What Is Ratio Calculator?
A free online ratio calculator. Simplify any ratio to its lowest terms, scale a ratio by setting one side to a target value, and view percentage breakdowns, decimal equivalents, and common aspect ratio presets.
Why Use Ratio Calculator?
- Ratio simplification with GCD display
- Scale to any target value on either side
- Aspect ratio presets (16:9, 4:3, 21:9, etc.)
- Percentage and decimal breakdowns
How to Use Ratio Calculator — Step by Step
1
Enter the two values of your ratio (e.g. 16 and 9).
2
View the simplified ratio and GCD.
3
Set a target value for either side to scale the ratio proportionally.
4
Use the common aspect ratio presets for quick reference.
Who Is Ratio Calculator Best For?
- screen dimensions
- photo cropping
- recipe scaling
- design layouts
Ratio Calculator — Frequently Asked Questions
What does simplifying a ratio do?
Simplifying divides both sides by their greatest common divisor (GCD), showing the ratio in its smallest integer form.
Can I scale a ratio up?
Yes. Enter a target value for either side A or B, and the tool will calculate the matching value while preserving the ratio.
Ready to Use Ratio Calculator?
Free online tool — works in your browser, no sign-up required. Start using it right now.
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