fountain Pen Nib Size Guide
A curated reference of nib sizes from Extra Fine to Double Broad plus stub italics, with typical line widths in millimetres, what each is good for, and how Japanese nibs run a size finer
Paper Weight & GSM Guide
Convert paper weights between gsm and US pounds across bond, text, and cover, and look up common stocks with their use-cases and how well they take fountain-pen ink
Pencil Grade Guide
The full graphite scale from 9H to 9B — hardness and darkness, how the HB letters map to US numbers (a #2 pencil is HB), and what each grade is best for, from drafting to sketching