Aspect Ratio Calculator
Calculate aspect ratios from width and height with common presets available.
Enter Width/Height
Select a preset or enter a custom ratio
Enter either width or height, and the other will be calculated automatically
Calculation Result
What is Aspect Ratio Calculator?
An online tool that calculates the aspect ratio (width to height ratio) from the dimensions of images, videos, or design elements. It features two modes: calculating aspect ratios and automatically computing dimensions based on a specified ratio. Streamline your design and video editing workflows efficiently.
Key Features
Mode 1: Calculate Aspect Ratio
- Automatically calculate aspect ratio from width and height inputs
- Automatic ratio simplification using GCD (Greatest Common Divisor)
- Display decimal format aspect ratios simultaneously
- Clear visualization of calculation details (GCD, calculation steps)
Mode 2: Calculate Dimensions
- Select from common presets (16:9, 4:3, 1:1, etc.)
- Support for custom ratio inputs
- Enter either width or height, and the other dimension is automatically calculated
- Real-time dimension updates
Quick Start
To Calculate Aspect Ratio
- Select the "Calc Ratio" tab
- Enter width and height (e.g., 1920 × 1080)
- The aspect ratio is automatically calculated and displayed (16:9)
To Calculate Dimensions
- Select the "Calc Dimensions" tab
- Choose a ratio from presets (or enter a custom ratio)
- Enter either width or height
- The other dimension is automatically calculated
Use Cases
- Checking the aspect ratio of images or videos
- Determining layout ratios for designs
- Maintaining ratios across different resolutions
- Setting aspect ratios in video editing
- Finding dimensions that match a specific ratio
Calculation Formulas and Examples
Basic Formulas
Aspect Ratio = Width : Height (simplified by GCD)
Decimal Ratio = Width ÷ Height
Calculation Examples
- 1920 × 1080 → 16:9 (1.78)
- 1280 × 720 → 16:9 (1.78)
- 1024 × 768 → 4:3 (1.33)
- 1080 × 1080 → 1:1 (1.00)
Detailed Calculation Process
/* Calculation Example */
1920 × 1080
GCD(1920, 1080) = 120
1920 ÷ 120 = 16
1080 ÷ 120 = 9
Result: 16:9
Dimension Calculation Examples
/* For 16:9 ratio with width of 1920px */
Height = (1920 × 9) ÷ 16 = 1080px
/* For 16:9 ratio with height of 720px */
Width = (720 × 16) ÷ 9 = 1280px
Preset List
| Preset | Ratio | Usage |
|---|---|---|
| 16:9 | 1.78:1 | Full HD, 4K video, common displays |
| 4:3 | 1.33:1 | Standard screen, classic displays |
| 1:1 | 1:1 | Square, Instagram posts |
| 21:9 | 2.33:1 | Cinemascope, ultrawide monitors |
| 9:16 | 0.56:1 | Vertical video, smartphone video |
| 3:2 | 1.5:1 | DSLR camera, photo printing |
| 16:10 | 1.6:1 | WUXGA, laptop screens |
FAQ (Frequently Asked Questions)
Why simplify the aspect ratio?
16:9 is more intuitive and easier to understand than 1920:1080. Simplification using GCD clarifies the essential ratio.
What is the decimal format aspect ratio used for?
It's useful for the CSS aspect-ratio property and programming calculations. It also makes it easier to numerically compare ratio sizes.
How does automatic calculation work in "Calculate Dimensions" mode?
After selecting a preset or custom ratio, when you enter either width or height, the other value is automatically calculated while maintaining the selected ratio. For example, if you select 16:9 and enter 1920 for width, the height is automatically calculated as 1080px.
How do I use custom ratios?
In "Calculate Dimensions" mode, select the "Custom" button to input your own ratio (width ratio and height ratio). This supports special ratios like 5:4 or 21:10.