Live Dimension & Ratio Scaler

Aspect Ratio Calculator

Q: What is the standard aspect ratio for YouTube and modern TV?

16:9 (Widescreen) is the international standard for high-definition television, YouTube videos, computer monitors, and streaming platforms. Common resolutions include 1920×1080 (1080p FHD) and 3840×2160 (4K UHD).

Q: What aspect ratio should I use for Instagram Reels and TikTok?

Mobile-first vertical video uses 9:16 (Vertical Widescreen) . The recommended full-screen resolution is 1080×1920 pixels.

Q: How does the CSS aspect-ratio property work?

The modern CSS property aspect-ratio: 16 / 9; instructs the browser to maintain the ratio automatically, preventing cumulative layout shifts (CLS) when images and video embeds load dynamically.

Q: What are the standard aspect ratios for photo prints (4x6, 5x7, 8x10)?

Common photo prints use standard proportional ratios: a 4×6 photo uses 3:2 (1800×1200 px at 300 DPI), a 5×7 print uses 7:5 (2100×1500 px), and an 8×10 portrait uses 5:4 (3000×2400 px). Use the Photo & Print presets to scale dimensions without cropping.

Calculate pixel dimensions, simplify aspect ratios, and resize images or video without distortion. Real-time visual canvas scaling with 1-click CSS export.

Aspect Ratio

16:9

1.78:1 (Widescreen)

Total Resolution

1920 × 1080

2,073,600 Pixels

Megapixels

2.07 MP

Full HD (1080p)

Common Divisor

GCD: 120

Exact Pixel Factor

Enter Dimensions or Target Ratio

Width (px) W

Height (px) H

Popular Standard Ratios

Social Media & Video Presets

Photo & Print Presets (300 DPI Standard)

CSS Code Snippet


              aspect-ratio: 16 / 9;

Live Visual Scaling Box

16:9

1920 × 1080 16:9 Aspect Ratio

Scaled Resolutions

Scaled from current ratio

Scale	Resolution	Action

Proportional Pixel Resizer (Target Scaling)

Lock Aspect Ratio

Enter any target width or height below to compute exact proportional dimensions in pixels without distorting your image.

Target Width (px)

Target Height (px)

Print & Photo Sizes (300 DPI vs. 150 DPI)

Standard Paper & Frames

Required pixel resolutions for crisp, professional physical prints at 300 DPI (gallery quality) versus 150 DPI (newspaper/draft quality):

Print Size	Ratio	300 DPI (High-Res)	150 DPI (Draft)
4" × 6" (Photo)	2:3	1200 × 1800 px	600 × 900 px
5" × 7" (Greeting)	5:7	1500 × 2100 px	750 × 1050 px
8" × 10" (Portrait)	4:5	2400 × 3000 px	1200 × 1500 px
11" × 14" (Wall Frame)	11:14	3300 × 4200 px	1650 × 2100 px
A4 (ISO Standard)	1:1.414	2480 × 3508 px	1240 × 1754 px

How Aspect Ratio is Calculated

Aspect ratio is the proportional relationship between an image or display’s width and height. To calculate the simplified aspect ratio between a resolution like 1920×1080:

1. Find the Greatest Common Divisor (GCD) of width (1920) and height (1080) → GCD = 120

2. Divide Width by GCD: 1920 ÷ 120 = 16

3. Divide Height by GCD: 1080 ÷ 120 = 9

⇒ Resulting Aspect Ratio = 16:9

Frequently Asked Questions

What is the standard aspect ratio for YouTube and modern TV? ▼

16:9 (Widescreen) is the international standard for high-definition television, YouTube videos, computer monitors, and streaming platforms. Common resolutions include 1920×1080 (1080p FHD) and 3840×2160 (4K UHD).

What aspect ratio should I use for Instagram Reels and TikTok? ▼

Mobile-first vertical video uses 9:16 (Vertical Widescreen). The recommended full-screen resolution is 1080×1920 pixels.

How does the CSS aspect-ratio property work? ▼

The modern CSS property aspect-ratio: 16 / 9; instructs the browser to maintain the ratio automatically, preventing cumulative layout shifts (CLS) when images and video embeds load dynamically.

What are the standard aspect ratios for photo prints (4x6, 5x7, 8x10)? ▼

Common photo prints use standard proportional ratios: a 4×6 photo uses 3:2 (1800×1200 px at 300 DPI), a 5×7 print uses 7:5 (2100×1500 px), and an 8×10 portrait uses 5:4 (3000×2400 px). Use the Photo & Print presets to scale dimensions without cropping.