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Guide

Grommet spacing and count calculator

How many grommets does a banner need? Enter size and spacing to get the grommet count including corners and the rope length.

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.

    Preset on this page

    The tool opens with a 300 × 200 cm banner, grommets on and 50 cm spacing. Change the spacing and the count updates instantly. Tick “Rope around the edge” for rope, or enter a top or bottom pole pocket.

    Formulas

    • Intermediate grommets per edge = ⌈edge ÷ spacing⌉ − 1
    • Total = 4 corners + top + bottom + 2 × side; without pockets this equals perimeter ÷ spacing, rounded up
    • Pocketed edge: no intermediate grommets, corners remain
    • Rope = 2 × (width + height) × 1.1 × quantity

    Example

    3 × 2 m at 50 cm: 5 on the top and bottom, 3 on each side, plus 4 corners = 20 grommets; rope 11 m. At 30 cm spacing the same banner needs 34 grommets. With a top pocket: 15 grommets.

    Spacing values from industry installation guides (corners mandatory, 45–90 cm; 50 cm common in Türkiye). The result is an approximate estimate.

    Last updated: 18 October 2026 · Full tool page

    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

    What grommet spacing is standard?

    50 cm is common. For wind-exposed façades, scaffolding and roofs, reduce it to 30–40 cm. Corners always get a grommet.

    How is the grommet count calculated?

    Each edge is divided by the spacing and rounded up. Including the four corners, the total is about perimeter ÷ spacing: a 3 × 2 m banner has 10 m ÷ 0.5 m = 20 grommets.

    How much rope do I need?

    The perimeter plus about 10% for tying: 10 m × 1.1 = 11 m for a 3 × 2 m banner.

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