Monitor scaling calculator
Scaling decides how big text looks. Resolution decides how sharply it is drawn. They are different questions, and pixel counts alone answer neither. Set your panel below and see the physical character size, the pixels behind each character, and the workspace you actually end up with.
Every scaling step on this panel
| Scaling | Character | Pixels | Grid | Reads as |
|---|---|---|---|---|
| 100% | 1.3 mm | 8.4 | 457 × 110 | small |
| 125% | 1.6 mm | 10.5 | 366 × 88 | slightly small |
| 150% (current) | 2.0 mm | 12.6 | 305 × 73 | comfortable |
| 175% | 2.3 mm | 14.7 | 261 × 63 | slightly large |
| 200% | 2.6 mm | 16.8 | 229 × 55 | large |
| 225% | 2.9 mm | 18.9 | 203 × 49 | large |
| 250% | 3.3 mm | 21.0 | 183 × 44 | large |
What each common panel wants
The scaling that puts a monospace character closest to 1.96 mm, with the grid you get at the nearest step your operating system offers:
| Panel | Density | Ideal | Nearest step | Character | Grid |
|---|---|---|---|---|---|
| 24 inch 1080p | 92 PPI | 84% | 100% | 2.32 mm | 229 × 55 |
| 27 inch 1440p | 109 PPI | 100% | 100% | 1.96 mm | 305 × 73 |
| 27 inch 4K | 163 PPI | 150% | 150% | 1.96 mm | 305 × 73 |
| 32 inch 1440p | 92 PPI | 84% | 100% | 2.32 mm | 305 × 73 |
| 32 inch 4K | 138 PPI | 126% | 125% | 1.94 mm | 366 × 88 |
| 27 inch 5K | 218 PPI | 200% | 200% | 1.96 mm | 305 × 73 |
Size and sharpness are not the same question
Two panels can show text at an identical physical size and look completely different. A 27 inch 1440p panel at 100% and a 27 inch 4K panel at 150% produce the same character size and the same 305 × 73 grid — but the 4K panel puts half again as many real pixels behind every glyph. That is the whole of what 4K buys at this size: not more room, better drawing. Arguments about scaling usually founder because the two are discussed as one thing.
Common questions
Should a 27 inch 4K monitor run at 125% or 150%?
150%. At 100% a 27 inch 4K panel renders a monospace character about 1.31 mm wide, which is small enough to strain most people at a normal desk distance. 150% brings it to roughly 1.96 mm — the same physical character size a 27 inch 1440p panel gives at 100%, which is the size most people settle on — while keeping about 12.6 device pixels behind every character instead of 8.4. 125% lands at about 1.63 mm, noticeably smaller than comfortable. The maths puts the exact ideal at 150% for this panel, which is why it is the near-universal recommendation.
Does scaling lose me screen space?
It trades pixels for size, not space in the abstract. A 27 inch 4K panel at 150% gives exactly the same usable grid as a 27 inch 1440p panel at 100% — the same number of columns and lines, because the effective resolution is the same 2560 × 1440. What the 4K panel adds is sharpness: half again as many real pixels rendering each character. You are not losing workspace by scaling up, you are spending the extra pixels on clarity rather than on more, smaller content.
Why does this calculator sometimes want less than 100%?
Because the panel is below the density where a comfortable character size and a sharp one coincide. A 24 inch 1080p or a 32 inch 1440p panel has roughly 92 PPI, so at 100% a character is already larger than the comfortable target and there are only about 8.4 pixels drawing it. Operating systems do not scale below 100% usefully, so 100% is the floor — the calculator is telling you the panel is low density, not that you should shrink it.
What is a comfortable character size?
About 1.96 mm wide for a monospace character, measured physically rather than in pixels. That is what a 27 inch 1440p panel produces at 100% scaling, and it is the size most people arrive at independently across very different panels. Fixing that physical size and then asking how many pixels are available to draw it is the useful way round — it separates how big text looks from how sharp it is, which pixel counts alone cannot do.
How many pixels does a character need to look sharp?
Roughly 8 or more real device pixels across, at your chosen physical text size. A 27 inch 1440p panel at 100% delivers almost exactly that, which is why it reads acceptably but not crisply. A 27 inch 4K at 150% delivers about 12.6, and a 5K at 200% about 16.8 — the point at which individual pixels stop being resolvable at a desk distance.