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
16:9
100% Private
No Upload
Instant
Related Free Tools
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
Use Cases
Why Use Irreva for Aspect Ratio Calculator?
Maintain proportions when resizing images
Find correct dimensions for video formats
Design responsive layouts
Runs 100% in your browser — files never leave your device.
No account, no sign-up, no subscription — free forever.
Works on any device: desktop, tablet, or mobile.