Welt Pocket Calculator — Single & Double Welt
Calculate dimensions for single welt and double welt pockets including pocket bag and interfacing.
Height of each welt lip
How We Calculate This
Welt pocket pieces are calculated from the pocket opening dimensions plus seam allowances.
Cutting dimensions
- Welt piece: Pocket width + 3cm × Welt height doubled + 3cm + ease
- Pocket bag: Pocket width + 3cm × Pocket depth doubled + 3cm
- Interfacing: Pocket width + 4cm × Welt height + 4cm
Frequently Asked Questions
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Last updated: February 2026
All calculations are estimates. Always verify quantities before cutting or purchasing fabric.