Aspect Ratio Calculator
Calculate dimensions based on aspect ratios, find missing widths or heights, and explore common presets like 16:9, 4:3, and 1:1.
Common Ratios & Presets
1. Set Base Dimensions
Enter your starting width and height, or select a preset above.
2. Calculate Target Dimensions
Enter a new width to calculate the height, or vice versa.
Formula: The calculator locks the aspect ratio so that W1 / H1 = W2 / H2. Changing a value in the Target Dimensions recalculates the adjacent field dynamically.
Aspect Ratio
How to use the Aspect Ratio Calculator?
Set Base Ratio
Enter your original width and height, or select a quick preset like 16:9 or 1:1.
Enter Target Dimension
Type in the new width or height you want your final image or video to be.
Get Result Instantly
The missing dimension is instantly calculated to perfectly match your target aspect ratio.
Frequently Asked Questions
1. What is an Aspect Ratio?
Aspect ratio refers to the proportional relationship between the width and height of an image or screen. It is usually written as two numbers separated by a colon, like 16:9 or 4:3.
2. Why do aspect ratios matter?
Using the correct aspect ratio ensures your images and videos look right on the platforms they are displayed. Incorrect ratios can lead to stretching, squishing, or unwanted black bars.
3. How does this calculator work?
It uses cross-multiplication. You enter the original width and height (or your target aspect ratio like 16 and 9) in the first block, and then when you enter a new width, it calculates the proper new height to maintain that exact proportion.
4. What is the standard aspect ratio for social media?
For Instagram feeds, 1:1 (square) or 4:5 (portrait) is best. For Instagram Reels, TikTok, and YouTube Shorts, use 9:16. For regular YouTube videos, 16:9 is the standard.