Snap Spacing Calculator — Even Snap Placement
Calculate even snap placement and quantities.
How We Calculate This
The first snap sits at the top offset and the last snap sits at the bottom offset, so the remaining snaps divide the span between them into equal gaps. Spacing is the usable span divided by the number of gaps, where the number of gaps is one less than the number of snaps.
The formula
Usable length = Closure − Top offset − Bottom offset − (2 × Placement inset)
Spacing = Usable length ÷ (Snaps − 1)
Placement inset is an optional Advanced Option (default 0). With the default inset the usable length is simply Closure − Top offset − Bottom offset.
Frequently Asked Questions
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Last updated: February 2026
All calculations are estimates. Always verify quantities before cutting or purchasing fabric.