B4 size

250 × 353 mm · 9.84 × 13.9 in · 708.7 × 1000.6 pt

Where it comes from

Half of B3: the B3 sheet's long side (500 mm) halves and rounds down to 250 mm — ISO 216's halve-and-floor rule.

Derived from the ISO 216 construction — no lookup required, only arithmetic.

Pixels at print resolutions

DPIPixels (portrait)Typical use
72709 × 1001legacy screens
96945 × 1334CSS reference
1501476 × 2085everyday print
3002953 × 4169quality print
6005906 × 8339fine art / line work

The family

  • Fold B3 in half and you're holding B4.
  • Fold B4 in half and you get B5 — two of those side by side rebuild this sheet.
  • Area: 0.0883.