Free OnlineCalculators & Converters
Aspect Ratio Calculator
Calculate aspect ratios for images and videos. Find dimensions while maintaining proportions for any screen or media.
aspect ratio calculatorimage ratiovideo aspect ratioscreen ratio calculatorresize proportions
Aspect Ratio
16:9
Decimal Ratio
1.7778
Megapixels
2.07 MP
Visual Preview
1920 x 1080
Common 16:9 Resolutions
Common Aspect Ratios
1:1
Square (Instagram)
4:3
Classic TV/Monitor
3:2
Classic Film/DSLR
16:9
Widescreen HD
16:10
Widescreen Laptop
21:9
Ultrawide
9:16
Vertical Video (TikTok, Reels)
2:3
Pinterest Pin
4:5
Instagram Portrait
1.85:1
Cinematic
2.39:1
Anamorphic Cinema
3:4
Portrait Photo
Key Features — Aspect Ratio Calculator
Calculate ratio from any width and height
Resize dimensions maintaining ratio
Common presets (16:9, 4:3, 1:1, 21:9)
Image and video resolution recommendations
Social media size presets
Why Use This Tool — Aspect Ratio Calculator
Free Online Aspect ratio calculatorImage ratio — for EveryoneFast & Easy Video aspect ratioScreen ratio calculator — 100% FreeFree Online Resize proportions
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Lightning Fast
Get instant results with zero wait time. No server delays, no loading screens.
Works Everywhere
Use on any device — desktop, tablet, or phone. No downloads or plugins needed.
Frequently Asked Questions — Aspect Ratio Calculator
What is an aspect ratio?
An aspect ratio is the proportional relationship between width and height of an image, video, or screen. It is expressed as two numbers separated by a colon, like 16:9 or 4:3. A 16:9 display is 16 units wide for every 9 units tall. Maintaining aspect ratio during resizing prevents distortion.
What is the standard aspect ratio for video?
The most common video aspect ratio is 16:9, which is the standard for HDTV, YouTube, and most modern displays. Other common ratios include 4:3 for classic TV, 21:9 for ultra-wide cinema, 9:16 for vertical mobile video, and 1:1 for square social media posts.
How do I resize an image without distortion?
To resize without distortion, you must maintain the original aspect ratio. Enter either a new width or new height and the calculator will compute the other dimension to keep the proportions identical. Changing both width and height independently will stretch or squash the image.