Curtain Size Calculator

Work out the fabric length and widths to buy for curtains from your window size, fullness and hems.

Window width (inches)

Curtain drop — rod to hem (inches)

Measure from the rod to where you want the curtain to end.

Fullness

2× gives a softly gathered look.

Extra on each side (inches)

Fabric width (inches)

Hem and header allowance (inches)

For a pair of curtains, divide the widths between the two panels. Add a little extra if the fabric has a pattern.

How to use curtain size calculator

1Enter your numbersFill in the fields — example values are already there to start from.

2Adjust the optionsChange the choices to match your situation. Results update as you type.

3Read the resultsThe answer appears straight away; there is nothing to submit.

How much wider than the window the fabric is before gathering. 2× gives a soft, full look.

Measure from the rod to just above the floor, or to the floor for a formal look.

About 12 inches for the header and bottom hem together.

No. Everything is worked out in your browser and nothing you type is sent to a server.