Editorial calculator · free in CineMath

Aspect Ratio Calculator

Pixel dimensions for any aspect ratio, anamorphic desqueeze, and fit or fill to a delivery size.

Aspect Ratio finds the largest frame of a given ratio inside your resolution, desqueezes anamorphic footage, and scales to a delivery size with fit, fill or stretch. It includes the old Sizing calculator.

Try it free in your browser

CineMath Aspect Ratio on iPhone: a 16:9 frame inside a 4096 × 2160 source is 3840 × 2160 px, 1.778:1 and 8.29 MP, drawn with 128 px unused on each side

Worked examples

Worked examples
SourceTargetFrame
1920 × 10802.39:1About 1920 × 803, with bars of about 138 px top and bottom
1080 × 10804:5864 × 1080

What you enter

  • Source resolution
  • Target aspect ratio: 1.33, 1.43 (IMAX), 1.66, 1.85, 2.35, 2.39, 16:9, 9:16, 1:1, 4:5, 3:4, 5:4, or custom
  • Anamorphic squeeze, 1.25 to 2.0×
  • Scaling: Fit, Fill, Stretch or a custom percentage, to a target size
  • Reference sizes at standard containers (720p to 8K) or multiples

What you get

  • Resolution, aspect ratio and pixel count
  • Scaled dimensions and scale percentage
  • Letterbox, pillarbox or crop in pixels

How CineMath works it out

  • The largest frame of the target ratio that fits inside the source, limited by width or height
  • Smart rounding (the default) snaps to even, encoder-friendly sizes; Exact rounding keeps the computed value

A frame diagram shows the picture area and the unused pixels.

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