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Lining Calculator — Fabric & Felt for Boxes

Calculate fabric or felt quantities for lining boxes and cases.

Line the base
Line the sides
Line the lid

How We Calculate This

This calculator estimates the fabric or felt needed to line the interior surfaces of a box.

Area calculation

Base = Length x Width

Sides = 2(L x D) + 2(W x D)

Lid = Length x Width

Each piece includes a 20mm overlap allowance for folding and trimming. The fabric length is calculated based on the roll width to determine how much linear fabric to purchase.

Frequently Asked Questions

Last updated: February 2026

All calculations are estimates. Always verify measurements and material quantities before cutting or purchasing.