This calculator calculates how much fabric you need for a Roman blind (Roman shade) in cm or inches and fractions. It also calculates how much lining, interlining and blackout lining you will need.

Calculator Assumptions

• Lined, Interlined or Blackout Roman blind (Roman shade)
• 6cm (2") trimming allowance on lining cut drops
• 6cm (2") trimming allowance on fabric cut drops (note not included for pattern fabrics where there is more than one cut drop as adjusted cut drops are usually longer than required)
• 2.5cm (1") rod pocket allowance RPA for each traditional rod pocket made from the lining.

This Roman blind fabric calculator is based on making blinds using the heading and hem allowances in our Roman Blind Courses. Full written explainations of the calculations the calculator is based on are given in the courses on this website.

Number of rods pockets?

To decide how many rods you need and the spacing on your blind please use our Roman blind (shade) pleat calculator. There is also guidance in STEP 2 of our Roman Blind courses.

• STEP 2- Lined Roman Blind
• STEP 2- Interlined Roman Blind
• Standard Roman Blind Pleat Calculator
• Cascading Roman Blind Pleat Calculator