Bed Sheets
Bedding & Linens · 10 specs
Direct Answer
Bed sheets classify flat sheet dimensions and fitted sheet corner pocket depths: Standard (7–12"), Deep Pocket (13–17"), and Extra Deep Pocket (18–24"). True cotton thread count (ASTM D3775) peaks in quality between 200–400 single-ply threads per square inch.
Source: ASTM D3775 (Fabric Count of Woven Fabric) / Home Linen Standards · Last reviewed Aug 28, 2026
Specs
| Governing Standards | ASTM D3775 (Woven Fabric Thread Count) / ISPA Bedding Specs |
| Standard Pocket Depth | 7 to 12 inches (18–30 cm) | Basic memory foam and flat innerspring |
| Deep Pocket Depth | 13 to 17 inches (33–43 cm) | Standard pillowtop mattresses (Industry benchmark) |
| Extra Deep Pocket | 18 to 24 inches (46–61 cm) | Euro-top mattresses with separate 3" toppers |
| Twin Flat Sheet | 66 × 96 inches (168 × 244 cm) |
| Full Flat Sheet | 81 × 96 inches (206 × 244 cm) |
| Queen Flat Sheet | 90 × 102 inches (229 × 259 cm) |
| King Flat Sheet | 108 × 102 inches (274 × 259 cm) |
| California King Flat | 108 × 106 inches (274 × 269 cm) |
| Thread Count Optimum | 200 to 400 single-ply cotton threads/sq in (multi-ply counts above 500 are marketing inflation) |
Bed Sheet Sizing & Pocket Depth Matrix
| Bed Size | Fitted Sheet (W × L) | Flat Sheet (W × L) | Standard Pocket Depth | Deep Pocket Depth |
|---|---|---|---|---|
| Twin | 39" × 75" (99 × 190 cm) | 66" × 96" (168 × 244 cm) | Up to 12" (30 cm) | 13"–16" (33–41 cm) |
| Twin XL | 39" × 80" (99 × 203 cm) | 66" × 102" (168 × 259 cm) | Up to 12" (30 cm) | 13"–16" (33–41 cm) |
| Full | 54" × 75" (137 × 190 cm) | 81" × 96" (206 × 244 cm) | Up to 14" (35 cm) | 15"–18" (38–46 cm) |
| Queen | 60" × 80" (152 × 203 cm) | 90" × 102" (229 × 259 cm) | Up to 14" (35 cm) | 15"–18" (38–46 cm) |
| King | 76" × 80" (193 × 203 cm) | 108" × 102" (274 × 259 cm) | Up to 14" (35 cm) | 15"–18" (38–46 cm) |
| Cal King | 72" × 84" (183 × 213 cm) | 108" × 106" (274 × 269 cm) | Up to 14" (35 cm) | 15"–18" (38–46 cm) |