Free PDF · US Letter and A4

Aspect Ratios & Letterbox Cheat Sheet

Active picture and bar sizes for ten aspect ratios in HD and UHD, the DCP Flat and Scope containers, vertical and square crops, and the ratio each anamorphic squeeze gives you.

1 page. Every figure checked against its source on October 17, 2026.

What’s on the sheet

  • Active picture and bar sizes for ten ratios inside 1920 × 1080 and 3840 × 2160
  • DCI DCP containers: Flat, Scope and Full at 2K and 4K
  • Vertical and square frames for social at 1080 pixels wide
  • Anamorphic squeeze factors and the ratio each gives on common sensor shapes

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A table from the sheet

The same figures as the PDF, so you can check them before you print.

Letterbox and pillarbox sizesActive picture rounded to the nearest even number of pixels; bars are the pixels left on each side.
HD 1920 × 1080UHD 3840 × 2160
RatioActive pictureBars (px each)Active pictureBars (px each)
1.33 (4:3)1,440 × 1,080240 left / right2,880 × 2,160480 left / right
1.661,792 × 1,08064 left / right3,586 × 2,160127 left / right
1.78 (16:9)1,920 × 1,080—3,840 × 2,160—
1.851,920 × 1,03821 top / bottom3,840 × 2,07642 top / bottom
1.896 (DCI 4K)1,920 × 1,01234 top / bottom3,840 × 2,02667 top / bottom
2.001,920 × 96060 top / bottom3,840 × 1,920120 top / bottom
2.201,920 × 872104 top / bottom3,840 × 1,746207 top / bottom
2.351,920 × 818131 top / bottom3,840 × 1,634263 top / bottom
2.391,920 × 804138 top / bottom3,840 × 1,606277 top / bottom
2.401,920 × 800140 top / bottom3,840 × 1,600280 top / bottom

Height = width ÷ ratio (or width = height × ratio for ratios narrower than 16:9); for DCI 4K, h = W ÷ 1.896 (4096 ÷ 2160). Bars = (raster − active) ÷ 2.

Sources

Checked on October 17, 2026. Spot an error or a newer version? Email support@cinemath.app.

  1. DCI Digital Cinema System Specification v1.4.5, § 4.3.1
  2. SMPTE ST 428-1:2019, Table A.1
  3. ITU-R BT.709-6 (1920 × 1080) and BT.2020-2 (3840 × 2160)

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