Aspect Ratio Calculator
Find the aspect ratio of any reference or canvas, then resize dimensions while keeping proportions perfect.
Enter Your Dimensions
Common presets:
Your Aspect Ratio
Simplified Ratio
16:9
Decimal Ratio
1.778
Orientation
Landscape
Dimensions
1920 × 1080
Resize While Keeping Ratio
About This Tool
Matching aspect ratio between your reference photo and canvas is critical for the grid method. If ratios differ, proportions stretch or compress — ruining an otherwise accurate drawing.
Enter pixel dimensions or use presets for common formats like 16:9, 4:3, 3:2, and golden ratio. Lock ratio when resizing to calculate paired dimensions instantly.
Key Benefits
- Artist Presets
Common photo, canvas, and print ratios built in.
- Proportional Resize
Change width or height — the other dimension updates automatically.
Related Tools
How It Works
Enter Dimensions
Type width and height, or pick a common preset.
Read Your Ratio
See simplified ratio, decimal value, and orientation.
Resize Proportionally
Enter a new width or height to calculate matching dimensions.
Frequently Asked Questions
What is an aspect ratio?+
Aspect ratio is the proportional relationship between width and height, like 16:9 or 4:3.
Why does aspect ratio matter for artists?+
Matching reference and canvas aspect ratio prevents distortion when using the grid method.
How do I resize while keeping the same ratio?+
Enable lock and enter either a new width or height — the other dimension calculates automatically.