How much extra fabric do pleats need?

Box pleats use 3× the finished width (each pleat takes 3× its visible width in fabric). Knife pleats use 2×. Inverted pleats (box pleats reversed) also use 3×. A kick pleat uses approximately 1.5×.

A box pleat has two folds that face away from each other, creating a flat panel on the outside with the excess fabric hidden behind. It uses the most fabric but gives a crisp, structured look.

How wide should pleats be?

Common pleat widths are 2.5–5cm for skirts, 5–8cm for kilts, and 1–2cm for fine pleating. The pleat width is the visible width on the outside of the garment.

SewCalcs

Pleat Calculator — Box, Knife & Inverted Pleats

Calculate fabric needed for box pleats, knife pleats and inverted pleats.

Finished Width

Pleated section width when finished

Pleat Type

Pleat Width

Visible width of each pleat

How We Calculate This

Pleat fabric requirements depend on the pleat type. Each type folds the fabric differently.

Fabric multipliers

Box pleat: 3× finished width
Knife pleat: 2× finished width
Inverted pleat: 3× finished width
Kick pleat: 1.5× finished width

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates. Always verify quantities before cutting or purchasing fabric.