Screen Size Calculator
- 24" FHD (92 PPI) — 60cm+ desk
- 27" QHD (109 PPI) — sweet spot
- 27" 4K (163 PPI) — Retina, needs scaling
- 32" 4K (138 PPI) — big & sharp balance
Professional Size Calculator
Live calculation
PPI, physical dimensions, area and clarity rating update as you type.
Overlay compare
Stack up to three monitor rectangles to see size differences visually.
One-click presets
Chips for 24/27/32/34 ultrawide fill all parameters instantly.
PPI Basics
PPI formula
PPI = √(w²+h²) ÷ diagonal inches — the core pixel density metric.
Retina distance
Apple threshold where pixels become indistinguishable at normal distance — ~110+ PPI at desk.
Scaling match
High-PPI screens need OS scaling: 163 PPI → 150%, 218 PPI → 200%.
How to Use
Enter specs
Fill diagonal and resolution, or use a preset chip.
Read results
PPI, physical size, area and rating update live.
Compare
Click "Add to compare" to pin the current spec and overlay the next one.
Golden Combos
24" FHD
92 PPI
- + Cheap
- + No scaling
- − Average sharpness
27" QHD
109 PPI
- + Sweet spot
- + No scaling
- − 4K content downsamples
27" 4K
163 PPI
- + Ultra sharp
- − Needs 150% scaling
34" UW QHD
110 PPI
- + Wide office view
- − Game compatibility
Buying Advice
At 60-70cm desk distance, 90-140 PPI balances price and sharpness.
Choose 3440×1440 ultrawides; 2560×1080 has visibly low PPI.
TV size by distance: 55" for 2-2.5m, 65" for 2.5-3m.
Prefer higher resolution at the same size — scaling beats native low-res.
FAQ
Calculation Notes
- Physical size = active area, bezels excluded
- Area computed as rectangle; curved differs slightly
- PPI is native panel value, independent of scaling
- Comparison persists for the session only
Related Tools
Pair with the Test Wizard for new monitors
Join the Wizard →