1. What is the Curtain Fabric Calculation?

The curtain fabric calculation determines how much fabric is needed to make curtains based on window dimensions, desired fullness, and various allowances for hems and headers.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• Window Width — The width of the window or area to be covered
• Fullness Ratio — How full you want the curtains (typically 1.5-3)
• Side Allowances — Extra fabric for side hems
• Fabric Width — The width of the fabric bolt
• Curtain Length — Desired finished length of curtains
• Top Allowance — Extra fabric for header/top hem
• Bottom Allowance — Extra fabric for bottom hem

Explanation: The calculation first determines how many fabric widths are needed (rounded up) then multiplies by the total length including allowances.

3. Importance of Accurate Fabric Calculation

Details: Proper fabric calculation ensures you purchase enough material for your project while minimizing waste. It accounts for pattern repeats, seam allowances, and desired fullness.

4. Using the Calculator

Tips: Measure your window accurately. Standard fullness ratio is 2-2.5 for medium fullness. Always add extra for pattern matching if using patterned fabric.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical fullness ratio?
A: Standard fullness is 2-2.5x the window width. For light fabrics use 2.5-3x, for heavy fabrics 1.5-2x may suffice.

Q2: How much should I add for allowances?
A: Typically 10-15cm for side hems, 15-20cm for top allowance (depending on heading type), and 10-15cm for bottom hem.

Q3: What if my fabric has a pattern repeat?
A: Add one pattern repeat per drop to your length calculation to ensure proper pattern matching.

Q4: Should I buy extra fabric?
A: It's wise to purchase 10-15% extra to account for mistakes, shrinkage, or future repairs.

Q5: How do I calculate for multiple curtains?
A: For pairs, divide window width by 2 before applying fullness ratio, then multiply final fabric amount by 2.