Aspect Ratio Calculator

Free online aspect ratio converter. Calculate image ratio from pixels, convert screen ratios, and find dimensions using our aspect ratio formula.

Aspect Ratio Calculator

Convert screen ratios and calculate image dimensions instantly

Aspect Ratio

16:9

1.7778:1

Width

1920px

Height

1080px

Ratio Visualizer

16:9

1920 × 1080 px

1.778:1

Width
Height
16:9 Reference
Current Ratio

How to Calculate Aspect Ratio

1

Choose Your Mode

Select Find Ratio to discover the aspect ratio from pixel dimensions, or New Dimension to calculate missing width/height.

2

Enter Dimensions

Input your width and height in pixels, or use quick presets like 16:9, 21:9, or 9:16 for common screen ratios.

3

Get Instant Results

View your aspect ratio, decimal value, and visual preview. Add screen diagonal for physical size calculations.

Common Screen Ratios & Image Ratios Chart

Complete aspect ratios reference table with formulas. Find the right screen ratio for your display, video project, or image dimensions.

Ratio Decimal Formula Common Use
16:9 1.778 Width = Height × 1.778 Standard widescreen TVs, monitors, YouTube videos
21:9 2.333 Width = Height × 2.333 Ultrawide monitors, cinematic films
4:3 1.333 Width = Height × 1.333 Classic TVs, iPad, presentations
1:1 1.000 Width = Height Instagram posts, profile pictures
9:16 0.563 Width = Height × 0.563 TikTok, Instagram Reels, mobile video
3:2 1.500 Width = Height × 1.5 DSLR photos, MacBook displays
16:10 1.600 Width = Height × 1.6 MacBooks, some monitors, tablets
2.39:1 2.390 Width = Height × 2.39 Anamorphic widescreen cinema

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When to Use This Aspect Ratio Converter

Video Aspect Ratio

Use our aspect ratio formula to calculate dimensions for YouTube (16:9), TikTok (9:16), or cinema (2.39:1) video formats.

Learn more about video ratios

Image Ratio Calculator

Calculate image ratio and maintain proportions when resizing photos. Enter width or height to find the other dimension automatically.

Complete aspect ratio guide

Screen Ratio Comparison

Compare screen ratios for monitors and TVs. Convert between 21:9 ultrawide and standard 16:9 display aspect ratios.

Monitor size calculator

Aspect Ratio FAQ: Formulas & Conversions

What is aspect ratio?
Aspect ratio is the proportional relationship between width and height of a screen or image. It's expressed as two numbers separated by a colon (e.g., 16:9). Common ratios include 16:9 (widescreen), 21:9 (ultrawide), 4:3 (standard), and 1:1 (square).
How do I calculate aspect ratio from width and height?
Divide the width by the height, then find the greatest common divisor (GCD) to simplify. For example, 1920÷1080 = 1.777... The GCD of 1920 and 1080 is 120, so 1920/120 : 1080/120 = 16:9.
What is the most common aspect ratio for videos?
16:9 is the most common aspect ratio for modern video content, used by YouTube, Netflix, and most streaming platforms. For vertical mobile video (TikTok, Reels), 9:16 is standard.
What aspect ratio is 1920x1080?
1920×1080 pixels (Full HD or 1080p) has an aspect ratio of 16:9. This is the most widely used resolution for monitors, TVs, and video content.
How do I convert aspect ratio to pixels?
Multiply the aspect ratio values by a common factor. For 16:9 at 1080p height: width = (16/9) × 1080 = 1920. For any target dimension, use our calculator's 'New Dimension' mode.
What is the difference between 16:9 and 16:10?
16:9 (1.778:1) is wider and more common for video content. 16:10 (1.6:1) is slightly taller, preferred for productivity as it shows more vertical content. MacBooks use 16:10.
What is the aspect ratio formula?
The aspect ratio formula is: Aspect Ratio = Width ÷ Height. To calculate dimensions: Width = Height × Ratio, or Height = Width ÷ Ratio. For example, for 16:9 with height 1080: Width = 1080 × (16÷9) = 1080 × 1.778 = 1920 pixels.
What aspect ratio is best for Instagram and TikTok?
Instagram feed posts use 1:1 (square) or 4:5 (portrait). Instagram Stories and Reels use 9:16 (1080×1920). TikTok videos use 9:16 vertical format. For Instagram carousels, 1:1 at 1080×1080 pixels works best.