Aspect Ratio Calculator
Aspect Ratio Calculator
Enter a width and height to find the simplified aspect ratio (like 16:9), and optionally calculate a new proportional width or height for resizing images or video.
Simplifying works exactly like the Ratio Simplifier — dividing both dimensions by their greatest common divisor — which is how a 1920×1080 video resolution reduces down to the familiar 16:9 widescreen ratio. Once you know the ratio, resizing while keeping it intact is a simple proportional calculation: a new height equals the target width multiplied by the original height-to-width ratio, which is exactly the math that prevents an image from looking stretched or squished when it's scaled to a new size for a different display or print format.
- Simplified ratio: found the same way as the Ratio Simplifier, by dividing both dimensions by their greatest common divisor.
- Example: 1920×1080 simplifies to 16:9 — the standard widescreen ratio.
- Resizing: to keep an image proportional, a new height = target width × (original height ÷ original width), and vice versa.
Why does my resized image look stretched if I don't use this?
If width and height aren't scaled by the exact same factor, the image distorts — this calculator ensures the new dimension keeps the original proportions.
What are common aspect ratios?
16:9 (widescreen video), 4:3 (older TVs/monitors), 1:1 (square, social media), and 21:9 (ultrawide) are among the most common.
Aspect Ratio Calculator
Enter a width and height to find the simplified aspect ratio (like 16:9), and optionally calculate a new proportional width or height for resizing images or video.
Simplifying works exactly like the Ratio Simplifier — dividing both dimensions by their greatest common divisor — which is how a 1920×1080 video resolution reduces down to the familiar 16:9 widescreen ratio. Once you know the ratio, resizing while keeping it intact is a simple proportional calculation: a new height equals the target width multiplied by the original height-to-width ratio, which is exactly the math that prevents an image from looking stretched or squished when it's scaled to a new size for a different display or print format.
- Simplified ratio: found the same way as the Ratio Simplifier, by dividing both dimensions by their greatest common divisor.
- Example: 1920×1080 simplifies to 16:9 — the standard widescreen ratio.
- Resizing: to keep an image proportional, a new height = target width × (original height ÷ original width), and vice versa.
Why does my resized image look stretched if I don't use this?
If width and height aren't scaled by the exact same factor, the image distorts — this calculator ensures the new dimension keeps the original proportions.
What are common aspect ratios?
16:9 (widescreen video), 4:3 (older TVs/monitors), 1:1 (square, social media), and 21:9 (ultrawide) are among the most common.