How to Calculate Fabric for Grommet Curtains
Grommet curtains use the same formula as standard curtains, with one difference: the header allowance is typically 4-5 inches to accommodate the grommet tape, compared to 3 inches for rod pocket curtains.
Grommet Curtain Fabric Formula:
Widths needed = (Window Width × Fullness) ÷ Fabric Width (round up)
Cut length per panel = Drop + Hem (4") + Grommet Header (5") + Bottom Hem (4")
Total yards = Cut length × Widths × Panels ÷ 36 × (1 + Waste%)
Widths needed = (Window Width × Fullness) ÷ Fabric Width (round up)
Cut length per panel = Drop + Hem (4") + Grommet Header (5") + Bottom Hem (4")
Total yards = Cut length × Widths × Panels ÷ 36 × (1 + Waste%)
Grommet Curtain Yardage Chart (54" Fabric)
| Window Size | Panels | Fullness | Yardage | Notes |
|---|---|---|---|---|
| 36" × 60" | 1 | 2x | 2.25 yd | 2 widths, 5" grommet header |
| 48" × 84" | 2 | 2x | 5.5 yd | 2 widths per panel |
| 72" × 80" | 2 | 2x | 5.5 yd | 2 widths per panel |
| 96" × 96" | 2 | 2x | 7.0 yd | 2 widths per panel |
Grommet Spacing Guide
For professional-looking grommet curtains, space grommets 6-8 inches apart. For a standard 54" fabric width panel: use 7-8 grommets spaced 6-7 inches apart. Grommet inner diameter of 1.5-2 inches works for most curtain rods up to 1.5" diameter.