What is a 16:9 aspect ratio?

16:9 is the standard widescreen aspect ratio used for modern TVs, monitors, and online video platforms like YouTube. It means the display is 16 units wide for every 9 units tall.

How do I calculate height from width and aspect ratio?

To calculate height from width and a known ratio: Height = Width × (Ratio Height / Ratio Width). For example, at 16:9 with a width of 1920: Height = 1920 × (9 / 16) = 1080.

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💻 Tech & Computing

Aspect Ratio & Resolution Calculator

Lock an aspect ratio and calculate the missing dimension. Solve for width, height, or ratio for any screen or video.

⚡ Instant 🆓 Free 🔒 Private

Select a preset ratio or enter a custom ratio, then change either dimension to solve for the other.

Preset Ratios

Ratio W

Ratio H

Width (px)

Height (px)

Active Aspect Ratio

16 : 9

Total Megapixels —

Pixel Ratio (Diagonal) —

Understanding Aspect Ratios

An aspect ratio defines the proportional relationship between a display's width and height. The two numbers are expressed as W:H. For example, a 16:9 ratio means the display is 16 units wide for every 9 units tall. Aspect ratios are fundamental in video production, web design, photography, and UI/UX work.

Common Aspect Ratios

16:9 — Standard widescreen (YouTube, HDTV, most monitors)
4:3 — Classic TV and older monitor format
21:9 — Ultra-widescreen / cinematic
9:16 — Vertical / portrait (mobile, Reels, TikTok, Shorts)
1:1 — Square (Instagram posts)

The Reverse-Solver Formula

Given a locked ratio W:H, if you know the width you want, simply multiply: Height = Width × (H / W). This calculator uses this principle to let you freely change either dimension while the other updates automatically, preserving your exact ratio.