Calculate missing image or video dimensions, resize while keeping the same ratio, or convert formats such as 4:3 to 16:9 with fit and crop dimensions.
16:9 ratio based on 1920 px width
Keeps the full image and may add empty space.
Fills the target ratio and crops overflow.
ToolWisp Aspect Ratio Calculator helps you calculate a missing width or height while preserving a chosen ratio. It is useful for images, video, presentations, thumbnails, social media graphics, displays, game assets, and web layouts.
Choose a common ratio such as 16:9, 4:3, 1:1, 9:16, 4:5, or 21:9, then enter a width or height to calculate the matching dimension.
Converting from 4:3 to 16:9 can mean two different things: fitting the entire 4:3 image inside a wider 16:9 frame, or filling a 16:9 frame and cropping part of the original image. The Convert Ratio mode shows both options.
For example, a 1600 × 1200 image has a 4:3 ratio. A 16:9 frame using the same 1600 px width is 1600 × 900. If you instead keep the full 1200 px height, a 16:9 frame is approximately 2133 × 1200.
| Aspect Ratio | Example Resolution | Common Use |
|---|---|---|
| 16:9 | 1920 × 1080 | HD video, monitors, YouTube |
| 4:3 | 1600 × 1200 | Classic displays, older photos |
| 1:1 | 1080 × 1080 | Square images and social posts |
| 9:16 | 1080 × 1920 | Vertical video, Stories, Shorts |
| 4:5 | 1080 × 1350 | Portrait social media posts |
| 21:9 | 2560 × 1080 | Ultrawide displays and cinema-style layouts |
Enter a width or height and instantly calculate the matching dimension.
Compare fit and crop dimensions when changing between common formats.
Quickly choose 16:9, 4:3, 1:1, 9:16, 4:5, 21:9 and more.
Enter any positive width-to-height ratio for custom screens, images, or layouts.
Try more ToolWisp tools for images, dimensions, random values, and everyday calculations.
Open Convert Ratio mode, choose 4:3 as the source and 16:9 as the target, then enter the source dimensions. ToolWisp shows dimensions for fitting inside the original frame and for filling the target ratio with cropping.
A width of 1920 pixels at a 16:9 aspect ratio corresponds to a height of 1080 pixels, giving a 1920 × 1080 resolution.
A width of 1280 pixels at 16:9 corresponds to 720 pixels high, giving 1280 × 720.
Choose your aspect ratio, select Height → calculate width, enter the height, and ToolWisp calculates the matching width.
Yes. Enter any positive values in the two aspect-ratio fields, such as 3:2, 5:4, 2.39:1, or a custom screen ratio.
Fit keeps the entire source visible inside the target ratio, which may leave unused space. Fill or crop makes the target frame completely full, which requires removing some content from the edges.