Aspect Ratio Calculator
Calculate a simplified aspect ratio and scale dimensions to a new width or height while keeping proportions.
Simplified ratio: 16:9
Scale to a new size — fill in just one
800 × 450
Free to use, no sign-up, no limit on how many times you run it.More creator tools
Overview
Useful for figuring out crop dimensions, resizing an image without distorting it, or checking what ratio a given resolution simplifies to.
- Common aspect ratio presets for video and social media
- Simplified ratio shown automatically
- Scale to a new width or height while preserving proportions
How to use it
- 1Enter the original width and height, or pick a preset
- 2Enter a new width or height (just one)
- 3Read the proportionally scaled result
Frequently asked questions
How does the scaling calculation work?
Enter your original dimensions, then fill in just one of the new width or height fields — the other is calculated automatically to preserve the exact same proportions.
What are the preset ratios for?
They're common video and image ratios (16:9, 1:1, 9:16, and others) that instantly fill in the original width and height fields so you can scale from a standard starting point.