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Calcimator

Interfacing Calculator

Calculate how much interfacing you need based on the number of pieces, average area, and waste factor. Get yards to purchase.

Inputs

sq in
in
%

Results

Yards to Buy

0.5 yd

≈ 5 credit cards

Exact Yards Needed0.46 yd
Total Area Needed331 sq in
Total Area2.3 sq ft
Waste Area43 sq in
How to Use This Calculator
  1. Enter the number of pattern pieces needing interfacing and average piece area (sq in).
  2. Set interfacing width (inches) -- typically 20-22 in for woven, 60 in for non-woven.
  3. Set waste factor (%) -- 15-20% for small pieces, 10% for large pieces.
  4. Review linear yards to buy, total area (sq in), and total sq feet.
  5. Match interfacing weight to fabric weight -- lightweight for chiffon, heavyweight for jacket facings.

How the result changes with Number of Pieces

Number of PiecesYards to Buy
3.90.5 yd
111.38 yd
202.38 yd
273.13 yd

What each input means

Number of Pieces
Number of pattern pieces that need interfacing
Avg Piece Area
Average area of each interfacing piece in square inches
Interfacing Width
Width of the interfacing bolt (typically 20" or 22")
Waste Factor
Extra percentage for cutting waste and irregular shapes

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Number of Pieces = 4, Avg Piece Area = 72, Interfacing Width = 20, Waste Factor = 15 = 4 input(s) provided
  2. Calculate Yards to Buy
    Yards to Buy
    0.5 = 0.5
  3. Calculate Exact Yards Needed
    Exact Yards Needed
    0.46 = 0.46
  4. Calculate Total Area Needed
    331 = 331

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