What is 9:16 in pixels at 4K?
2160 × 3840 px
A 9:16 frame delivered at 4K is 2160 × 3840 pixels, 1.78 times as tall as it is wide. Reels, Shorts, TikTok, Stories — full-screen vertical.
How that is worked out
height = width ÷ (ratio width ÷ ratio height)
2160 ÷ 0.5625 = 3840
Worth knowing
- Both numbers are even and the shape is exactly 9:16, so nothing is given up to satisfy the 4:2:0 requirement that dimensions divide by two.
- That is 8.29 MP per frame — the same pixel count as a full 4K 3840 × 2160 frame, just arranged in a different shape.
- Dropped into a 3840 × 2160 timeline it fits at 1216 × 2160, leaving bars of 1312 px left and right.
- Where you see it: Reels, Shorts, TikTok, Stories — full-screen vertical.
9:16 at every delivery size
| Delivery | Pixels | Per frame |
|---|---|---|
| 480p | 480 × 854 | 0.41 MP |
| 720p | 720 × 1280 | 0.92 MP |
| 1080p | 1080 × 1920 | 2.07 MP |
| 1440p | 1440 × 2560 | 3.69 MP |
| 4K — this page | 2160 × 3840 | 8.29 MP |
Every value is rounded to an even number of pixels: H.264 and H.265 subsample colour in 2 × 2 blocks and reject odd dimensions.
Ratios either side of 9:16 at 4K
| Ratio | Pixels | Decimal | Bars inside 3840 × 2160 |
|---|---|---|---|
| 9:16 — this page | 2160 × 3840 | 0.56:1 | 1312 px left and right |
| 4:5 | 2160 × 2700 | 0.80:1 | 1056 px left and right |
| 1:1 | 2160 × 2160 | 1.00:1 | 840 px left and right |
| 5:4 | 2700 × 2160 | 1.25:1 | 570 px left and right |
| 4:3 | 2880 × 2160 | 1.33:1 | 480 px left and right |
| 3:2 | 3240 × 2160 | 1.50:1 | 300 px left and right |
| 16:9 | 3840 × 2160 | 1.78:1 | none — exact fit |
Need it for other values?
Scale width and height to 16:9, 9:16, 4:5, 2.39:1 or a custom ratio, with pixel dimensions at 1080p and 4K.