Paper is the single most repeated line item on almost every office purchase order we receive. It is also the item buyers understand least. Two reams can sit side by side at the same price and behave completely differently in the same printer — one runs clean for a week, the other jams twice a day and shows ghosting on every duplex page.
The difference usually comes down to three numbers on the wrapper, and to one thing that is not printed on the wrapper at all. This guide explains all four, so that the next time you compare quotations you are comparing paper rather than just price.
What GSM actually measures
GSM stands for grams per square metre. It is the weight of one square metre of that paper. It is a measure of mass, not of thickness, brightness, or quality — though in practice heavier paper from the same mill is usually thicker and more opaque.
The common grades in the Pakistani market:
- 65–70 GSM — economy grade. Thin, translucent, and prone to curling in humid weather. Acceptable for internal drafts and high-volume throwaway printing. Not acceptable for anything a client sees.
- 75 GSM — the most commonly quoted office grade in Karachi. A reasonable middle ground for day-to-day printing and photocopying.
- 80 GSM — the international office standard. Prints cleanly on both sides, feels substantial, and handles high-speed copiers without complaint. This is what most corporate and institutional buyers should be ordering.
- 90–100 GSM — presentation grade. Used for proposals, tenders, certificates, and reports that leave the building.
- 120 GSM and above — approaching card stock. Used for covers, dividers, and file jackets. Check your printer's maximum media weight before ordering.
Why 80 GSM usually costs less than 70 GSM
This sounds wrong, and on the invoice it is wrong — 80 GSM always costs more per ream. But the invoice is not the whole cost.
Thin paper fails in three expensive ways. It jams more often, and every jam costs you a few minutes of staff time plus the risk of a service call. It shows print through on duplex pages, which means departments quietly switch to single-sided printing and your paper consumption rises by a third. And it curls in Karachi's humidity, which causes misfeeds in high-speed copiers that are engineered around a specific media weight.
We have had clients who moved from 70 to 80 GSM and reported a drop in total monthly paper spend, because the duplex printing actually started working. If your office prints more than about ten reams a month, run the comparison properly before choosing on unit price alone.
The second number: brightness
Brightness is measured on a scale to 100 and describes how much light the sheet reflects. Most office paper sold here falls between 92 and 98.
Higher brightness gives sharper contrast on text and better colour reproduction, which matters for anything with a logo, a chart, or a photograph. It matters less for internal text documents, where 92 to 94 is perfectly adequate and costs less.
One caution: some suppliers quote a brightness figure without stating the standard it was measured against. ISO brightness and US brightness scales do not produce the same number for the same sheet. Ask which standard a quoted figure uses if the difference is material to you.
The third number: sheets per ream
A ream is conventionally 500 sheets. It is not always 500 sheets.
Short-count reams — 450, sometimes 480 — circulate in the local market, and the count is often printed in small type on the side of the wrapper rather than the face. A 450-sheet ream priced 8% below a 500-sheet ream is not a discount; it is the same paper at a slightly worse rate.
When you compare quotations, convert everything to a per-sheet or per-thousand-sheet basis. It takes a minute and it makes short-count pricing visible immediately.
The thing that is not on the wrapper: moisture
Paper is hygroscopic. It absorbs moisture from the air, and Karachi's humidity swings enough over the year to change how a ream behaves.
Paper that has been stored badly — on a warehouse floor, against an exterior wall, near a loading bay, or through a monsoon in an unconditioned godown — will curl, wave at the edges, and jam regardless of its GSM. This is the most common cause of "the paper you sent is bad quality" complaints we receive, and the GSM is rarely the actual problem.
Two practical rules. First, keep reams sealed in their wrapper until the moment of use; the wrapper is a moisture barrier and opening five reams to load a cabinet defeats it. Second, store cartons on a pallet or shelf, away from exterior walls, and let a delivery acclimatise in the office for a day before loading it into a high-speed copier.
Matching the grade to the job
A simple allocation that works for most offices:
- Internal drafts, printouts for markup, high-volume routine work — 75 GSM, 92 brightness.
- Standard correspondence, invoices, duplex printing, anything filed — 80 GSM, 96 brightness.
- Client proposals, tenders, annual reports, certificates — 100 GSM, 98 brightness.
- Covers, dividers, file jackets — 120 GSM or above, subject to your printer's media limits.
Buying one grade for everything is simpler to administer but wastes money at both ends — you either print drafts on presentation paper or send proposals out on draft paper. Two grades is usually the practical optimum for a mid-sized office.
What to specify when you ask for a quotation
A request that reads "need A4 paper rate, bulk" will get you a price for whatever the supplier has most of. A request that specifies GSM, brightness, sheet count, and monthly volume will get you a comparable price you can actually evaluate.
Include your monthly or quarterly volume even if you intend to order in smaller lots. Volume affects the rate a supplier can hold for you, and a standing arrangement is almost always cheaper than repeated spot purchases.
Talk to us
BST PVT LTD supplies A4 and Legal paper across all common grades to offices, hospitals, schools, and government institutions in Karachi and across Pakistan. If you are not sure which grade fits your equipment and your print mix, send us your monthly volume and the make of your copier and we will tell you what we would recommend — including when the cheaper grade is the right answer.