38" 21:9 vs 40" 21:9 Monitor — 11% Bigger (Visual Comparison)

Choosing between a 38" and 40" monitor? Overlay them at real scale — the 40" has 11% more screen area (36.8" × 15.8" vs 34.9" × 15"). Free tool, no signup.

38" 21:9 measures 34.9" wide × 15" tall (523.5 sq in of screen area). 40" 21:9 measures 36.8" wide × 15.8" tall (581.4 sq in). The 40" 21:9 has 11% more screen area than the 38" 21:9.

At a typical desk distance of 24–30", the 40" monitor subtends roughly 46° of horizontal field of view vs 44° for the 38" — a noticeable difference for productivity and immersion. For 4K at 40", pixel density is 110 PPI — comfortably sharp at arm's length.

Quick Comparison Facts

11%

More screen area

34.9" × 15"

38" 21:9 (W×H)

36.8" × 15.8"

40" 21:9 (W×H)

523.5 vs 581.4

Area (sq in)

Display 1

Aspect ratio

Size

Orientation

Display 2

Aspect ratio

Size

Orientation

Size Comparison

Display 1: 38in 21x9 (horizontal)

Display 2: 40in 21x9 (horizontal)

Comparison Details

Display 1

38in diagonal

34.9" × 15" (W×H)

523.5 sq in area

21:9 · ~98 PPI (1440p UW)

Difference

11%

area difference

diagonal difference

Display 2

40in diagonal

36.8" × 15.8" (W×H)

581.4 sq in area

21:9 · ~93 PPI (1440p UW)

Check exact PPI & sharpness for your desk depth →

Which Size Should You Choose?

Choose the 38" 21:9 if:

You have a standard-depth desk (24" or less)
You primarily do single-app focused work
You prefer higher pixel density at closer distances
Budget or desk space is limited

Choose the 40" 21:9 if:

You multitask with side-by-side windows
You work with large spreadsheets, timelines, or code
Gaming immersion is important to you
You have a deeper desk (28"+ recommended)

38" 21:9 vs 40" 21:9: Detailed Specifications

Specification	38" 21:9	40" 21:9
Screen diagonal	38"	40"
Width	34.9"	36.8"
Height	15"	15.8"
Screen area	523.5 sq in	581.4 sq in
1080p pixel density	58 PPI	55 PPI
4K pixel density	116 PPI	110 PPI

The 40" 21:9 has 11% more screen area than the 38" 21:9. In practice, this means the 40" 21:9 (36.8" wide) extends 1.9" further across and 0.8" taller than the 38" 21:9.

At a typical desk distance of 24 inches, a 38" monitor with 1080p resolution delivers 58 PPI, while the 40" at the same resolution drops to 55 PPI. That's a noticeable sharpness difference — 38" 1080p looks cleaner for text-heavy work. However, with a 1440p or 4K panel, the 40" actually becomes the better choice for multitasking and creative work, providing 1.9" extra horizontal space without sacrificing pixel density.

Use the interactive tool above to visualize exactly how these sizes compare on your screen. You can also adjust the aspect ratio and orientation to match your specific device.

Frequently Asked Questions

How much bigger is a 40" 21:9 display than a 38" 21:9?

A 40" 21:9 display has 11% more screen area than a 38" 21:9. The 38" 21:9 measures 34.9" × 15" (523.5 sq in) while the 40" 21:9 measures 36.8" × 15.8" (581.4 sq in).

What are the exact dimensions of a 40" 21:9 display?

A 40" 21:9 display measures 36.8 inches wide by 15.8 inches tall, giving a total viewing area of 581.4 square inches.

Is a 40" monitor too big for a desk?

A 40" monitor works well on desks with 28"+ depth from your seated position to the screen. At the standard 24" desk depth, a 38" monitor is often more comfortable for all-day use without neck movement to see corners.