Display Calculators
Ultrawide vs dual monitors.
Enter one ultrawide and the monitor you would use twice to compare panel width, height and screen area, with an allowance for the gap between the two panels. Panel dimensions only; check the full frame and stand width for your desk. Runs in your browser; nothing is sent or stored.
Inputs
Result
Fill the form and press Calculate.
Worked example
A 34 inch 21:9 ultrawide is 31.3 in x 13.4 in (419 sq in). Two 27 inch 16:9 monitors are 23.53 in wide each, so with a 20 mm (0.79 in) gap the pair is 2 x 23.53 + 0.79 = 47.9 in wide, 13.2 in tall and 623 sq in of screen, which is 1.49x the ultrawide area. The pair is 16.6 in wider.
How it works
Each panel is sized with width = diagonal x a / sqrt(a^2 + b^2). The dual width is two panel widths plus the gap you enter. Nominal ratios are used: the Ultrawide formats - Wikipedia article explains that 21:9 is a marketing term and real ultrawide panels are commonly 64:27 or 43:18, so pick 43:18 for a 3440 x 1440 monitor.
The comparison covers geometry only. It does not judge image quality, resolution or price, and it excludes bezels and stands beyond the gap you enter.
Sources: Ultrawide formats - Wikipedia. Each opened 2026-10-08.
Planning guide only, not professional advice. Figures are estimates from the inputs you enter.
FAQ
Is a 34 inch ultrawide as wide as two 27 inch monitors?
No. At 21:9 the 34 inch panel is 31.3 in wide, while two 27 inch 16:9 panels are about 47.9 in wide with a 20 mm gap.
Which has more screen area?
In the default example the two 27 inch panels have 623 sq in against 419 sq in for the ultrawide.
Why does the aspect ratio option say 43:18?
A 3440 x 1440 ultrawide is 43:18, which is what is marketed as 21:9.
Does this include the stand?
No. Check the full frame and stand width on the spec sheet before planning the desk.