Costs
Part of How to test whether a notebook suits your fountain pen ink
Pricing a notebook and ink pairing by the page, not the shelf tag
A cost-per-page model for notebooks and ink, the arithmetic that turns a shelf price into a real number, and why published averages will not tell you yours.
No shelf prices are quoted on this page. Prices vary by country, retailer, and month. Any price printed here would be wrong by the time you read it. The worked examples use round figures you swap for your own.
The arithmetic does not go stale. Once you convert any shelf price into a cost per page, comparisons get easy. Most of the anxiety about buying paper disappears.
What to take away
- Convert every price to cost per page before you compare anything.
- Ink is almost always the cheapest part of writing by hand. Paper is the recurring cost.
- Published price averages describe a basket, not your basket.
- Weight in grams per square meter is what you are actually paying for.
The arithmetic
Paper is sold by grams per square meter, a mass over an area, the definition used by the International System of Units. The practical part is simple. A higher number means more fiber per page, so the sheet costs more and ink shows through less.
Cost-per-page inputs
- 5.6 g | weight of one A4 sheet of 90 gsm paper
- 200 pages | usable sides in a 100-leaf notebook
- 0.7 mL | ink per converter fill
- 40 fills | from a 30 mL bottle
- Cost per page equals the pack price divided by the number of usable sides.
Four numbers feed that line:
- Pack price. What the notebook costs where you buy it.
- Sheets in the pack. The count on the label.
- Usable sides per sheet. One or two, set by your pen and ink.
- Ink cost per page. Bottle price divided by the pages it covers.
A usable side is a side you can write on without the ink spoiling it. With a dry pen, both sides of a sheet count. With an ink that bleeds through, the back does not, so the divisor halves.
Ruling does not change the count. A bound edge or a torn page does.
Worked example. Suppose a 96 page notebook, 48 sheets, costs $8.00. A dry pen makes both sides usable, so the divisor is 96. Then 8.00 / 96 = $0.083 a page, about 8 cents.
The same notebook with an ink that bleeds through has 48 usable sides. Then 8.00 / 48 = $0.167 a page, about 17 cents. The shelf tag did not move. The cost per page doubled.
Ink cost per page is the bottle price divided by the pages that bottle covers. Suppose a 30 ml bottle costs $20 and covers 600 pages in your handwriting. Then 20 / 600 = $0.033, about 3 cents a page.
Coverage is the one number no label gives you. Nib width, paper and how wet the pen writes all move it, so measure it once on your own paper.
Add the two and you have the pairing: 8.3 cents plus 3.3 cents comes to about 11.6 cents a page.
Run those four numbers on anything you are considering and the ranking almost never matches the shelf price ranking.
Where the money actually goes
| Item | Typical share of a year's spending | Notes |
|---|---|---|
| Paper and notebooks | Most of it | Scales with how much you write |
| Ink | Small | One bottle can last a year or more |
| Pens | Lumpy | One purchase, then nothing for years |
| Storage and tools | Small if delayed | Large if bought before you know what you own |
The pattern is consistent: people overestimate ink and underestimate paper.
Where a year's spending goes
- Paper and notebooksmost of it
- Inksmall
- Penslumpy
- Storage and toolssmall if delayed
Why published averages will not help
It is tempting to look up an index and apply it, but price indexes are built for a different job.
The Bureau of Labor Statistics keeps a plain-language explanation of the Consumer Price Index covering what the index measures, how to read one, whether it is a cost-of-living index, and its limits. It is a national average across a fixed basket of goods. Stationery is a rounding error inside it.
Use it to understand that prices move, and then measure your own. Your cost per page is knowable to the cent, which no index can be.
Building your own record
Keep a note in the back of the control pad: date, item, price, quantity, and cost per page.
After a year, you will know your true annual spend. It is usually lower and differently distributed than people expect. That record also shows when a bulk purchase is genuinely cheaper, the only case where buying deep makes sense.
What to buy at the start is covered in what to buy first, and the pairing tests those purchases feed are in the pairing guide.
