Question 1

What is an aspect ratio?

Accepted Answer

It is the proportional relationship between width and height. 16:9 means 16 horizontal units for every 9 vertical, the standard for YouTube and TVs.

Question 2

How do I keep the ratio when resizing?

Accepted Answer

Lock one dimension and the calculator solves for the other. We always preserve the original aspect ratio so output stays distortion-free.

Question 3

What ratio should I use for TikTok or Reels?

Accepted Answer

9:16 vertical. TikTok and Instagram Reels both use 1080×1920 as the recommended resolution.

Question 4

What about YouTube Shorts?

Accepted Answer

Same as TikTok — 9:16, 1080×1920. Long-form YouTube uses 16:9 (1920×1080 or 3840×2160 for 4K).

Question 5

Can I calculate a 4K equivalent of an HD ratio?

Accepted Answer

Yes. Pick the ratio, enter the source resolution, and the calculator scales it up cleanly to 4K (or any target multiplier).

Question 6

Does it handle anamorphic ratios like 2.39:1?

Accepted Answer

Yes. We support cinematic ratios including 2.35:1, 2.39:1, 1.85:1, 1.66:1, and the 4:3 broadcast standard.

Question 7

What's the difference between aspect ratio and resolution?

Accepted Answer

Aspect ratio describes shape; resolution is the actual pixel count. Two videos can share a ratio (16:9) but differ in resolution (720p vs 4K).

Question 8

Can I save my custom presets?

Accepted Answer

Anonymous use is ephemeral. Sign in to save up to 25 custom presets to your brand kit.

Aspect Ratio Calculator