4:3 Aspect Ratio Calculator
Classic television, older iPads and retro gaming. Type either dimension to get the matching pair.
4:3 (1.33:1) was the television standard for half a century and still lives on iPad displays, CCTV sensors and retro games. 640×480, 1024×768 (XGA) and 1600×1200 (UXGA) are all 4:3. The math is forgiving — divide or multiply by 4/3 — but sizing a modern 16:9 layout for a 4:3 asset without cropping trips people constantly.
1920 × 1440
Exact ratio: 4:3 · CSS: aspect-ratio: 4 / 3 · padding-top fallback: 75.00%
Formula
height = width × 3 ÷ 4
width = height × 4 ÷ 3
// padding-top fallback: 75.00% — keeps layout stable before the image loads
aspect-ratio: 4 / 3 — modern replacement for the padding hack
All math runs locally in your browser. No upload. Type either side, the other solves live — and the URL updates so you can share an exact pair (?w=1920&rw=4&rh=3) or bookmark a preset.
Common 4:3 resolutions
| Width | Height | Use |
|---|---|---|
| 320px | 240px | |
| 640px | 480px | |
| 1280px | 960px | |
| 1920px | 1440px | |
| 2560px | 1920px | |
| 3840px | 2880px | 4K |
| 5120px | 3840px | |
| 7680px | 5760px |
Exact known sizes in this ratio
- 1024×768 — 1024×768 XGA (Classic 4:3, old iPad)
- 800×600 — 800×600 SVGA (Retro 4:3)
- 640×480 — 640×480 VGA (VGA, 4:3 retro)
- 1920×1440 — 1920×1440 QXGA (4:3 QXGA, high-res 4:3)
When to use 4:3
- iPad 9.7-inch / iPad mini displays
- CCTV and industrial cameras
- Retro 4:3 game art & emulators
- Fullscreen PowerPoint 4:3 legacy decks
Pitfalls to avoid
- Pillarboxing on widescreen TVs
- Mistaking 4:3 for 3:4 — one is landscape, the other portrait
- Exporting slides at 1024×768 then stretching to 16:9
CSS snippet
Modern:
.frame { aspect-ratio: 4 / 3; width: 100%; overflow: hidden; }
.frame > img { width: 100%; height: 100%; object-fit: cover; }Legacy padding hack (for very old browsers):
.wrap { position: relative; width: 100%; padding-top: 75.00%; }
.wrap > * { position: absolute; inset: 0; }Pair with object-fit: contain to letterbox without cropping, or cover to fill and crop safely.
Platform reference
Frequently asked
What is 4:3 in pixels?
Common sizes: 640×480, 800×600, 1024×768, 1152×864, 1600×1200. Any width that is 4/3 of the height works.
Is iPad still 4:3?
The classic 9.7-inch iPad and iPad mini are 4:3 (1024×768 or 2048×1536). Newer iPad Pro 11″ is closer to 1.43:1 — check the exact panel.
How to letterbox 4:3 inside 16:9?
Center the 4:3 frame and fill side pillars, or use object-fit: contain with a 16:9 placeholder so nothing stretches.
Tip: add ?w=1920 or ?h=1080 to this URL to prefill the calculator — useful for linking from a spec doc.
Other ratios
- 16:9 Aspect Ratio Calculator
- 1:1 Square Calculator
- 9:16 Vertical Calculator
- 21:9 Ultrawide Calculator
- 3:2 Aspect Ratio Calculator
- 16:10 Aspect Ratio Calculator
- 4:5 Portrait Calculator
- 2:1 Aspect Ratio Calculator
Look up by resolution
- 1920×1080 — 1920×1080 Full HD
- 1280×720 — 1280×720 HD
- 3840×2160 — 3840×2160 4K UHD
- 2560×1440 — 2560×1440 QHD
- 1366×768 — 1366×768 WXGA
- 3440×1440 — 3440×1440 UW-QHD
What aspect ratio is 1920×1080? → · Full FAQ →