Buying office paper — GSM, sizes and trade prices explained.

Paper is the one office supply nobody stops ordering. It's also the one where the price gap between retail and trade is widest — the same ream sold at £5.99 in a high-street stationer costs £2.30 to a trade account buying by the box. This guide covers what actually matters when you buy office paper for a UK business: weight, size, grade, quantity, and where the procurement mistakes hide.

Written by the StationeryHub trade desk for office managers, practice managers, facilities leads and buyers who sign the purchase order. If you already know what you need, skip to the paper & card catalogue and apply for a trade account for tier pricing.

1. Paper weight (GSM) — what to actually order

Paper weight is measured in grammes per square metre (GSM). Higher GSM = thicker, more opaque, more expensive. Two thirds of UK office buyers over-specify — they buy 100gsm when 80gsm would do — and pay a 30% premium for stiffness nobody notices.

The four GSM bands you actually need to know:

• 75-80gsm — everyday copier and multipurpose paper. Fine for internal print, single-sided memos, drafts, scanning. This is what 90% of UK offices should be buying. Look for a ream around £2.00-£2.50 ex VAT at trade tier.
• 90gsm — a step up. Better opacity, less show-through on double-sided print. Worth it if you print a lot of duplex material or client-facing internal documents.
• 100gsm — presentation weight. Client proposals, tender responses, contracts, letterheads. Feels "proper". Buy for the roles where the paper is judged (sales, legal, HR offer letters), not everyday admin.
• 120gsm+ — card stock territory. Business cards, dividers, covers, presentation binding. Not for general print — most printers can't feed it reliably.

Rule of thumb: if you don't remember what weight you last ordered, order 80gsm. If a document has to feel important, buy a single ream of 100gsm and keep it for those jobs only.

2. Sizes — A4, A3 and the sub-sizes worth knowing

The A-series is the UK and European standard. Every dimension below halves neatly into the next — that's the whole point of the series.

• A4 (210 × 297mm) — 95% of what an office orders. Fits every printer, every scanner, every filing system.
• A3 (297 × 420mm) — double the area of A4. Spreadsheets you can actually read, architectural drawings, large-format schedules, warehouse pick lists. Order a box a quarter for a typical office.
• A5 (148 × 210mm) — half A4. Notepads, leaflets, small notices. Usually bought as a pad, not a ream.

Two sub-sizes worth knowing exist but rarely get ordered directly: A6 (index cards) and SRA3 (320 × 450mm), which is A3 with bleed for professional print output. Only order SRA3 if your printer specifically asks for it.

3. Grades — multipurpose, copier, presentation, premium

Manufacturers use these terms inconsistently. The rough hierarchy from cheapest to most expensive:

• Multipurpose — the office workhorse. 80gsm, ColorLok-treated for laser and inkjet, brightness ~150 CIE. Fine for 90% of use cases.
• Copier — a slight downgrade optimised for high-volume copiers. Often lower brightness (~146 CIE), thinner feel. Only order if you have a legacy copier that jams on multipurpose.
• Presentation — 90-100gsm, brighter (160 CIE+), smoother finish. For client-facing output.
• Premium — usually 100gsm+, 165 CIE+, silky-smooth. Contracts, letterheads, the roles where the paper says something.

CIE brightness is a whiteness scale — most office paper sits between 146 and 170. The difference between 150 and 165 is visible to anyone comparing side-by-side, invisible in normal use. Don't pay 40% more for brightness nobody notices.

4. Certifications — FSC, PEFC, EU Ecolabel and what they mean

Three certifications matter for procurement compliance and sustainability policies:

• FSC (Forest Stewardship Council) — chain of custody from certified forest to finished ream. The most widely accepted "responsibly sourced" mark in UK public-sector and corporate procurement.
• PEFC (Programme for the Endorsement of Forest Certification) — same idea, different governance. Equivalent for most tender criteria. Some tenders accept only FSC, some accept either — check the wording.
• EU Ecolabel — European-scheme mark covering the whole life cycle (energy, water, emissions), not just forest sourcing. Rarer, stronger claim.

Recycled-content paper is a separate lever — post-consumer content is what counts (30% and 100% are the common bands). 100% recycled runs about 10-15% more expensive than virgin multipurpose at the same weight, and prints slightly less crisp. Worth it for ESG reporting, not worth it if finance signs off on cost per ream alone.

5. Quantities — ream, box, pallet economics

The industry counts paper in three units:

• Ream — 500 sheets, the smallest unit. Retail buyers order reams. Don't.
• Box — 5 reams = 2,500 sheets. The trade unit. Every office should be buying by the box; the per-ream price drops 20-30% versus buying reams individually.
• Pallet — typically 40 boxes = 100,000 sheets. For larger offices, print shops, and school-year orders. Pallet pricing beats box pricing by another 10-15%.

The break-even between box and pallet is around 5,000 sheets/month — if you're getting through 2 boxes/month you're close enough to pallet buying that the storage space usually pays for itself in the first quarter.

6. The five procurement mistakes we see most

In order of how much money each one costs an average UK office:

• Buying reams from a supermarket. The most expensive way possible to buy office paper. A £5.99 ream of 80gsm A4 costs the same office £2.30 through a trade account. If your team is doing a supermarket run for paper, the annual cost is about 3× what it should be.
• Over-specifying GSM. Buying 100gsm for everyday admin doubles your paper spend for no visible benefit. Reserve 100gsm for client-facing print jobs.
• Not standardising on one grade. Five different reams in the stationery cupboard means the highest-cost one gets used for the wrong jobs. Pick one multipurpose and one premium; kill the rest.
• Ordering monthly instead of quarterly.Every order has admin cost — approval, delivery, PO matching. Buying a quarter's worth of boxes at once quarterly typically saves 30-45 minutes of office manager time per order, on top of the pallet-tier price break.
• Not asking for a trade account. Trade pricing typically drops the per-ream cost 25-40% versus RRP. Application takes 60 seconds and most UK trade accounts approve same-day.

7. Buying in bulk — the trade-account maths

Concrete numbers, using our current pricing on A4 80gsm multipurpose (5 × 500-sheet reams per box):

A 20-person office averaging 5 reams a week gets through 260 reams a year. At retail that's £1,560. At trade tier 3 it's £988. That's a £572 saving on one product line alone — enough to pay for the account manager time it takes to set the trade account up several times over.

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