Aspect Ratio Calculator
Calculate, scale, and visualize aspect ratios for images and video. Runs entirely in your browser.
Calculate Ratio from Dimensions
Ratio:
Decimal:
Simplified:
Scale to New Size (keep ratio)
Width: px
Height: px
Fill either New Width or New Height — the other will be calculated.
Visual Preview
16:9
Common Ratios
How to Use the Aspect Ratio Calculator
- Enter a width and height and click Calculate to see the simplified ratio and decimal.
- In the Scale section, enter a ratio and either width or height to find the missing dimension.
- Click any Common Ratio card to load it into the scale tool and preview it instantly.
- The visual preview box shows the proportions of the current ratio graphically.
Specifications
- Accepts
- No file needed
- Gives you
- On-screen result
- Where it runs
- Your browser — the file is never uploaded
- Sign-up
- None
- Cost
- Free, with no usage limits