Aspect Ratio Calculator – Calculate & Convert Aspect Ratios Free
Calculate and convert aspect ratios for video, images, and screens. Free online aspect ratio calculator.
Common presets
Original dimensions
Results
Aspect Ratio
16:9
Decimal Ratio
1.778
New height for 1280px width
720px
Visual preview
Frequently Asked Questions
Aspect ratio is the proportional relationship between width and height, expressed as W:H (e.g. 16:9). It describes the shape of an image or screen without specifying actual pixel dimensions.
Enter your original width and height, then enter the new width. The tool calculates the new height that maintains the same aspect ratio.
16:9 is standard widescreen (HD/4K video, most monitors). 4:3 is traditional TV/monitor. 1:1 is square (Instagram). 9:16 is vertical video (TikTok, Reels). 21:9 is ultrawide.
No. All calculations happen in your browser. Nothing is sent to any server.
What is Aspect Ratio Calculator?
An aspect ratio calculator computes the relationship between the width and height of an image, video, or screen. It helps you maintain proportions when resizing, find the correct dimensions for a specific aspect ratio, or convert between different ratios. Common aspect ratios include 16:9 (widescreen video), 4:3 (traditional TV), and 1:1 (square for Instagram).
How to Use Aspect Ratio Calculator
- 1Enter the width and height to calculate the aspect ratio.
- 2Or enter an aspect ratio and one dimension to calculate the other.
- 3Use common presets (16:9, 4:3, 1:1, 21:9) for quick calculations.
Key Features
- ✓Calculate aspect ratio from dimensions
- ✓Calculate dimensions from aspect ratio
- ✓Common presets (16:9, 4:3, 1:1, 21:9)
- ✓Instant calculation
Benefits
- →Maintain proportions when resizing images
- →Find correct dimensions for video formats
- →Design responsive layouts
Why Use Irreva for Aspect Ratio Calculator?
Frequently Asked Questions
What is aspect ratio?
Aspect ratio is the proportional relationship between width and height, expressed as W:H (e.g., 16:9 means for every 16 units of width, there are 9 units of height).
What is the standard aspect ratio for YouTube videos?
YouTube uses 16:9 (widescreen) as the standard aspect ratio.
What aspect ratio is 1920×1080?
1920×1080 is a 16:9 aspect ratio, the standard for Full HD (1080p) video.
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