There are many online shops offering wide range of curtains, some even offer custom made.
But I will be providing the basic guideline for home DIYers that would like to save few hundreds (probably thousands) if you purchase your curtains online.
Step 1
Which type of curtain you are having? Rod/ hook type?
Step 2
Measure the width and height of your windows/ sliding doors.
If the width is 70cm, you should get the curtain width of 140cm. Normally just multiply two after you have measured the width. If you can't get the width that you needed from the online store, you can multiply 1.5 from the original width.
The height of the curtains is rather simple, do need to multiply at all.
