Curtain Fabric Length Calculator
Calculate exactly how much fabric you need for your perfect curtains. Our advanced calculator accounts for fullness, pattern repeats, and various curtain styles.
Measurement Inputs
Window Measurements
Fabric Details
Curtain Style Options
Curtain Type
Heading Style
Fullness Options
Calculation Results
Required Materials
Calculation Details
How to Measure for Curtains
Measuring Track/Pole Width
- For a curtain track, measure the full width of the track.
- For a curtain pole, measure the full width between the finials (decorative ends).
- For outside mounting, measure the window plus 15-20cm on each side for optimal light coverage.
Measuring Curtain Length
- Measure from where the curtain will hang (top of track or pole) to your desired endpoint.
- For sill-length curtains: measure to 1cm above the windowsill.
- For below-sill curtains: measure to 15cm below the windowsill.
- For floor-length curtains: measure to 1-2cm above the floor.
Understanding Curtain Fullness
Fullness refers to how gathered or pleated your curtains will look when closed. The fullness ratio determines how much wider your curtain fabric needs to be than your window.
- 1.5× fullness: Minimal gathering, suitable for very large windows or budget constraints.
- 2.0× fullness: Standard gathering, provides a classic look suitable for most curtains.
- 2.5× fullness: Extra gathering, creates a luxurious look with more defined pleats.
- 3.0× fullness: Maximum gathering, creates the most luxurious, heavily pleated appearance.
Curtain Heading Styles
Pencil Pleat
Traditional heading with lots of small, pencil-like pleats. Versatile and works with tracks or poles.
- Standard fullness: 2.0×
- Easy to adjust width
- Uses curtain tape
Double (Pinch) Pleat
Elegant style with fabric pinched and sewn to create evenly spaced double pleats.
- Standard fullness: 2.5×
- More formal appearance
- Works well with heavier fabrics
Triple Pleat
Luxurious heading with three pleats grouped together for a traditional, tailored look.
- Standard fullness: 2.5×-3.0×
- Creates a formal, dramatic appearance
- Best for elegant rooms
Eyelet (Grommet)
Modern style with fabric threaded through metal rings, creating even, soft folds.
- Standard fullness: 2.0×
- Contemporary appearance
- Slides easily on poles
Tab Top
Fabric loops sewn into the top of the curtain to thread onto a pole.
- Standard fullness: 1.5×-2.0×
- Casual, relaxed look
- Best for informal spaces
Goblet Pleat
Formal heading with pleats shaped to resemble wine goblets.
- Standard fullness: 2.5×-3.0×
- Luxurious, formal appearance
- Often lined and interlined
Frequently Asked Questions
What is the difference between lining and interlining?
Lining is a layer of fabric attached to the back of curtains to protect the main fabric from sun damage and improve insulation. Interlining is an additional layer sandwiched between the main fabric and lining that adds thickness, improves drape, and enhances thermal and acoustic insulation.
How much extra fabric should I buy for pattern matching?
For patterned fabrics, it’s recommended to buy extra fabric to ensure patterns can be matched across curtain panels. Our calculator accounts for this by including the pattern repeat in calculations. For particularly complex patterns or for half-drop patterns, you may want to add an additional 15-20% to be safe.
Should I hem my curtains if they’re too long?
Yes, curtains that are too long can gather dust on the floor and look untidy. Ideally, floor-length curtains should hang about 1-2cm above the floor. For a more dramatic look, they can “puddle” on the floor with 5-10cm extra length, but this requires more maintenance.
What’s the best fullness ratio for my curtains?
The best fullness ratio depends on the look you want to achieve and your fabric type. Light fabrics generally need more fullness (2.5-3×) while heavier fabrics can work well with less fullness (1.5-2×). For a luxurious look, choose higher fullness; for a more streamlined appearance, choose lower fullness.
About This Calculator
Our Curtain Fabric Length Calculator is designed to provide accurate fabric requirements for home sewers and professional curtain makers alike. The calculator accounts for various factors that affect fabric quantity, including:
- Window dimensions and curtain specifications
- Fabric width limitations
- Pattern matching requirements
- Different heading styles
- Lining and interlining requirements
- Hem and seam allowances
All calculations are based on industry-standard practices for curtain making, ensuring you purchase the right amount of fabric for your project without excess waste.
Why Use Our Curtain Calculator?
Precision Calculations
Get exact measurements for any window size, curtain style, or fabric type with our advanced calculation algorithms.
Save Money
Avoid buying too much or too little fabric by getting precise measurements before you shop.
Customizable Options
Adjust fullness, heading styles, and fabric types to get personalized calculations for your specific project.