Costs
Part of How to pair a notebook and an ink that suit each other
How to price paper and ink by the page, not by the packet
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 dollar figures are quoted on this page. Prices differ by country, by retailer and by month, and a number printed here would be wrong by the time you read it. What does not go stale is the arithmetic. Once you can convert any shelf price into a cost per page, comparisons stop being guesswork and 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, which is a mass over an area, exactly as the International System of Units defines those base quantities. That makes the math straightforward.
- An A4 sheet is very nearly one sixteenth of a square meter, so ninety gram paper weighs about 5.6 grams a sheet. US letter is close enough for an estimate.
- Cost per page equals the pack price divided by the number of usable sides.
- A notebook of one hundred leaves used on both sides gives two hundred pages.
- A converter holds roughly 0.7 milliliters. A thirty milliliter bottle is about forty fills.
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 | Recurring, and 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. If you write a page a day, paper is your budget.
Why published averages will not help
It is tempting to look up an index and apply it. Price indexes are built for a different job. The Bureau of Labor Statistics keeps a plain-language explanation of the Consumer Price Index that walks through what the index measures, how to read one, whether it functions as a cost-of-living index, and what its limitations are. It is a national average across a fixed basket of goods, and 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, which is usually lower than people fear and differently distributed than they expect. That record also tells you when a bulk purchase is genuinely cheaper, which is the only case where buying deep is sensible. 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.
Common questions
Is bulk paper always cheaper per page? Per page, usually yes. Per page actually used, often no, because tastes change and paper takes up space. Buy deep only for a paper you have used for a year.
How long should a bottle of ink last? For a page a day with a medium nib, a thirty milliliter bottle commonly lasts a year or more. Track it once and you will stop wondering.
Are cartridges more expensive than bottles? Per milliliter, considerably. They buy convenience, which is a fair trade if you travel with the pen.
Should I count the cost of the pen per page? Only if it helps you decide. A pen used daily for ten years costs almost nothing per page, which is the argument for buying one good one rather than six.
