Curtain Size Calculator

Find the right curtain width and length for your window.

Enter your window size, choose a style, and get recommended dimensions instantly.

Enter Your Window Size

Input the window dimensions and curtain style.

How to Use

Get your curtain size in 3 simple steps.

Enter or Select

Enter the window width and height, then choose a curtain style.

Calculate

Calculate the recommended width and reference length.

Review & Share

Check the results and diagram, then share the page link.

Reference Guide

Useful information to choose the right curtain size and style.

Calculation Formula

Curtain Width = Window Width × Fullness
Curtain Length = Window Height
(+ optional adjustment)

ExampleIf the window is 180 cm wide and you choose Standard (1.5×):180 × 1.5 = 270 cm

Fullness (Style) Guide

Style	Multiplier	Look & Best Use
Light	× 1.2	A neat, minimal look. Good for small spaces.
Standard	× 1.5	A balanced, natural drape. The most popular choice.
Full	× 2.0	A rich, luxurious look with deeper folds. Great for living rooms and bedrooms.

Length Adjustment (Optional)

ShortWindow Height
−1–2 cm

StandardSame as window height

Floor-LengthWindow Height
+1–3 cm

Tips & Notes

Measure the window width and height accurately (cm or inches).
Standard fullness (1.5×) works well in most spaces.
For a soft, luxurious look, choose Full fullness (2.0×).
For floor-length curtains, add 1–3 cm to the height.

Real-world Examples

See how the formula works for typical windows.

Example 1

Living Room (Large Window)

Window Width × Window Height: 240 × 200 cm

Curtain Style (Fullness): Standard (×1.5)

360 × 200 cm

Example 2

Bedroom (Standard Window)

Window Width × Window Height: 150 × 140 cm

Curtain Style (Fullness): Standard (×1.5)

225 × 140 cm

Example 3

Small Window (Kitchen)

Window Width × Window Height: 90 × 100 cm

Curtain Style (Fullness): Light (×1.2)

108 × 100 cm

FAQ

Common questions about curtain sizing.

Q. What is fullness, and which option should I choose?

Light is a neat look; Standard creates balanced folds; Full makes deeper folds.

Light (×1.2)
Standard (×1.5)
Full (×2.0)

Q. Should curtain length equal window height?

Curtain width = window width × fullness. Reference length = window height. For a different finished drop, measure the actual hanging distance. Hem, header, floor clearance and shrinkage are not included.

Q. Is the width for one panel or all panels?

Measure the window accurately. The width shown is combined flat fabric width, not the width of each panel.

Q. Can I use inches?

Yes. Choose cm or in separately for width and height. One inch equals exactly 2.54 cm.

Q. Are hems and shrinkage included?

For a different finished drop, measure the actual hanging distance. Hem, header, floor clearance and shrinkage are not included.

Q. Does this work for blackout and sheer curtains?

Yes. The formula does not depend on opacity; choose the fullness that suits the fabric and check the product specifications.

Q. How should I use this for ready-made panels?

Compare the calculated total flat width with the combined listed widths of all panels. Check each panel size, overlap and mounting details before buying.