Screen Size Calculator – Diagonal, Width, Height
Calculate screen dimensions from diagonal size and aspect ratio.
About This Calculator
Calculate screen dimensions from diagonal size and aspect ratio. Use the calculator above for instant results.
Worked Examples
- Width: 23.53" | Height: 13.24" | Area: 311.6 sq in
Answer: 23.53" × 13.24"
- Width: 47.95" | Height: 26.97"
Answer: 47.95" × 26.97"
- Width: 20.33" | Height: 12.71"
Answer: 20.33" × 12.71"
Who Uses This Calculator?
Check monitor dimensions before buying.
Understand TV physical dimensions.
Plan projector screen sizing.
Spec workstation displays.
Common Mistakes to Avoid
❌ Diagonal doesn't tell you width
A 27" 16:9 monitor is 23.5" wide. A 27" 21:9 ultrawide is 25.1" wide. Aspect ratio changes physical dimensions significantly.
❌ Curved vs flat area
Same diagonal size on curved screens has slightly different viewing angles. The area formula is the same.
Frequently Asked Questions
Common aspect ratios?
16:9 (most monitors/TVs). 21:9 (ultrawide). 32:9 (super ultrawide). 4:3 (old standard). 16:10 (some laptops/monitors).
TV size guide?
Living room 10-12ft away: 55-65". Bedroom 6-8ft: 40-50". Monitor desk use: 24-32".
Physical size vs resolution?
A 27" 4K monitor has the same physical size as a 27" 1080p monitor but 4× more pixels.