Example: A: 3 · B: 4 · Scale to new A (solve A:B = newA:x): 9 → Simplified ratio: 3 : 4.
x (so that 9:x matches): 12
As decimal: 0.75
Frequently asked questions
How do I calculate ratio? Enter your numbers above and the result updates instantly. For example: A: 3 · B: 4 · Scale to new A (solve A:B = newA:x): 9 → Simplified ratio: 3 : 4.
Is this Ratio Calculator free? Yes — completely free with no sign-up or paywall. It runs entirely in your browser and keeps working offline; the numbers you enter never leave your device.
How accurate is it? It uses the standard published formula for ratio. Results are estimates for planning — not financial, tax, medical, engineering, or legal advice.