Canvas aspect ratio calculator
Set one canvas side in pixels — see the other dimension for common ratios: square, 4:3, 16:9, A4, Instagram 4:5, and YouTube thumbnails.
Calculator form
How to use
Set a base side
Enter width or height in pixels as in your art app.
Pick the base mode
“From width” or “From height” locks the dimension you entered.
Compare formats
The table lists pixel pairs for each standard ratio.
Create the canvas
Copy the pair into CSP, Procreate, or Photoshop.
Sample calculations
Width 1920 px
16:9 → 1920 × 1080; 4:3 → 1920 × 1440
IG square
2000 px → 1:1 = 2000 × 2000
Vertical 4:5
2000 px width → 2000 × 2500 for Instagram feed
Common mistakes
Mistake
Cropping finished art to fit → Plan the ratio before drawing or leave margin on edges.
Mistake
Mixing up 16:9 and 9:16 → Horizontal for YouTube; vertical for Stories and Reels.
Mistake
Ignoring safe zones → Keep key detail centered — previews crop edges.
FAQ
What ratio is A4?
A4 uses 210:297 (√2), not screen 4:3.
What for ArtStation?
Often 16:9 or 3:2; avoid shrinking below ~1920 px wide.
Works for anime banners?
Yes — use 16:9 or the platform’s stated size.
Pixel rounding?
Fractional pixels round to integers — normal for digital art.
Do I need DPI?
For screen, pixels are enough; add DPI only for print.
Source: Instagram help: media sizes
Lock it in with practice
Open the free editor and apply the result — a short sketch beats more reading.