Tan Phat Digital

Aspect Ratio Calculator Online Free

Calculate aspect ratios for images and videos

Calculate Ratio

16:9

Ratio

1.7778

Decimal

Scale Dimensions

Aspect Ratio Calculator Online Free - Calculate Image Ratios

Calculate aspect ratios for images and videos online free. Enter width and height to get the ratio as a fraction (e.g. 16:9) and decimal. Scale dimensions while maintaining the aspect ratio — enter a new width to calculate the proportional height, or vice versa. Perfect for responsive web design, video production, social media image sizing, and print design.

Key Features

Calculate ratio from width and height
Shows ratio as fraction (e.g. 16:9)
Shows ratio as decimal (e.g. 1.7778)
Scale width from height proportionally
Scale height from width proportionally
Instant calculation with no delay
Common ratio reference (16:9, 4:3, 1:1)
Clean two-panel layout
Free, no registration required

Why Calculate Aspect Ratios?

Aspect ratios are fundamental to visual design. Maintaining the correct ratio prevents distortion when scaling images or videos. Web developers need to know ratios for responsive images and video embeds. Video producers need to match platform requirements (YouTube is 16:9, Instagram Stories is 9:16). Photographers need to crop images to specific ratios for printing. Designers need to scale mockups proportionally without distortion.

Benefits

  • Resize images without distortion or stretching
  • Plan video dimensions for different platforms
  • Design responsive layouts with correct proportions
  • Calculate print dimensions for photos and posters
  • Verify image ratios before uploading to social media
  • Scale UI mockups proportionally in design tools

How to Calculate Aspect Ratio

  1. 1Enter the original width in the Width field
  2. 2Enter the original height in the Height field
  3. 3View the ratio (e.g. 16:9) and decimal instantly
  4. 4To scale: enter a new width and click '→ H'
  5. 5Or enter a new height and click '→ W'
  6. 6The proportional dimension is calculated automatically

Common Aspect Ratios Reference

16:9 (1.778) — HD/4K video, YouTube, most monitors. 4:3 (1.333) — traditional TV, iPad. 1:1 — Instagram square posts, profile pictures. 9:16 (0.5625) — Instagram/TikTok Stories, vertical video. 3:2 (1.5) — DSLR photos, 35mm film. 21:9 (2.333) — ultrawide monitors, cinematic video. 1.91:1 — Facebook/LinkedIn link previews. A4 paper: 1:1.414 (√2).

Frequently Asked Questions

What is 16:9?

16:9 is the standard widescreen aspect ratio used for HD and 4K video, most monitors, and YouTube. 1920×1080 and 3840×2160 are both 16:9.

What aspect ratio should I use for social media?

Instagram posts: 1:1 (square) or 4:5. Stories/Reels: 9:16. Twitter/X: 16:9. Facebook: 1.91:1.

How do I maintain aspect ratio when resizing?

Enter the new width and click '→ H' to calculate the proportional height, or enter the new height and click '→ W' for the width.

What is 4:3?

4:3 is the traditional TV and monitor aspect ratio. Common resolutions: 640×480, 800×600, 1024×768.

What is the aspect ratio of A4 paper?

A4 paper is 210×297mm, giving an aspect ratio of approximately 1:1.414 (√2). This is the ISO 216 standard used for most paper sizes.

Related Keywords

aspect ratio calculatorimage aspect ratiovideo aspect ratioratio calculator onlinescale dimensionsimage resize calculatorproportional scaling16:9 calculator

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