Size and ratio

16:9, 2.39:1 or 1.85 sets the width for the current height.

Aspect ratio
16:9
As a number
1.778:1
Common use
HD and 4K video, YouTube

Resize to the same ratio

Most video codecs need even widths and heights.

New height
720
New size
1280 × 720
Standard sizes at this ratio
360p640 × 360
480p854 × 480
540p960 × 540
720p1280 × 720
1080p1920 × 1080
1440p2560 × 1440
2160p3840 × 2160
4320p7680 × 4320

Fit it into another frame

Put the picture into a different frame: keep all of it with black bars, or fill the frame and crop the edges.

Fit: keep everything, add bars

Picture
1920 × 1080
Bars
none
Scale
100.0%

Fill: no bars, crop the edges

Scaled to
1920 × 1080
Cropped
nothing
Picture lost
0.0%
Scale
100.0%

Scale is the value to type into Scale in Premiere Pro’s Effect Controls, Final Cut Pro’s Transform or DaVinci Resolve’s Zoom, relative to the clip at 100%. Sizes are in pixels and rounded to whole pixels.