Custom Boxes Empire / Connected packaging
Tri-fold (roll fold) panel width calculator
Panel widths for a roll-fold leaflet or insert card.
How it works
Outer panels = (flat width + reduction) ÷ 3; the inner panel is narrower by the reduction so it folds in neatly.
Tip
About 1.5–3 mm (1/16–1/8 in) reduction suits most papers.
Questions
Letter tri-fold?
11 in flat gives two 3.68 in panels and one 3.62 in.
Thicker card?
Increase the reduction.
Planning estimate only. Confirm sizes, strength and costs with samples and your written quote.
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