Curtains

Start from the app’s rectangular-piece template. Choose a size, adjust your measurements and calculate the fabric before cutting.

How the calculation works

Each piece is cut 1 cm larger on every edge, so its width and its length each grow by 2 cm.

A worked example: Curtains, Window 120 cm · 48 in

Fabric width: 140 cm
Seam allowance per edge: 1 cm
Usable fabric width: 140 cm

Panel × 2 — Width: 135 cm + 2 × 1 cm = 137 cm · Length: 240 cm + 2 × 1 cm = 242 cm

Where each piece sits on the fabric

Panel 1: 137 cm × 242 cm — x 0 cm · y 0 cm
Panel 2: 137 cm × 242 cm — x 0 cm · y 242 cm

x: distance from the fabric edge · y: distance along the fabric length

Required: 484 cm · 4.84 m · 5.29 yd
Unused fabric area (%): 2.1

A worked example: Curtains, Window 120 cm · 48 in (Inches)

Fabric width: 54 in
Seam allowance per edge: 0.5 in
Usable fabric width: 54 in

Panel × 2 — Width: 51 in + 2 × 0.5 in = 52 in · Length: 92 in + 2 × 0.5 in = 93 in

Required: 186 in · 4.72 m · 5.17 yd

Length needed for each template size and fabric width

Window 90 cm · 36 in: 110 cm → — · 140 cm → 484 cm · 150 cm → 484 cm
Window 120 cm · 48 in: 110 cm → — · 140 cm → 484 cm · 150 cm → 484 cm
Window 180 cm · 72 in: 110 cm → — · 140 cm → 968 cm · 150 cm → 968 cm

Panel: 137 cm wide with seam allowance, wider than the 110 cm fabric.

Window 90 cm · 36 in: 44 in → — · 54 in → 186 in · 60 in → 186 in
Window 120 cm · 48 in: 44 in → — · 54 in → 186 in · 60 in → 186 in
Window 180 cm · 72 in: 44 in → — · 54 in → 372 in · 60 in → 372 in

Panel: 52 in wide with seam allowance, wider than the 44 in fabric.

Template sizes and pieces

Measurements do not include seam allowance. The calculator adds it to each edge.

Fabric width: 140 cm · 54 in
Seam allowance per edge: 1 cm · 0.5 in

Piece	Width × Length (cm)	Width × Length (in)	Quantity
Template size: Window 90 cm · 36 in
Panel	135 × 240	51 × 92	2
Template size: Window 120 cm · 48 in
Panel	135 × 240	51 × 92	2
Template size: Window 180 cm · 72 in
Panel	135 × 240	51 × 92	4

Projects

Tablecloth

140 × 220 cm · 56 × 84 in

Napkin set

6 × 45 cm · 6 × 18 in

Tote bag

36 × 38 cm · 14 × 15 in

Drawstring bag

25 × 30 cm · 10 × 12 in

Try a tool

Try it here, without an account.

Fabric yardage calculator

Lay out rectangular pieces across your fabric width, with grain direction and seam allowance.

Compare fabric widths

Change the usable fabric width and compare the length needed for the same pieces.

Fabric cost calculator

Convert your required length into metres or yards, add your own waste allowance and estimate the purchase cost.