Aspect Ratio Calculator
Resize width and height while keeping the same aspect ratio. Useful for images, video frames, displays, and design layouts.
Quickly calculate dimensions from common ratios like 16:9, 4:3, 3:2, 1:1, and custom ratios without manual math.
Aspect Ratio Calculator
Calculation Results
Enter a value and click Calculate
Quick Examples
What Is Aspect Ratio?
Aspect ratio describes the proportional relationship between width and height. It is written as two numbers, such as 16:9 or 4:3, and it stays the same no matter how large or small the image or screen becomes.
Formula Summary
- Aspect ratio: width : height
- Decimal ratio: width / height
- Height from width: width x (height part / width part)
- Width from height: height x (width part / height part)
- Area: width x height
- Diagonal: sqrt(width2 + height2)
Common Aspect Ratios
| Ratio | Decimal | Common Use | Example |
|---|---|---|---|
| 16:9 | 1.7778 | Widescreen video | 1920 x 1080 |
| 4:3 | 1.3333 | Classic displays | 1024 x 768 |
| 3:2 | 1.5000 | Photography | 3000 x 2000 |
| 1:1 | 1.0000 | Square posts | 1080 x 1080 |
| 21:9 | 2.3333 | Ultrawide screens | 2560 x 1080 |
| 16:10 | 1.6000 | Laptops | 1920 x 1200 |
| 9:16 | 0.5625 | Vertical video | 1080 x 1920 |
| 5:4 | 1.2500 | Legacy monitors | 1280 x 1024 |
| 2:1 | 2.0000 | Panorama | 2000 x 1000 |
| 18:9 | 2.0000 | Mobile screens | 2160 x 1080 |
| 14:9 | 1.5556 | Broadcast compromise | 1400 x 900 |
| 17:9 | 1.8889 | Cinema | 2048 x 1080 |
| 8:5 | 1.6000 | Tablet layout | 1600 x 1000 |
| 12:5 | 2.4000 | Ultra panorama | 2400 x 1000 |
| 11:8 | 1.3750 | Custom print | 1100 x 800 |
| 7:5 | 1.4000 | Photo print | 1400 x 1000 |
| 10:16 | 0.6250 | Portrait crop | 1000 x 1600 |
| 19:10 | 1.9000 | Large displays | 1900 x 1000 |
| 15:10 | 1.5000 | Presentation slide | 1500 x 1000 |
| 13:7 | 1.8571 | Wide layout | 1300 x 700 |
| 6:5 | 1.2000 | Portrait format | 1200 x 1000 |
| 11:9 | 1.2222 | Square-ish layout | 1222 x 1000 |
| 20:11 | 1.8182 | Digital signage | 2000 x 1100 |
| 24:10 | 2.4000 | Cinema widescreen | 2400 x 1000 |
| 3:1 | 3.0000 | Banner | 3000 x 1000 |
| 4:1 | 4.0000 | Super banner | 4000 x 1000 |
| 3:4 | 0.7500 | Portrait image | 900 x 1200 |
| 5:7 | 0.7143 | Poster frame | 1000 x 1400 |
| 8:7 | 1.1429 | Near-square crop | 800 x 700 |
| 7:8 | 0.8750 | Tall crop | 700 x 800 |
The calculator is especially helpful when you need to fit content into a fixed frame without stretching or distortion. Keep the ratio the same and scale only one dimension.
FAQ
What is the easiest way to keep an image ratio?
Lock the ratio, change only width or height, and let the calculator solve the other dimension.
Can I use pixels and physical units?
Yes, as long as both dimensions use the same unit. The ratio math works the same either way.
Why does the decimal ratio matter?
It lets you compare ratios quickly and is useful in design tools, coding, and display planning.
Does this change the original ratio?
No. It keeps the ratio fixed and only resizes the dimensions you enter.