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Frame planning tool

Aspect Ratio Calculator (16:9, 4:3, 2.39:1)Aspect Ratio

Test crop, letterbox and delivery dimensions with your own footage, entirely in your browser.

Local image / videoPNG masks4K / DCI
×
1.33:1

Academy (4:3)

2,873×2,160
1.66:1

European Widescreen

3,586×2,160
1.85:1

Flat / Theatrical

3,840×2,076
2:1

Univisium (2:1)

3,840×1,920
2.35:1

Anamorphic

3,840×1,634
2.39:1

Scope (2.39:1)

3,840×1,607
2.76:1

Ultra Panavision 70

3,840×1,391
1.43:1

IMAX

3,089×2,160
9:16

Vertical (9:16)

1,215×2,160
4:5

Instagram Portrait (4:5)

1,728×2,160
1:1

Square (1:1)

2,160×2,160
16:9

Landscape (16:9)

3,840×2,160
3:1

Twitter Header (3:1)

3,840×1,280
2.7:1

Facebook Cover (2.7:1)

3,840×1,422
3:2

35mm Film (3:2)

3,240×2,160
4:3

Four Thirds (4:3)

2,873×2,160
4:5

Medium Format (4:5)

1,728×2,160
1:1

Square (1:1)

2,160×2,160
3:1

Panoramic (3:1)

3,840×1,280
2.2:1

65mm (2.2:1)

3,840×1,745
16:9

HD / 4K (16:9)

3,840×2,160
4:3

SD (4:3)

2,873×2,160
21:9

Ultrawide (21:9)

3,840×1,648
32:9

Super Ultrawide (32:9)

3,840×1,079
1.9:1

DCI 2K (1.9:1)

3,840×2,021

Aspect Ratio Cheat Sheet

Quick reference for common aspect ratios across cinema, social media, photography, and broadcast

Cinema

RatioNameUse Cases
1.33:1Academy (4:3)Classic films, TV broadcasts pre-HD
1.66:1European WidescreenEuropean cinema, Some IMAX presentations
1.85:1Flat / TheatricalUS theatrical releases, Drama
2:1Univisium (2:1)Netflix originals, Streaming content
2.35:1AnamorphicEpic films, Action movies
2.39:1Scope (2.39:1)Modern blockbusters, Action
2.76:1Ultra Panavision 70Epic productions, The Hateful Eight
1.43:1IMAXIMAX presentations, Nature documentaries

Social Media

RatioNameUse Cases
9:16Vertical (9:16)Instagram Stories, TikTok
4:5Instagram Portrait (4:5)Instagram feed posts, Pinterest
1:1Square (1:1)Instagram, Facebook
16:9Landscape (16:9)YouTube, Facebook Video
3:1Twitter Header (3:1)Twitter header, LinkedIn banner
2.7:1Facebook Cover (2.7:1)Facebook page cover, Event banners

Photography

RatioNameUse Cases
3:235mm Film (3:2)DSLR photography, Film photography
4:3Four Thirds (4:3)Mirrorless cameras, Compact cameras
4:5Medium Format (4:5)Portrait photography, Product photography
1:1Square (1:1)Medium format film, Instagram
3:1Panoramic (3:1)Landscape photography, Panoramas
2.2:165mm (2.2:1)IMAX film cameras, Large format photography

Broadcast

RatioNameUse Cases
16:9HD / 4K (16:9)Television, Streaming
4:3SD (4:3)Legacy content, Archive footage
21:9Ultrawide (21:9)Gaming, Ultrawide monitors
32:9Super Ultrawide (32:9)Gaming, Simulation
1.9:1DCI 2K (1.9:1)Cinema projection, DCP mastering

How to Calculate Aspect Ratio

An aspect ratio describes the proportional relationship between width and height. To calculate it, divide width by height and simplify. For example, 1920 ÷ 1080 = 1.778, which equals 16:9.

Common Resolutions & Their Aspect Ratios

ResolutionPixels (W×H)Aspect RatioCommon Name
4K UHD3840 × 216016:9Ultra HD
4K DCI4096 × 21601.90:1Digital Cinema
1080p1920 × 108016:9Full HD
720p1280 × 72016:9HD
2K2048 × 10801.90:1DCI 2K
Anamorphic2560 × 10802.39:1Cinemascope
Instagram Feed1080 × 13504:5Portrait
Instagram Reel1080 × 19209:16Vertical Video
YouTube Shorts1080 × 19209:16Short-Form
TikTok1080 × 19209:16Vertical
IMAX5616 × 40961.37:1IMAX Film
Ultra-Wide3440 × 144021:9UltraWide Monitor

The Formula

To find the aspect ratio of any resolution, divide both the width and height by their greatest common divisor (GCD):

Aspect Ratio = Width ÷ GCD : Height ÷ GCD

1920 ÷ 120 : 1080 ÷ 120 = 16 : 9

Finding Missing Dimensions

If you know the aspect ratio and one dimension, calculate the other:

Height = Width ÷ (W/H ratio)

Height = 1920 ÷ 1.778 = 1080px

Width = Height × (W/H ratio)

Width = 1080 × 1.778 = 1920px

Frequently Asked Questions

Common questions about aspect ratios and letterboxing

2.35:1 was the original CinemaScope anamorphic ratio introduced in 1953. In 1970, SMPTE standardized it to 2.39:1 (often rounded to 2.40:1) to avoid splices in the optical track area. Today, both terms are often used interchangeably, but 2.39:1 is the modern standard for theatrical releases.
Letterboxing adds horizontal black bars (top and bottom) when displaying widescreen content on a narrower display - for example, showing a 2.39:1 film on a 16:9 TV. Pillarboxing adds vertical bars (left and right sides) when showing narrower content on a wider display - like 4:3 content on a 16:9 screen.
Netflix recommends 2:1 (also called Univisium or 18:9) for original content. This ratio is a compromise between cinematic 2.39:1 and television 16:9, working well on both traditional TVs and mobile devices without excessive letterboxing.
For Instagram feed posts, 4:5 (1080x1350px) provides the most screen real estate in the feed. For Stories and Reels, use 9:16 (1080x1920px). Square 1:1 (1080x1080px) works universally but takes up less space in feeds.
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