Skip to content

Tool

Banner Print, Seam & Grommet Calculator

Enter your sizes to see print area, strips and seams by roll width, roll length and grommet count instantly.

Print type

Print type

Weights from our product pages; ask our branch for current stock.

Sizes

Enter finished (visible) sizes. Values are read as cm; you can also type “3 m”, “3.5m” or “3000 mm”.

    Roll and finishing

    Automatic picks the stock width with the fewest seams and least roll waste.

    Finishing

    Allowance folded and welded on each edge.

    Material folded for a pole; 0 = no pocket. No intermediate grommets on a pocketed edge.

    Always placed at the corners, then spread along the edges by spacing.

    50 cm is common; 30–40 cm in windy locations.

    Perimeter + 10% for tying.

    Advanced settings

    For cutting and edge trimming.

    Overlap of strips welded together.

    Leave on if the artwork direction does not matter; the job can lie across the roll and print without seams.

    Enter the width and height of at least one job.

    How is it calculated?

    The tool adds hem and pocket allowances to each finished size, lays the job on the roll width and compares the result for every stock roll width.

    1. Print area

      Net m² = width × height × quantity. Adding hems, pockets and waste gives the area with allowances.

    2. Strips and seams

      If the job does not fit the roll width it is split: strips = ⌈(width − overlap) ÷ (roll width − overlap)⌉, seams = strips − 1.

    3. Grommets

      Each edge has ⌈edge ÷ spacing⌉ gaps; including the four corners the total ≈ perimeter ÷ spacing, rounded up.

    4. Rope and rolls

      Rope = perimeter × 1.1. Rolls = total length ÷ roll length, rounded up.

    Frequently asked questions

    How do I calculate banner square metres?

    Convert the finished size to metres and multiply: 3 m × 2 m = 6 m², then multiply by quantity. The material you buy is more than that: hems (about 3 cm per edge), waste and roll offcut are added. A 3 × 2 m banner printed on a 320 cm roll uses about 6.9 m² of material.

    What grommet spacing should I use?

    The common spacing is 50 cm; for façade and scaffolding banners in windy places it is reduced to 30–40 cm. Corners always get a grommet. The approximate count is perimeter ÷ spacing: a 3 × 2 m banner has a 10 m perimeter, so 20 grommets at 50 cm.

    Where is the seam and is it visible?

    If the short side of the job is wider than the roll, it is printed in strips that are overlapped 4–5 cm and welded. The seam runs along the roll direction and is visible up close; it is usually not a problem on façades seen from a distance. The tool also tries rotating the job (if the artwork allows) to avoid the seam.

    Should I choose 380 g or 510 g banner?

    380 g coated banner is the common, economical choice for short to medium-term outdoor posters, campaign and construction banners. 510 g coated banner is stronger and resists tearing and sagging better; choose it for long-term, large or wind-exposed installations.

    When should I use mesh banner?

    On building façades, scaffolding wraps and large wind-exposed surfaces. Its perforated structure lets part of the wind through and reduces the load on the structure. Colours look slightly lighter than on solid banner, so it is not suited to small text read up close.

    Related product groups