- ConverterCrop or pad to a new ratio.
- ResolutionMegapixels, scale and print size.
- DPI to pixelInches times DPI equals pixels.
- BitrateBitrate, duration and file size.
- Pixel aspectPAR from stored size and DAR.
- Custom ratioDecimals to simplified ratios.
- Screen sizeDiagonal plus ratio to width.
- PPIPixels per inch from a panel.
- Image sizeWidth and height from a picture.
How the tools differ
The home calculator takes any ratio and one side, and returns the other side in pixels. It can also simplify two sides, or you can open the converter for a crop and a pad. A specialist page is for megapixels, print DPI, bitrate, pixel aspect, a cinema decimal, screen size, or PPI.
Start on the homepage when you know the shape and need a width or a height. Start there too when you already have both pixel sides and want them reduced. Open convert when the destination ratio is chosen and you need a crop or a pad. The other tools start from a different input: paper size, a diagonal, a bitrate, or a decimal such as 1.85.
Aspect ratio tools on this page each answer one question so the forms stay short. Use the homepage for the missing pixel side of a ratio, or to read a ratio from two sides. Use convert when the destination shape is already chosen. Use DPI when the job starts on paper, bitrate when you are guessing a file size, and the screen or PPI tools when the only number on the box is a diagonal. The pixel-aspect page is only for older broadcast files whose pixels are not square. The image size checker is the one that starts from a picture: it reads the pixel width and height, then the ratio. Opening the wrong form is what mixes print dots with screen density.
Frequently asked questions
Which tool should I open first?
Start on the homepage unless you already know you need bitrate, DPI, PAR or the pixel size of a picture.
Are image resizers here?
No. The image size checker reads width and height. It does not write a new file. Crop and pad sizes are on the converter.