Curtain Heading Types: Fullness Ratios and Fabric Requirements

Why Heading Style Is the Most Important Variable

Before you buy a single yard of fabric, you need to know the heading style. It determines the fullness ratio — and fullness ratio has the biggest single impact on how much fabric you need.

On a pair of 48”-wide floor-length panels (84” drop):

• Eyelet (1.75×) — about 8 yards
• Pencil pleat (2.25×) — about 10 yards
• Pinch pleat 3-finger (2.75×) — about 12 yards

That’s 50% more fabric for pinch pleat vs eyelet on the same window.

1. Eyelet / Grommet Curtains

Fullness ratio: 1.75× (range: 1.5–2×)

Metal rings punched through the top of the fabric. The pole threads directly through the rings. Creates uniform, evenly spaced folds.

Requirements:

• Pole diameter must fit through the ring inner diameter (typically ¾”–1.6”)
• Cannot be used with curtain tracks — rings need a pole
• Top hem must be reinforced (eyelet interfacing or heading buckram)

Fabric note: The top hem allowance for eyelets is standard (4”). No rod pocket needed. The finish looks clean from the front; the back shows the rings.

Best for: Bedrooms, living rooms, modern interiors. Easiest to install and take down.

2. Pencil Pleat Curtains

Fullness ratio: 2.25× (range: 2–2.5×)

The most widely used heading in the UK. A woven heading tape is sewn along the top; cords in the tape are pulled to gather the fabric into tight uniform pleats.

Requirements:

• Pencil pleat tape sewn to wrong side of top hem
• Triple hooks (used with rings on a pole, or runners on a track)
• No buckram or interfacing required — tape handles structure

Fabric note: Buy at the generous end of the range (2.25–2.5×) for full, professional-looking pleats. At 2×, pleats look thin. The tape cords are adjustable, allowing you to loosen or tighten fullness after making.

Best for: Traditional and transitional rooms. Works on both poles and tracks.

3. Pinch Pleat Curtains (2-Finger)

Fullness ratio: 2.25× (range: 2–2.5×)

Hand-sewn or tape-created pleats are pinched into groups of 2 and sewn at the base. The pleats are structured, formal, and permanent (unlike pencil pleat which can loosen).

Requirements:

• Buckram or stiff heading tape for structure
• Curtain hooks inserted into pleat base (1 hook per pleat)
• Requires precision in pleat spacing — calculate spacing before making

Pleat spacing formula:

Number of pleats = (cut width - finished width) ÷ inches per pleat group
Spacing between pleats = finished width ÷ (number of pleats + 1)

Best for: Formal dining rooms, traditional living rooms. Expensive to make but luxurious in appearance.

4. Pinch Pleat Curtains (3-Finger)

Fullness ratio: 2.75× (range: 2.5–3×)

Same as 2-finger pinch pleat but each pleat is pinched into 3 fingers. The pleats are fuller and more pronounced. Requires the most fabric of any standard heading.

Requirements: Same as 2-finger pinch pleat.

Fabric note: At 2.75×, a 48”-finished panel needs about 135” of cut width — that’s 3 widths of 45” fabric. Budget significantly more fabric per window than any other heading.

Best for: High-end interiors, formal living rooms, period properties.

5. Wave / S-Fold Curtains

Fullness ratio: 2.0× (fixed)

Wave curtains hang in continuous, uniform S-shaped curves. Unlike pleated headings, the wave pattern is set by the spacing of wave gliders on a specialist track — the fabric fullness must be exactly 2× for the curves to form correctly.

Requirements:

• Specialist wave track (standard curtain rods/poles won’t work)
• Wave gliders spaced evenly (typically every 3”–4”)
• Heading tape or hook tape sewn to back
• Fullness must be kept at 2× — not adjustable after making

Fabric note: Unlike pencil pleat, the 2× fullness is not adjustable after cutting. Measure and cut accurately.

Best for: Contemporary, minimalist interiors. Hotels and commercial installations. For the full wave fabric calculation including glider count, see How to Calculate Fabric for Wave Curtains.

6. Rod Pocket Curtains

Fullness ratio: 1.75× (range: 1.5–2×)

A channel (pocket) sewn along the top of the curtain slides directly onto the curtain rod. No rings, hooks, or tape required.

Cut length adjustment: Add 4” to the cut length for the rod pocket header (a 2” pocket with a 2” ruffle above the rod).

Requirements:

• Pole must fit into the pocket (check pocket diameter vs pole diameter)
• Cannot slide easily on thick or heavy poles — friction can be high
• Spreading and gathering the curtain to open/close the pocket wears the fabric over time

Fabric note: The extra 4” cut length is often overlooked. The calculator adds this automatically when rod pocket is selected.

Best for: Kitchen, bathroom, casual rooms. Lightweight to medium-weight fabrics.

7. Tab Top Curtains

Fullness ratio: 1.5× (range: 1.5×)

Fabric loops (tabs) are sewn to the top of the curtain and thread onto the pole. Creates a casual, relaxed look with wide, loose folds.

Requirements:

• Pole threads through tabs — cannot use a track
• Tab length must be long enough to loop over the pole (add tab size to cut length)
• Extra fabric for the tabs themselves (not calculated in the main formula)

Fabric note: Uses the least fabric of any gathered heading (1.5×). The folds are very wide and spaced — appropriate for casual rooms but not suitable where privacy or full blackout is needed.

Best for: Beach houses, casual rooms, children’s rooms.

8. Flat Panel / Roman Shade

Fullness ratio: 1.0× (no gathering)

The fabric is cut exactly to finished size plus hems — no extra fullness. Used for Roman blinds, modern flat-panel curtain treatments, and café curtains.

Requirements: None beyond accurate hemming. No heading tape, rings, or fullness.

Fabric note: Most fabric-efficient heading style. Calculation is simply: cut width = finished width + side hems; cut length = drop + top and bottom hems.

Best for: Roman blinds, modern interiors, tight-budget projects. Before cutting any heading style, see How to Measure Windows for Curtains for drop and width measurement.

Heading Comparison Table

Bold = key value to note per column.

Use the Curtain Fabric Calculator to calculate exact yardage for your chosen heading style and window size.

See also: How to Calculate Fabric for Pinch Pleat Curtains and Eyelet vs Pencil Pleat Curtains.