4:3 Aspect Ratio Calculator
4:3 is the classic screen and photo shape, a good deal squarer than widescreen. Type one side and the calculator works out the other.
Classic 4:3 resolutions
4:3 goes back to the earliest computer displays, and it is still the shape behind plenty of tablet screens and slide decks. The sizes it turns up in most:
| Name | Pixel size |
|---|---|
| XGA | 1024 × 768 px |
| UXGA | 1600 × 1200 px |
| QXGA | 2048 × 1536 px |
A 4:3 height is the width × 3 ÷ 4 — a 1024 px wide canvas is 768 px tall. To go from a height to a width, multiply by 4 and divide by 3 instead.
Ratio solver
Preset ratios
Ratio identifier
16:9 — widescreen video (YouTube, HD/4K)
Common sizes for this ratio
- HD (720p)1280 × 720
- Full HD (1080p)1920 × 1080
- QHD (1440p)2560 × 1440
- 4K UHD3840 × 2160
Everything runs locally in your browser. Nothing is uploaded to any server — close the tab and your files are gone.
Working in 4:3
The 4 : 3 preset is already on
The ratio fields start at 4 and 3, so the first number you type is being solved as 4:3 from the outset.
Fill in the side you know
Type a width into W2 or a height into H2, and the field next to it follows immediately at the same ratio.
Pull a standard size out of the list
XGA (1024 × 768), UXGA (1600 × 1200) and QXGA (2048 × 1536) sit below the calculator, each one click to copy.
Check what changes in widescreen
Tap the 16:9 chip to see how much height the same width loses — the fastest way to plan a crop before you open the file.
Frequently asked questions
What are the standard 4:3 resolutions?
1024 × 768 (XGA), 1600 × 1200 (UXGA) and 2048 × 1536 (QXGA) are the ones still in regular use, with 640 × 480 and 800 × 600 as the older members of the same family. Every one of them divides evenly: 1024 ÷ 4 = 256 and 768 ÷ 3 = 256, so the ratio is exact rather than approximate.
Do iPads have a 4:3 screen?
Tablet screens are often described as roughly 4:3, and several iPad models sit close to it, but the exact ratio differs from model to model — some are a little taller than others. Look up the pixel dimensions for the specific device and type them in; the ratio identifier will tell you what they simplify to.
Should a presentation be 4:3 or 16:9?
16:9 matches the shape of most current laptops, monitors and projectors, so it fills the screen without bars. 4:3 still earns its place with older projectors, printed handouts, and slides that are mostly text or tables, where the extra height fits more lines. Decide before you start — reflowing a finished deck from one to the other is the part that costs a day.
How much gets cropped converting 4:3 to 16:9?
If you keep the width, the 16:9 frame is only three-quarters as tall: 1024 × 768 becomes 1024 × 576, so 192 px — a quarter of the height — is cut away. If you keep the height instead, the frame has to get wider: 768 px tall at 16:9 works out to about 1365 px, roughly 341 px more than the original width.
How do I calculate a 4:3 width from a height?
Multiply the height by 4 and divide by 3. A 900 px tall canvas is 1200 px wide, and a 1080 px one is 1440 px. Heights that divide cleanly by 3 give a whole-number width; anything else has to be rounded to the nearest pixel.
Is 4:3 the same as 1.33:1?
4 ÷ 3 = 1.333…, so yes — 1.33:1 is the same shape written as a decimal, the way film formats tend to be quoted. The calculator shows the simplified whole-number form next to whatever you type, so a stray pixel size still tells you which standard ratio it is closest to.