Calculators
Aspect Ratio Calculator
Enter one dimension and an aspect ratio to get the matching width or height. Presets for common video and photo ratios help with image resizing math.
Runs entirely in your browser. Your data never leaves this device.
- 16:9 4:3 1:1 presets
- Custom ratio
- Solve W or H
- Decimal precision
- Pairs with Image Resizer
Workspace
Client-side · No upload
How it works
- Choose a preset or enter a custom ratio.
- Provide width or height.
- Read the matching dimension.
Key features
- 16:9 4:3 1:1 presets
- Custom ratio
- Solve W or H
- Decimal precision
- Pairs with Image Resizer
FAQ
Rounding?
Heights/widths round to whole pixels by default.
Portrait?
Swap or use ratios like 9:16 for vertical video.
Private?
Yes.
Related?
Use Image Resizer to apply the dimensions to a file.
Keep building
Related developer tools
Images
Free Image Resizer online
Resize images by pixels, percentage, or common presets. Client-side only.
Calculators
Free Percentage Calculator online
Calculate percentages, increases, decreases, and “X is what % of Y” instantly.
Design
Free CSS Unit Converter online
Convert px, rem, em, and % CSS units with a configurable root font size.