For most marketing brochures, 150gsm works well for inner pages and 250–300gsm for the cover. That pairing gives you a professional feel, keeps postage manageable, and suits both digital and litho presses. If you are printing a single-fold leaflet, 130–170gsm handles the job without needing scoring. For premium covers or menus, 300–350gsm is the standard.
Here is a quick reference range before you read further:
- Inner pages (multi-page brochures): 130–170gsm, silk or gloss coated
- Folded leaflets (single or bi-fold): 130–150gsm uncoated or silk
- Standard covers: 250–300gsm, with lamination or aqueous varnish
- High-end covers, menus, postcards: 300–400gsm, often with spot UV or foiling
One-line verdict: For a general-purpose marketing brochure, 150gsm inner pages paired with a 300gsm silk cover is the most reliable all-round specification.
Pro Tip: Ask your printer for a physical swatch of your chosen stock with the finish applied before you approve the job. A sample reveals bulk, shows how coatings render colour, and confirms fold behaviour before you commit to a full run.
Key takeaways
Choosing the right brochure paper weight comes down to matching GSM to use case, confirming compatibility with your print method, and accounting for folding, finishing, and postage before you place the order.
| Point | Details |
|---|---|
| Inner pages: 130–170gsm | 150gsm silk coated is the most reliable choice for multi-page brochure inner pages. |
| Covers: 250–300gsm | Pair with matt or gloss lamination; always specify scoring for stocks above 200gsm. |
| Score before folding | Stocks above 200gsm will crack at the fold without scoring; confirm this with your printer. |
| High-bulk saves postage | High-bulk stocks give a thicker feel at a lower GSM, keeping direct mail within lighter postage bands. |
| A3m for full specification | A3m handles stock selection, proofing, scoring, finishing, and production for brochures across the UK. |
Table of Contents
- What does GSM mean, and how does it affect your brochure?
- Which paper weights suit which brochure types?
- How do folding, binding, and finishes affect your stock choice?
- Does your print method change which stock you can use?
- How does paper weight affect cost and postage in the UK?
- What to tell your UK printer: a practical spec checklist
- Why material specification is the detail most brochures get wrong
- How A3m can help you specify and produce your brochures
- Sources
What does GSM mean, and how does it affect your brochure?
GSM stands for grams per square metre, the standard metric measurement for paper weight used across the UK print industry. A higher GSM generally means a heavier sheet, but weight and thickness are not the same thing.
Thickness is measured in microns (thousandths of a millimetre), and it depends on a paper’s bulk, not just its weight. A 300gsm silk-coated sheet can actually be thinner in microns than a 300gsm uncoated sheet, because the calendering process used to create a smooth coated surface compresses the fibres. London City Print confirms that bulk and finish both change perceived thickness, which is why two sheets with identical GSM can feel quite different in your hand.
For UK readers who encounter US print specs, the pound (lb) system is the one you will see on American supplier sheets. The conversion is approximate because lb values differ depending on whether the sheet is classified as “text” or “cover” stock. Conversion tools give practical approximations, but values vary by mill, finish, and bulk, so treat them as a guide rather than an exact figure.
Note: Micron values are typical commercial approximations. Actual thickness varies by mill, coating, and bulk grade. Always request a data sheet from your printer for exact figures.
Which paper weights suit which brochure types?
Common GSM bands map neatly onto specific print applications, and understanding those bands saves you from ordering stock that either feels flimsy or cracks at the fold.
90–120gsm: everyday and economy
This is standard office paper territory. It is rarely used for finished brochures, but it suits internal documents, draft proofs, and economy information sheets where cost per sheet matters more than tactile quality.
130–170gsm: the workhorse range for brochure inner pages
Most multi-page brochures use 130–170gsm for their inner pages. At 150gsm, a sheet feels noticeably more substantial than office paper without adding significant weight to a saddle-stitched booklet. This range also works well for single-fold leaflets and event handouts. A UK print-industry guide recommends 150gsm inner pages paired with a 250–300gsm cover as the standard pairing for a premium feel.
170–200gsm: light card and single-sheet flyers
At this weight, a sheet holds its shape well enough to stand alone as a flyer or a self-mailer. It is also a practical choice for short-run digital brochures where a separate cover stock is not practical. Folding at 200gsm starts to require care, which is covered in the next section.
200–300gsm: sturdy covers and premium single sheets
This is the cover stock range for most professional brochures. A 250gsm silk cover with a gloss or matt laminate gives a confident, premium feel. At 300gsm, the sheet approaches the weight of a light business card and suits restaurant menus, event programmes, and high-end product brochures.
300–400gsm: heavyweight card
Business cards, thick postcards, and luxury menu covers sit here. At this weight, folding without scoring is not realistic, and the stock is typically used for single-panel pieces or as a very substantial outer cover.
Pro Tip: If postage or total brochure weight is a concern, ask your printer about high-bulk stocks. A high-bulk 150gsm sheet can feel as thick as a standard 170gsm sheet because of its greater fibre volume, letting you stay in a lower postage band while still achieving a quality tactile impression.
| GSM range | Best for | Folding? |
|---|---|---|
| 90–120gsm | Proofs, economy inserts | Yes, easily |
| 130–170gsm | Inner pages, leaflets, event handouts | Yes |
| 170–200gsm | Flyers, self-mailers, light covers | With care above 200gsm |
| 200–300gsm | Brochure covers, menus, programmes | Score first above 200gsm |
| 300–400gsm | Postcards, luxury covers, business cards | Score always |
How do folding, binding, and finishes affect your stock choice?
Getting the weight right is only half the decision. How the brochure is folded, bound, and finished determines whether your chosen stock will perform well in production.
When scoring is non-negotiable
Heavier stocks above a certain weight are likely to crack at the fold without scoring. Scoring compresses the fibres along the fold line before the sheet is folded, preventing the surface coating or fibres from breaking. If your cover is 250gsm or above, always specify scoring on your print brief. Some printers include it automatically for covers; others charge it as a finishing line item, so confirm this upfront.
Finishes and how they interact with GSM
The finish you choose changes how a stock feels, how it prints, and how it folds:
- Gloss lamination: Adds rigidity and a high-sheen surface. Works well on 250–350gsm covers. Slightly increases the effective thickness.
- Matt or silk lamination: Softer feel, fingerprint-resistant. Popular for premium brochures. Can be combined with spot UV for contrast.
- Aqueous varnish: A water-based coating applied inline during printing. Less protective than lamination but adds a subtle sheen and is more environmentally friendly.
- Spot UV: A raised, glossy coating applied to specific areas. Requires a heavier base stock (typically 300gsm+) to prevent warping.
- Uncoated stock: Absorbs ink rather than sitting on the surface, giving a natural, tactile feel. Colours appear softer. Well-suited to sustainability-focused brands.
For guidance on choosing between these options, A3m’s article on large format print finishes covers the decision framework in practical terms.
Binding considerations
Saddle-stitched (stapled) booklets work well with inner pages from 90–170gsm. Perfect binding (glued spine) suits heavier inner stocks up to around 170gsm. For very thick covers combined with heavy inner pages, discuss the total spine thickness with your printer before finalising the spec.
Does your print method change which stock you can use?
Yes, and it is worth raising this with your printer before you finalise the spec.
Digital presses are the standard choice for short runs, typically under 500–1,000 copies. They handle most commercial stocks from 90gsm up to around 350gsm, but some speciality textured or heavily coated papers may not be compatible with digital toner or inkjet processes. Speciality stocks may require litho or sheet-fed production, and some have minimum order quantities that make them uneconomical for short runs.
Litho (offset) printing suits longer runs of 1,000 copies and above. It generally produces more consistent colour across a run and gives access to a wider range of specialist stocks, including uncoated recycled papers and textured boards that digital presses struggle with.
Before you confirm your stock, discuss these points with your printer:
- Run quantity: Under 500 copies, digital is usually more cost-effective. Above 1,000, litho often becomes competitive.
- Colour profile: Confirm whether the file should be supplied as CMYK or whether the printer uses a specific ICC profile for the press and stock combination.
- Stock availability: Ask whether your chosen GSM and finish are held in stock or need to be ordered, as bespoke stocks can add lead time.
- Proof options: Request a printed proof on the actual stock, not just a screen PDF, before approving a long run.
How does paper weight affect cost and postage in the UK?
Heavier stock costs more per sheet and adds weight to every copy, which matters most when you are distributing by post or in bulk.
Royal Mail’s pricing for large letters and packets is banded by weight. A standard A4 brochure printed on 150gsm inner pages with a 300gsm cover will typically weigh more than one using 130gsm inner pages, and that difference can push a mailing into a higher postage band when multiplied across thousands of copies. Choosing 130–150gsm for inner pages helps keep postage lower while still delivering a professional result.
Practical ways to manage cost and postage:
- Use lighter inner pages: Dropping from 170gsm to 150gsm on inner pages reduces weight without a visible quality drop.
- Specify high-bulk stock: A high-bulk 130gsm sheet can feel as substantial as a standard 150gsm sheet, keeping you in a lower postage band.
- Trim the size: A slightly smaller trim size reduces both paper cost and postage weight.
- Consolidate finishing: Lamination adds a small amount of weight. If postage is tight, aqueous varnish is a lighter alternative.
For direct mail campaigns, weigh a dummy copy of the finished brochure before printing the full run. Your printer can usually produce a dummy from the actual stock so you can confirm the postage band before committing.
What to tell your UK printer: a practical spec checklist
A clear brief prevents costly reprints. Here is the information your printer needs, in the order most UK suppliers expect it.
- Final trimmed size: State width × height in millimetres (e.g. 210 × 297mm for A4).
- Page count: Total number of pages including cover (e.g. 8pp = 4 sheets saddle-stitched).
- Inner page stock: GSM, finish, and coating (e.g. 150gsm silk coated).
- Cover stock: GSM, finish, and any lamination or varnish (e.g. 300gsm silk, matt laminated).
- Scoring requirement: State explicitly if the cover needs scoring before folding.
- Binding method: Saddle stitch, perfect bind, or loose leaf.
- Colour profile: CMYK, and the ICC profile if the printer specifies one.
- Run quantity: Total copies required, plus whether you need overs.
- Delivery date: Your required in-hands date, not just the print deadline.
- Sustainability preference: Request FSC-certified stock if responsible sourcing matters to your brand. FSC provides independent chain-of-custody certification for responsibly sourced paper, and the label should appear on your quote and stock data sheet. For more on building a sustainable print policy, A3m’s corporate sustainability print guidance is a useful reference.
Sample request script you can copy:
Pro Tip: Always ask for a printed paper swatch with your chosen finish before approving the job. Colour rendering on a 150gsm silk coated sheet looks noticeably different from the same artwork on an uncoated stock, and a physical sample removes the guesswork.
Why material specification is the detail most brochures get wrong
There is a tendency to treat paper weight as a secondary decision, something to confirm after the design is signed off. In practice, the stock choice shapes how the finished piece feels before a single word is read. A brochure printed on 130gsm uncoated stock and one on 170gsm silk coated carry the same information but communicate very different things about the brand behind them.
The specification also has downstream consequences that are easy to underestimate. A cover stock chosen without confirming scoring requirements can crack in finishing. A GSM selected without checking Royal Mail weight bands can push a direct mail campaign into a higher postage tier. These are not edge cases; they are the kinds of production problems that surface regularly when the brief is vague.
At A3m, we see the impact of precise material specification on brand perception every time a client holds a finished proof against an earlier version. The difference is immediate and tangible. Getting the GSM right, matching it to the right finish, and confirming the folding and binding requirements before production starts is not a technical nicety. It is what separates a brochure that represents your brand well from one that simply delivers information.
How A3m can help you specify and produce your brochures
Specifying a brochure correctly takes time, and the variables add up quickly: GSM, finish, scoring, binding, run length, postage weight, and sustainability requirements all interact. A3m’s in-house production team handles the full process, from stock selection and printed proofs through to scoring, lamination, and delivery across the UK.
We work with marketing managers, operations leads, and procurement teams to get the specification right before a single sheet goes to press. Whether you need a short digital run of 250 copies or a litho run of 10,000, we can advise on the most cost-effective stock for your format, confirm scoring and finishing requirements, and supply FSC-certified options where sustainability is a priority. Get in touch with the A3m team to discuss your brochure project, or explore our print manufacturing capabilities to see how we work.
Sources
These references are worth bookmarking if you need to verify specs or check certification: