Find your
perfect proportion.
A simpler way to calculate aspect ratios and resize dimensions. Keep the shape. Skip the guesswork.
NOT ACTUAL PIXEL SIZE
Start with your dimensions.
Scale: 66.6667% · Exact whole-pixel dimensions
No image upload required. Only dimensions are used, and all calculations stay in this tab.
PIXELS IN. PROPORTIONS OUT.
NO ACCOUNT. NO TRACKING.
Change the size.
Keep the relationship.
An aspect ratio describes how width relates to height. A 1920 × 1080 image and a 1280 × 720 image both reduce to 16:9. Their dimensions differ; their shape does not.
Ratiolet reduces the original whole-pixel dimensions by their greatest common divisor. To calculate a missing dimension, it applies the same scale factor to both sides.
| Ratio | Example size | Shape |
|---|---|---|
| 16:9 | 1920 × 1080 | Widescreen |
| 1:1 | 1200 × 1200 | Square |
| 9:16 | 1080 × 1920 | Vertical |
| 4:3 | 1600 × 1200 | Classic |
| 3:2 | 1200 × 800 | Photo |
The right frame gives
your content room to breathe.
Questions, in proportion.
Does this tool resize image files?
No. Ratiolet calculates dimensions; it does not open, upload or modify your images. Use the resulting dimensions in your image editor or layout software.
What if the missing dimension is not a whole number?
The tool displays up to four decimal places and also gives the nearest whole-pixel size. Rounding may slightly change the ratio. Choose dimensions that divide evenly when exact proportions matter.
Can I enter any size?
Original and target dimensions must be whole pixels from 1 to 10,000,000. The calculated missing dimension can be fractional. Very wide or tall previews are schematic and visually bounded so their labels stay usable.
Are my calculations saved?
No. There are no network requests, cookies, analytics or saved histories in the tool. Copy the dimensions before you close the tab.