HeroTools / Productivity
Local · Private · Free

Aspect Ratio Calculator

Lock a ratio and solve the missing width or height, simplify any size with GCD, and scale with video, screen & social presets — live, on your device.

Aspect ratio
:
Dimensions (pixels) 16 : 9

Ratio locked — edit width or height and the other follows. Click the lock to free both and read off the ratio instead.

Calculated locally — nothing is sent anywhere.

Preview
16:9
Presets
Common ratios
Video & screen
Social & photo

Exact ratios, simplified automatically

Enter any width and height and the calculator reduces it to its simplest whole-number ratio using the greatest common divisor — so 1920×1080 reads as 16:9 and 2560×1600 as 16:10. Lock the ratio to resize without distortion, or unlock to discover the ratio of a size you already have. It runs entirely in your browser, free forever.

About Aspect Ratio Calculator

Aspect Ratio Calculator is a free, private productivity tool that runs entirely in your web browser. Solve width/height for any aspect ratio, with screen & video presets. Because everything happens locally on your device, your files and data are never uploaded to a server, there is no sign-up or installation required, and it keeps working offline. It is handy for aspect ratio, resolution, 16:9, dimensions. Like every HeroTool by Digital Heroes, Aspect Ratio Calculator is 100% free with no limits.

How to use Aspect Ratio Calculator

  1. Open Aspect Ratio Calculator — it runs entirely in your browser, with no signup.
  2. Fill in the fields or choose the options you want.
  3. Adjust the options to match exactly what you need.
  4. Copy or download your result — it is free, and your data stays on your device.

Frequently asked questions

Is Aspect Ratio Calculator free?

Yes — Aspect Ratio Calculator is completely free for everyone. No sign-up, no account and no usage limits.

Is it private? Are my files uploaded anywhere?

No. Aspect Ratio Calculator runs entirely in your browser on your own device, so your data never leaves your computer and nothing is uploaded to a server.

Does it work offline?

Yes. HeroTools is a Progressive Web App — once the page has loaded it keeps working offline, and you can install it as an app from your browser.

Do I need to install anything or create an account?

No. Just open the page and start using it. Installing it as an app is optional and only adds offline convenience.

What does Aspect Ratio Calculator do?

Solve width/height for any aspect ratio, with screen & video presets.

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