Ratio Calculator
Calculate the ratio between two numbers and the equivalent percentage.
Formulas
Generic ratio computation. Pure arithmetic, no jurisdiction dependency.
ratio = numerator / denominator; percentage = ratio * 100
Assumptions and limitations
Scope
Calculate the decimal ratio between two numbers through direct division. Applicable to proportions, indices, scaling factors, fractions and measurement ratios in any domain.
Assumptions
- Generic ratio computation. Pure arithmetic, no jurisdiction dependency.
Limitations
- Il Denominatore non può essere zero (divisione non definita)
- Non gestisce unità di misura eterogenee: il risultato è privo di unità
- Non calcola la percentuale equivalente (moltiplica per 100 per ottenerla)
Validation
Approach: Validated by verifying the declared formula and plausibility checks (range, units, edge cases).
Examples
Recipe scaling
- Rapporto = 6/4 = 1,5. Per servire 6 persone invece di 4, moltiplica ogni ingrediente per 1,5. Es.: 200g di farina → 300g.
Cost/revenue ratio
- Rapporto = 0,7. Il costo è il 70% del ricavo; margine lordo = 30%. Utile per analisi di redditività rapida.
Frequently asked questions
How do I use the ratio to scale a recipe?
Enter the target quantity as Numerator and the original quantity as Denominator. The resulting ratio is the scaling factor to apply to all ingredients. E.g.: from 4 people to 6 → ratio = 6/4 = 1.5. Multiply each ingredient by 1.5.
What's the difference between ratio and percentage?
The ratio is a pure division (3:4 = 0.75). The percentage is a ratio multiplied by 100 (0.75 × 100 = 75%). The ratio is more useful for direct proportions and scaling factors; the percentage for communicating shares intuitively.
The result shows 'infinity' or an error: what happened?
The Denominator is zero or has not been entered. Division by zero is not mathematically defined. Check that the Denominator field contains a numeric value other than zero.