How to use the 2:1 Aspect Ratio calculator
Choose a mode
Resize by Aspect Ratio keeps 2:1. Calculate Aspect Ratio reads the ratio from two pixel sides.
Enter the numbers
The form opens at 2:1. Change the width or the height, or type both pixel sides.
Read the result
A width of 1920 is 960 tall at 2:1.
Summarize with
| Size | MP | Name | |
|---|---|---|---|
| 1920×960 | 1.8432 | 1920×960 | |
| 1280×640 | 0.8192 | 1280×640 | |
| 3840×1920 | 7.3728 | 3840×1920 | |
| 2560×1280 | 3.2768 | 2560×1280 | |
| 1366×683 | 0.933 | 1366×683 | |
| 1600×800 | 1.28 | 1600×800 | |
| 1440×720 | 1.0368 | 1440×720 | |
| 1920×960 | 1.8432 | 1920×960 |
Univisium on set, 18:9 on a spec sheet
2:1 (18:9) showed up on tall phones and as Univisium in some cinema experiments. It is wider than 16:9 and narrower than 21:9 marketing.
These are one rectangle with two audiences. A cinematographer saying Univisium and a 2017 phone ad saying 18:9 both mean the 2:1 aspect ratio. They do not mean 19.5:9, 20:9 or 21:9. If the sheet prints a decimal other than 2, use the custom calculator.
Univisium 2:1 was proposed as a common production container so films would not live as 1.85 in one country and 2.39 in another. It did not replace those theatrical ratios; it remains a useful intermediate.
Phone marketing that said “18:9” meant a taller 16:9-class handset, not cinema. Many later phones drifted to 19.5:9 or 20:9. Type the exact decimal on the custom calculator if your spec sheet is not 2:1.
Storaro’s common container
Vittorio Storaro proposed Univisium 2:1 as a common production ratio. Phone makers later used 18:9 / 2:1 to advertise “taller” 16:9-class devices.
A mild crop from HD, not a phone-video job
From 1920×1080, a 2:1 trim is 1920×960 and a padded canvas is 2160×1080. That is a small side cut or a short letterbox, gentler than a 9:16 social crop and a different decision from an ultrawide monitor.
From 1920×1080, 2:1 is a mild side crop or a small pad. It is a gentler convert than 9:16 and a different decision than 21:9 marketing.
2:1 is 18:9 exactly. It is not 19.5:9 (13:6) and not 21:9. Use the custom tool if your panel is 19.5:9.
Frequently asked questions
Is 18:9 the same as 2:1?
Yes. 18÷9 = 2. Phone ads that said 18:9 were naming this 2:1 aspect ratio, not a cinema release format, even though Univisium uses the same fraction.
My phone says 19.5:9. Is that here?
No. 19.5:9 is a different decimal. Type it on the custom calculator. This page stays on exact 2:1.
How close is 2:1 to 16:9?
From 1920×1080 the trim is only down to 1920×960. You lose a little off the sides, or you pad to 2160×1080. It is not the drastic cut that vertical video demands.
Did Univisium replace 1.85 and 2.39?
No. It was proposed as a shared container and did not displace those theatrical ratios. It remains a useful in-between.