Multi-monitor calculator
Total width, height and desk space for a multi-monitor setup, from the number, size and aspect ratio of the screens.
Multi-monitor setup result
Total width
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- Total width (cm)
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- Height per screen
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- Recommended desk width
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How it works
A multi-monitor setup combines several displays into one wider desktop workspace. This calculator finds the combined width and a comfortable desk width from the number, size, aspect ratio and bezel gap of the individual monitors, assuming they are placed side by side in a flat row.
- Choose the monitor count
2 for productivity, 3 or more for a wraparound or gaming setup.
- Enter the size and ratio
The calculator assumes every monitor is the same size and ratio.
- Add the bezel gap
Modern thin-bezel monitors add only 5 to 10mm per join; leave it at 0 to ignore it.
The width formula
Each monitor's width and height come from its diagonal and aspect ratio, then the widths add up across the row:
Width per screen = Diagonal × ratioW ÷ √(ratioW² + ratioH²)
Two 27-inch 16:9 monitors are 23.5 inches wide each, for a total of 47.1 inches (119.6cm) with no bezel gap. The recommended desk width rounds that up and adds 10cm of working margin, so you are not forced to sit with your keyboard against the monitor stands.
Planning the desk
- Bezel gap: thin-bezel monitors typically add 5 to 10mm at each join. Include it if you want an exact number for buying a desk.
- GPU requirements: more monitors and higher resolutions need more GPU power. Three 1440p monitors need less VRAM than a single 4K display but more total shading work.
- Mounting: dual and triple monitor arms save desk depth and add tilt and height adjustment. Check the weight limit and VESA compatibility before buying.
- Matching monitors: mixing different resolutions can cause scaling and alignment issues. For the smoothest result, use identical monitors or match the pixel density (PPI) across them.
Assumes identical, flat monitors
This calculator assumes every monitor is the same size and ratio, arranged in a flat row. A curved or angled arrangement, or mixed monitor sizes, will use less linear desk width than shown here.
Frequently asked questions
What GPU VRAM is needed for a triple 4K monitor setup?
Each 4K display (3840×2160) adds roughly 32MB of framebuffer per frame at 8-bit color, so three 4K displays at 60Hz use about 100MB of VRAM for framebuffers alone, negligible next to game texture demands. The real constraint is rendering power: three 4K displays triple the shading workload. For desktop productivity, 8 to 12GB VRAM is enough; for 4K gaming across three screens, 16 to 24GB and a flagship GPU are needed.
How many monitors can I run from a single GPU?
Most modern consumer GPUs support 4 simultaneous displays; professional cards support up to 6 to 8. DisplayPort 1.4 Multi-Stream Transport (MST) allows daisy-chaining up to 4 monitors through a single DP output with a sufficiently high-bandwidth hub. Practical limits come from the physical ports available and the total bandwidth shared across all connected displays.
Can I mix monitors with different resolutions and refresh rates?
Technically yes, but with caveats. Windows and macOS allow mixed-resolution setups, though some applications and games handle them poorly and fullscreen may not stretch correctly across mismatched panels. Mixed refresh rates work, but variable refresh rate only activates on the display actually rendering the content. Matching resolutions and refresh rates gives the smoothest experience.
Is the bezel gap a problem for multi-monitor gaming?
For games that span multiple monitors, bezel gaps interrupt the image: objects crossing the boundary between screens appear split by the bezel thickness. Thin-bezel monitors, with a frame under 5mm, minimize this. Bezel correction settings compensate by adding virtual pixels where the bezels sit, slightly expanding the combined resolution to preserve alignment.
How much desk width do I actually need for 3 monitors?
Three 24-inch 16:9 monitors are about 20.9 inches wide each, 62.7 inches (159cm) total with no bezel gap. Add roughly 10cm of working margin, and a 170cm or wider desk is comfortable. Curving the outer monitors inward, rather than a flat row, reduces the linear desk width needed for the same viewing coverage.