Aspect Ratio Calculator ·

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Aspect ratio calculator

Enter width and height

WxH Calculate! Aspect Ratio (short: A/R) is the width of an image or screen, divided by the height. In landscape orientation, the A/R is > 1, for portrait orientation the A/R is < 1 and for square screens, this is = 1.

Calculation

Size = 4096 x 2160 = 8.85 megapixels

Aspect ratio = 1.9

Angle of diagonal = 0.485 rad = 27.8°

Length of diagonal = 4630 pixels

Letterboxing

How does a 1.9 image fit on a screen with a different aspect ratio?

Cinema screens

Cinema 2K scope screen (2.39)

Using 79.7 % of the screen

Pillar box

Cinema 2K flat screen (1.85)

Using 96.7 % of the screen

Letter box

Cinema 2K full envelope (1.90)

Using 100% of the screen

Perfect match

Barco Escape Cinema (5.94)

Using 31.9 % of the screen

Pillar box

TV screens

HD television (16:9)

Using 93.3 % of the screen

Letter box

Extra Wide TV (21:9)

Using 81.7 % of the screen

Pillar box

SXGA/QSXGA screen (5:4)

Using 65 % of the screen

Letter box

SD television (4:3)

Using 78.3 % of the screen

Letter box

Square screen (1.00)

Using 52.5 % of the screen

Letter box

Vertical HD screen (0.56)

Using 29.2 % of the screen

Letter box

Compare

Compare to aspect ratio standards from:Video • Cinema projectors • Cinema cameras • Photo •

HDCAM NTSC DVD NTSC SVCD NTSC TV NTSC VCD PAL DVD PAL SVCD PAL VCD Quicktime HD 1080p Quicktime HD 720p Quicktime SD 480p Red 2K Red 3K Red 4K

Frequently Asked Questions

What is aspect ratio and how is it calculated?

Aspect ratio is width divided by height. A 1920×1080 screen has aspect ratio 1920÷1080 = 1.78 (or 16:9). Common ratios: 4:3 (1.33) for old TVs, 16:9 (1.78) for HD, 21:9 (2.33) for ultrawide, and 2.39:1 for cinema scope.

What is letterboxing and pillarboxing?

Letterboxing adds black bars top and bottom when showing wide content on a narrower screen (e.g., 2.39 movie on 16:9 TV). Pillarboxing adds black bars on the sides when showing narrow content on a wider screen (e.g., 4:3 content on 16:9).

What aspect ratio should I use for video?

16:9 (1.78) is the standard for YouTube, TV, and most online video. Use 9:16 for vertical social media (TikTok, Reels). Cinema uses 1.85 (flat) or 2.39 (scope). Square 1:1 works well for Instagram feed posts.

How do I convert aspect ratio to pixels?

Multiply one dimension by the aspect ratio to get the other. For 16:9 at 1080 height: 1080 × (16÷9) = 1920 width. For 4K at 16:9: 2160 × 1.78 = 3840. Always round to even numbers for video encoding compatibility.

Photo calculators & converters

Aspect ratioImage Width x Height → aspect ratio Aspect FitFit an image on a screen Composition CalculatorFocal length, distance, crop factor → image composition Depth-of-Field CalculatorAperture, focal length, distance, crop → depth-of-field DPI calculatorPrint Width x Height and dpi → megapixels Image filesize calculatorImage Width x Height JPG/RAW/PNG → bytes Light calculator (EV)Aperture, shutter time, ISO → Exposure Value Megapixel calculatorImage Width x Height → megapixels Megapixel AspectsSee megapixels in different aspect ratios Portrait distanceportrait distance, composition, crop factor, focal length